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Plasmonics and Nanophotonics Studies by Koichi Okamoto
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Publication list

 

Journal Papers

(68). Electromagnetically induced transparency of a plasmonic metamaterial light absorber based on multilayered metallic nanoparticle sheet

K. Okamoto, D. Tanaka, R. Degawa, X. Li, P. Wang, S. Ryuzaki, and K. Tamada

Scientific Reports 6, Article number: 36165 (2016)Link 


(67). Fabrication and unique optical properties of two-dimensional silver nanorod arrays with nanometer gaps on a silicon substrate from a self-assembled template of diblock copolymer

S. Fujikawa, M. Koizumi, A. Taino, K. Okamoto

Langmuir, Vol. 32, No. 47, pp 8154-8162 (2016)Link 


(66). Colorimetric detection of an airborne remote photocatalytic reaction using a stratified Ag nanoparticle Sheet

R. Degawa, P. Wang, D. Tanaka, S. Park, N. Sakai, T. Tatsuma, K. Okamoto, and K. Tamada

Langmuir, Vol. 32, No. 32, pp 12504–12510(2016)Link 


(65). Exciton–plasmon coupling and electromagnetically induced transparency in monolayer semiconductors hybridized with Ag nanoparticles

W. Zhao, S. Wang, B. Liu, I. Verzhbitskiy, S. Li, F. Giustiniano, D. Kozawa, K.-P. Loh, K. Matsuda, K. Okamoto, . F. Oulton, G. Eda

Advanced Materials. Vol. 28, No. 14, p.p. 2709–2715 (2016). Link


(64). Silver nanoparticles with tunable work functions

P. Wang, D. Tanaka, S. Ryuzaki, S. Araki, K. Okamoto and K. Tamada

Applied Physics Letters, Vol. 107, 151601 (2015). Link


(63). Characteristics of localized surface plasmons excited on mixed monolayers composed of self-assembled Ag and Au nanoparticles

D. Tanaka, K. Imazu, J. Sung, C. Park, K. Okamoto, and K. Tamada

Nanoscale. Vol. 7, p.p. 15310-15320 (2015). Link


(62). Colorimetric plasmon sensors with multilayered metallic nanoparticle sheets

S. Shinohara, D. Tanaka, K. Okamoto and K. Tamada

Phys.Chem.Chem.Phys. Vol. 17, p.p. 18606-18612 (2015). (pdf 1980KB)


(61). Highly enhanced green emission from InGaN quantum wells due to surface plasmon resonance on aluminum films

K. Tateishi, M. Funato, Y. Kawakami, K. Okamoto and K. Tamada

Applied Physics Letters, Vol. 106, 121112 (2015). (pdf 1130KB)


(60). Tuning the work function of two-dimension silver nanoparticle sheets using local oxidation nanolithography

P.-P. Wang, K. Okamoto, and K. Tamada

Advanced Materials Interfaces, DOI: 10.1002/admi.201400268 (2014). (pdf 1590KB)


(59). Highly confined, enhanced surface fluorescence imaging with 2 two-dimensional silver nanoparticle sheets

E. Usukura, S. Shinohara, K. Okamoto, J. Lim, K. Char, and K. Tamada

Applied Physics Letters, Vol. 104, 121906 (2014). (pdf 1480KB)

 

(58). High-sensitivity surface plasmon resonance sensors utilizing high-refractive-index silver nanoparticle sheets

D. Tanaka, S. Shinohara, E. Usukura, P. Wang, K. Okamoto, and K. Tamada

Japanese Journal of Applied Physics, Vol. 53, pp. 01AF01-01AF07 (2014). (pdf 1820KB)

 

(57). Perfect blackbody radiation from a graphene nanostructure with application to hightemperature spectral emissivity measurements

T. Matsumoto, T. Koizumi, Y. Kawakami, K. Okamoto, M. Tomita

Optics Express Vol. 21, No. 25, pp. 30964-30974 (2013), (pdf 2050KB)

 

(56). Tuning colors of silver nanoparticle sheets by multilayered crystalline structures on metal substrates

K. Okamoto, B. Lin, K. Imazu, A. Yoshida, K. Toma, M. Toma, and K. Tamada

Plasmonics, Vol. 8, pp. 581-590 (2013). (pdf 1150KB)

 

(55). Grain size dependence of surface plasmon enhanced photoluminescence

X.-Y. Xu, M. Funato, Y. Kawakami, K. Okamoto, and K. Tamada

Optics Express, Vol. 21, No. 3, pp. 3145-3151 (2013). (pdf 1202KB)

 

(54). Spectroscopic properties of multilayered gold nanoparticle 2D shee

A. Yoshida, K. Imazu, X.-H. Li, K. Okamoto, and K. Tamada

Langmuir, Vol. 28, No. 49, pp. 17153-17158 (2012).  (pdf 499KB)

 

(53). Interference of the surface plasmon polaritons with an Ag waveguide probed by dual-probe scanning near-field optical microscopy

R. Fujimoto, A. Kaneta, K. Okamoto, M. Funato, Y. Kawakami

Applied Surface Science, Vol. 258, pp. 7372-7376  (2012).  (pdf 949KB)

 

(52). Single mode emission and non-stochastic laser system based on disordered point-sized structures: toward a tuneable random laser

R. Bardoux, A. Kaneta, M. Funato, K. Okamoto, Y. Kawakami, A. Kikuchi, and K. Kishino

Optics Express, Vol. 19, No. 10, pp. 9262-9268 (2011). (pdf 1210KB)

 

(51). Collective plasmon modes excited on a silver nanoparticle 2D crystalline sheet

M. Toma, K. Toma, K. Michioka, Y. Ikezoe, D. Obara, K. Okamoto, and K. Tamada

Physical Chemistry Chemical Physics, Vol. 13, pp. 7459-7466 (2011). (pdf 2860KB)

 

(50). Enhancements of emission rates and efficiencies by surface plasmon coupling

K. Okamoto, and Y. Kawakami

Physica Status Solidi C, Vol. 7, No. 10, pp. 2582-2585 (2010). (pdf 527KB)

  

(49). Optical properties of InGaN/GaN nanopillars fabricated by postgrowth chemically assisted ion beam etching

Y. Kawakami, A. Kaneta, L. Su, Y. Zhu, K. Okamoto, M. Funato, A. Kikuchi, and K. Kishino

Journal of Applied Physics, Vol. 107, No. 4, Art. No. 023522 (2010). (pdf 466KB)

 

(48). (Invited paper) High-Efficiency InGaN/GaN light emitters based on nanophotonics and plasmonics

K. Okamoto, and Y. Kawakami
IEEE Journal of Selected Topics in Quantum Electronics, Vol. 15, No. 2, pp. 1190-1209 (2009) (pdf 1517KB)
 
(47). Diffusion of gold ions and gold particles during photoreduction processes probed by the transient grating method
M. Harada, K. Okamoto, and M. Terazima
The Journal of Colloid & Interface Science, Vol 332, No. 2, pp. 373-381 (2009) (pdf 404KB)
 
(46). Surface plasmon enhanced light emission from semiconduc-tor materials
K. Okamoto, A. Scherer, and Y. Kawakami
Physica Status Solidi (c), Vol. 5, No. 9, pp. 2822-2824 (2008). (pdf 150KB)
 
(45). Surface plasmon enhanced bright light emission from InGaN/GaN
K. Okamoto, I. Niki, A. Shvartser, G. Maltezos, Y. Narukawa, T. Mukai, Y. Kawakami, A. Scherer
Physica Status Solidi (a), Vol. 204, No. 6, pp. 2103-2107 (2007). (pdf 161KB)

(44). Time-resolved photoluminescence spectroscopy of surface-plasmon-enhanced light emission from conjugate polymers
T. D. Neal, K. Okamoto, A. Scherer, M. S. Liu, A. K-Y Jen
Applied Physics Letters, Vol. 89, Art. No. 221106 (2006). (pdf 165KB)

(43). Ultralow threshold on-chip toroidal microcavity nanocrystal quantum dot lasers
B. Min, S. Kim, K. Okamoto, L. Yang, A. Scherer, H. Atwater, K. Vahala
Applied Physics Letters, Vol. 89, Art. No. 191124 (2006). (pdf 529KB)

(42). Diffusion of the Platinum ions and platinum nanoparticles during the photo-reduction processes using the transient grating method
M. Harada, K. Okamoto, M. Terazima
Langmuir, Vol. 22, No. 22, pp. 9142-9194 (2006). (pdf 278KB)

(41). Surface plasmon enhanced bright emission from CdSe quantum dots nanocrystal
K. Okamoto, S. Vyawahare, A. Scherer
Journal of the Optical Society of America B, Vol. 23, No. 8, pp. 1674-1678 (2006). (pdf 300KB)

(40). Electrochemical conditions for the synthesis of Cu2O nanowires in alumina template
E. Ko, J. Choi, K. Okamoto, Y. Taka, J. Lee
ChemPhysChem, Vol. 7, No. 7, pp. 1505-1509 (2006). (pdf 232KB)

(39). Near-field scanning optical microscopic transient lens for carrier dynamics study in InGaN/GaN
K. Okamoto, A. Scherer, Y. Kawakami
Applied Physics Letters, Vol. 87, Art. No. 161104 (2005). (pdf 322KB)
---> highlighted at Editors’ Choice, Science Vol.310, p.591 (2005)

(38). Confocal micro-photoluminescence of InGaN-based light emitting diodes
K. Okamoto, A. Kaneta, Y. Kawakami, S. Fujita, J. Choi, M. Terazima, T. Mukai
Journal of Applied Physics, Vol. 98, Art. No. 064503 (2005). (pdf 720KB)

(37). Molecular dynamics study of photochromic molecules probed by the mask pattern transferred transient grating technique
K. Okamoto, T. D. Neal, Z. Zhang, D. T. Wei, A. Scherer
Chemical Physics Letters, Vol. 414, pp. 155-160 (2005). (pdf 218KB)

(36). Surface plasmon enhanced spontaneous emission rate of InGaN/GaN quantum wells probed by time-resolved photoluminescence spectroscopy
K. Okamoto, I. Niki, A. Scherer, Y. Narukawa, T. Mukai, Y. Kawakami
Applied Physics Letters, Vol. 87, Art. No. 071102 (2005). (pdf 364KB)

(35). Surface plasmon enhanced emission from dye doped polymer layers
T. D. Neal, K. Okamoto, A. Scherer
Optics Express, Vol. 13, No. 14, pp. 5522-5527 (2005). (pdf 118KB)
---> highlighted at Laser Focus World, September 2005, p. 36

(34). Surface plasmon enhanced super bright InGaN light emitter
K. Okamoto, I. Niki, A. Shvartser, Y. Narukawa, T. Mukai, and A. Scherer
Physica Status Solidi (c), Vol. 2, No. 7, pp. 2841-2844 (2005). (pdf 104KB)

(33). Mask pattern transferred transient grating technique for molecular dynamics study in solutions
K. Okamoto, Z. Zhang, D. T. Wei, and A. Scherer
Applied Physics Letters, Vol. 85, No. 21, pp. 4842-4844 (2004). (pdf 207KB)

(32). Surface plasmon enhanced light-emitters based on InGaN quantum wells
K. Okamoto, I. Niki, A. Shvartser, Y. Narukawa, T. Mukai, and A. Scherer
Nature Materials, Vol. 3, No. 9, pp. 601–605 (2004). (pdf 372KB)
---> highlighted at Photonics Spectra, December 2004, p. 105

(31). Photothermal molecular sensing by using metal thin-film nano grating for chemical and biomedical applications
K. Okamoto, Z. Zhang, D. T. Wei, and A. Scherer
Thin Solid Films, Vol. 469-470, pp. 420-424 (2004). (pdf 332KB)

(30). Submicron-scale photoluminescence of InGaN/GaN probed by confocal scanning laser microscopy
K. Okamoto, J. Choi, Y. Kawakami, M. Terazima, T. Mukai, and S. Fujita
Japanese Journal of Applied Physics, Vol. 43, No. 2, pp. 839-840 (2004). (pdf 128KB)

(29). Photonic crystal nanolasers (I): Porous cavity lasers
M. Lončar, T. Yoshie, K. Okamoto, Y. Qiu, J. Vučković, A. Scherer
IEICE Transaction on Electronics, Vol. E87-C, No. 3, pp. 291-299 (2004). (pdf 1430KB)

(28). Sub-microscopic transient lens spectroscopy of InGaN/GaN quantum wells
K. Okamoto, S. Fujita, Y. Kawakami, A. Scherer
Physica Status Solidi (b), Vol. 240, No. 2, pp. 368-371 (2003). (pdf 309KB)

(27). Recombination dynamics in low-dimensional nitride semiconductors
Y. Kawakami, A. Kaneta, K Omae, A. Shikanai, K. Okamoto, G. Marutsuki, Y. Narukawa, T. Mukai, S. Fujita
Physica Status Solidi (b), Vol. 240, No. 2, pp. 337-343 (2003). (pdf 460KB)

(26). Near-field scanning optical microscopy of photonic crystal nanocavities
K. Okamoto, M. Lončar, T. Yoshie, A. Scherer, Y. Qui, P. Gogna,
Applied Physics Letters, Vol. 82, No. 10, pp. 1676-1678 (2003). (pdf 328KB)

(25). Contribution of hydrogen bonding to the slow diffusion of transient radicals
K. Okamoto, Y. Nogami, T. Tominaga, M. Terazima
Chemical Physics Letters, Vol. 372, pp. 419-422 (2003). (pdf PDF 155KB)

(24). Photonic crystal nanocavities for efficient light confinement and emission
A. Scherer, T. Yoshie, M. Lončar, J. Vučković, K. Okamoto, D. Deppe
Journal of the Korean Physical Society, Vol 42, pp. S768-S773 (2003). (pdf 585KB)

(23). Nonradiative recombination processes of carriers in InGaN/GaN probed by the microscopic transient lens spectroscopy
K. Okamoto, K. Inoue, Y. Kawakami, Sg. Fujita, M. Terazima, A. Tsujimura, I. Kidoguchi
Review of Scientific Instruments, Vol. 74, No. 1, pp. 575-577 (2003). (pdf 71.7KB)

(22). Spatial and temporal luminescence dynamics in an InxGa1-xN single quantum well probed by near field optical microscopy
A. Kaneta, K. Okamoto, Y. Kawakami, Sg. Fujita, G. marutsuki, Y. Narukawa, T. Mukai
Applied Physics Letters, Vol. 81, No. 23, pp. 4353-4355 (2002). (pdf 180KB)

(21). Erratum: ‘‘Narrow luminescence lines from self-assembled CdSe quantum dots at room temperature’’ [Appl. Phys. Lett. 78, 297 (2001)]
Z. H. Zheng, K. Okamoto, H. C. Ko, Y. Kawakami, Sg. Fujita
Applied Physics Letters, Vol. 78, No. 23, p. 3749 (2002). (pdf 10.4KB)

(20). Microscopic patterning on the polysilane films by the laser induced grating technique
K. Okamoto, T. Tojo, H. Tada, M. Terazima, K. Matsushige
Molecular Crystal and Liquid Crystals, 370, pp370-382 (2001). (pdf 155KB)

(19). Carrier dynamics in InGaN/GaN SQW structure probed by the transient grating method with subpicosecond pulsed laser
K. Okamoto, A. Kaneta, K. Inoue, Y. Kawakami, M. Terazima, T. Mukai, G. Shinomiya, Sg. Fujita
Physica Status Solidi B, Vol. 228, No. 1, pp. 81-84 (2001). (pdf 143KB)

(18). Spatial inhomogeneity of photoluminescence in InGaN single quantum well structures
A. Kaneta, G. Marutsuki, K. Okamoto, Y. Kawakami, Y. Nakagawa, G. Shinomiya, T. Mukai, Sg. Fujita
Physica Status Solidi B, Vol. 228, No. 1, pp. 153-1564 (2001). (pdf 249KB)

(17). In inhomogeneity and emission characteristics of InGaN
Y. Kawakami, K. Omae, A. Kaneta, K. Okamoto, Y. Narukawa, T. Mukai, Sg. Fujita
Journal of Physics: Condensed Matter, Vol. 13, pp. 6993-7010 (2001). (pdf 863KB)

(16). Spatial inhomogeneity of photoluminescence in an InGaN-based light-emitting diode structure probed by near-field optical microscopy under illumination-collection mode
A. Kaneta, T. Izumi, K. Okamoto, Y. Kawakami, Sg. Fujita, Y. Narita, T. Inoue, T. Mukai
Japanese Journal of Applied Physics, Vol. 40 pp. 110-111 (2001) (pdf 41.1KB)

(15). Radiative and nonradiative recombination processes in GaN-based semiconductors
Y. Kawakami, K. Omae, A. Kaneta, K. Okamoto, T. Izumi, S. Saijo, K. Inoue, Y. Narukawa, S. Nakamura, Sg. Fujita
Physica Status Solidi (a), Vol. 183, pp. 41-50 (2001) (pdf 208KB)

(14). Translational diffusion of ion radicals created by electron transfer in charged micellar solutions probed by the transient grating method and the Taylor dispersion method
K. Okamoto, N. Hirota, M. Terazima, T. Tominaga,
The Journal of Physical Chemistry A, Vol.105, No.27, pp. 6586-6593 (2001). (pdf 107KB)

(13). Photothermal processes of wide-bandgap semiconductors probed by the transient grating method
K. Okamoto, Y. Kawakami , Shigeo Fujita, M. Terazima
Analytical Science, Vol. 17, pp. s312-s314 (2001). (pdf 421KB)

(12). Time-space resolved photoluminescence from (Zn,Cd)Se -based quantum dots structures
K. Okamoto, H.-C. Ko, Y. Kawakami, Sg. Fujita
Journal of Crystal Growth, 214/215, pp. 639-645 (2000). (pdf 502KB)

(11). Time-resolved photoluminescence spectroscopy in GaN-based semiconductors with micron spatial resolution
T. Izumi, Y. Narukawa, K. Okamoto, Y. Kawakami , Shigeo Fujita, S. Nakamura
Journal of Luminescence, 87-89, pp. 1196-1198 (2000). (pdf 424KB)

(10). Diffusion of photochemically generated intermediate radicals in water-ethanol mixed solvents
K.Okamoto, N. Hirota, M. Terazima
The Journal of Physical Chemistry A, Vol.102, No.19 pp. 3447-3454 (1998). (pdf 104KB)

(9). Diffusion of electrically neutral radicals and anion radicals created by photochemical reactions
K. Okamoto, N. Hirota, M. Terazima
The Journal of Chemical Society Faraday Transaction, Vol.94, No.1 pp. 185-194 (1998). (pdf 337KB)

(8). Diffusion process of the benzyl radical created by photodissociation probed by the transient grating method
K. Okamoto, N. Hirota, M. Terazima
The Journal of Physical Chemistry A, Vol.101, No.29, pp. 5269-5277 (1997). (pdf 306KB)

(7). Diffusion of free radicals in solution. TEMPO, diphenylpicrylhydrazyl, and nitrosodisulfonate - Comment
K. Okamoto, N. Hirota, M. Terazima
The Journal of Physical Chemistry A, Vol.101, No.29, pp. 5380-5381 (1997). (pdf 52.8KB)

(6). Temperature dependence of diffusion of radical intermediates probed by the transient grating method
K. Okamoto, M. Terazima, N. Hirota
The Jounal of Chemical Physics, Vol.103, No.24, pp. 10445-10452 (1995). (pdf 169KB)

(5). Translational diffusion of transient radicals created by the photoinduced hydrogen abstraction reaction in solution: Anomalous size dependence in the radical diffusion
M. Terazima, K. Okamoto, N. Hirota
The Jounal of Chemical Physics, Vol.102, No.6, pp. 2506-2515 (1995). (pdf 249KB)

(4). Translational diffusion of transient radicals studied by the transient grating method
M. Terazima, K. Okamoto, N. Hirota
Journal of Molecular Liquids, Vol.65/66, pp. 401-404 (1995) (pdf 732KB)

(3). Molecular dynamics in solution probed by the transient grating method with a nanosecond pulsed Laser
M. Terazima, K. Okamoto, N. Hirota
Laser Chemistry, Vol.13, pp. 169-185 (1994) (pdf 3130KB)

(2). Transient radical diffusion in photoinduced hydrogen abstraction reactions of benzophenone probed by the transient grating method
M. Terazima, K. Okamoto, N. Hirota
The Journal of Physical Chemistry, Vol.97, No.50 pp. 13387-13393 (1993). (pdf 878KB)

(1). Diffusion process of methyl red in organic solvents studied by the transient grating method
M. Terazima, K. Okamoto, N. Hirota
The Journal of Physical Chemistry, Vol.97, No.19 pp. 5188-5192 (1993). (pdf 543KB)


Proceedings
(17). Nanostructure-controlled plasmonics towards high-efficiency light-emitting diodes and solar cells
K. Okamoto, Y. Kawakami
Renewable Energy 2010 Proceedings, O-Pv-1-3, (2010).(pdf 440KB)

(16). Enhanced light emission by exciton-surface plasmon coupling
K. Okamoto, A. Scherer, Y. Kawakami
Proceedongs of 2007 MRS Fall Meeting, 1055-GG05-03 (2008).(pdf 120KB)

(15). Surface plasmon enhanced InGaN light emitter
K. Okamoto, I. Niki, A. Shvartser, G. Maltezos, Y. Narukawa, T. Mukai, K. Nishizuka, Y. Kawakami, A. Scherer
Proceedongs of SPIE, vol 5733, pp94-103 (2005).
(pdf 489KB)

(14). Surface plasmon enhanced light emitting efficiencies of InGaN/GaN quantum wells
K. Okamoto, I. Niki, A. Shvartser, Y. Narukawa, T. Mukai, A. Scherer
Lasers and Electro-Optics, 2004. (CLEO). Conference on, Volume 1, 16-21 May 2004 Page(s):2 pp. vol.1 (2004) (pdf 118KB)
 
(13). Photonic crystal nanocavities with quantum well or quantum dot active material
T. Yoshie, M. Loncar, K. Okamoto, Y. Qiu; O. B. Shchekin,, H. Chen, D. G. Deppe, A. Scherer
Proceedongs of SPIE, vol 5360, pp16-23 (2004).
  
(12). Light concentration in photonic crystal and plasmon optical cavities
A. Scherer, M. Loncar, K. Okamoto, T. Yoshie, M. Adams, J. Witzens
Lasers and Electro-Optics Society, 2004. LEOS 2004. Vol. 2, pp. 815- 816 (2004)
(pdf 717KB)
 
(11). Near-field scanning optical microscopy of photonic crystal high-Q nanocavities
K. Okamoto, M. Lončar, T. Yoshie, A. Scherer, Y. Qui, P. Gogna,
Quantum Electronics and Laser Science, 2003. QELS. Postconference Digest, 1-6 June 2003 Page(s):2 pp. (2003) (pfd 253KB)
 
(10). Photonic bandgap microcavities and waveguides
A. Scherer, M. Loncar,, T. Yoshie, K. Okamoto, B. Maune, J. Witzens
SOI Conference, 2003. IEEE International, pp. 9- 11 (2003)
(pdf 257KB)

(9). Photonic bandgap microcavity devices
A. Scherer, M. Loncar,, T. Yoshie, K. Okamoto
Nanotechnology, 2003. IEEE-NANO 2003. Vol. 1 pp. 275- 276 (2003)
(pdf 206KB)

(8). 2-D photonic crystal microcavities
A. Scherer, T. Yoshie, M. Loncar,, J. Vuckovic, D. Deppe, K. Okamoto
2003 Digest of the LEOS Summer Topical Meetings. Page TuA3.1/47 (2003)
(pdf 108KB)

(7). Recombination mechanism in low-dimensional nitride semiconductors
Y. Kawakami, A. Kaneta, K. Okamoto, T. Inoue, F. Satou, Y. Narita, F. Henneberger, G. Marutsuki, Y. Narukawa, T. Mukai, S. Fujita
Proceedongs of SPIE, vol 4986, pp575-588 (2003).

(6). Direct observation of the nonradiative recombination processes in InGaN-based LEDs probed by the third-order nonlinear spectroscopy
K. Okamoto, S. Saijo, Y. Kawakami, Sg. Fujita, M. Terazima, T. Mukai, G. Shinomiya, S. Nakamura
Proceedongs of SPIE, vol 4278, pp150-157 (2001).
(pdf 477KB)

(5). Dynamics of spontaneous and stimulated emission in GaN-based semiconductors
Y. Kawakami, K. Omae, A. Kaneta, K. Okamoto, T. Izumi, S. Saijo, K. Inoue, Y. Narukawa, T. Mukai, Sg. Fujita
Proceedongs of SPIE, vol 4280, pp45-52 (2001).
(pdf 993KB)

(4). Time-resolved fluorescence spectroscopy of dopamine in the single cells
M. Mabuchi, J. Shimada, K. Okamoto, Y. Kawakami, Sg. Fujita, K. Matsushige,
Proceedongs of SPIE, vol 4252, pp140-147 (2001).
(pdf 222KB)

(3). Nonradiative recombination processes in GaN-based semiconductors probed by the transient grating method.
K. Okamoto, Y. Kawakami, Sg. Fujita, M. Terazima, S. Nakamura,
Proc. Int. Workshop on Nitride Semiconductors, IPAP Conf. Series 1 pp. 540-543 (2000).
(pdf 312KB)

(2). Recombination dynamics in GaN and InGaN/GaN multiple quantum wells on air-bridged lateral epitaxial grown GaN layers
T. Izumi, K. Inoue, Y. Narukawa, K. Okamoto, Y. Kawakami, Sg. Fujita, A. Tsujimura, I. Kidoguchi, Y. Ban
Proc. Int. Workshop on Nitride Semiconductors, IPAP Conf. Series 1 pp. 599-602 (2000).
(pdf 316KB)

(1). Postdoctoral scholars should do research with free style - In case of Kyoto University-Venture Business Laboratory -
ポストドク研究員だからこそできる自由な研究 -京都大学ベンチャービジネスラボラトリーにて-
岡本晃一 (K. Okamoto)
化学と工業 (Kagaku to Kogyo), Vol. 53, No. 7, pp. 798-800 (2000).
(pdf 794KB)


International Conference
(52). Surface plasmon enhanced light-emitting and light-receiving devices
K. Okamoto(Invited by Prof. J.-S. Cherng, Mingchi Univ. of Technology)
2009 Workshops on Nanotechnology and Solar Cells & Green Chemical Processes and Materials, Taipei, 2008
 
(51). Highly efficient light emission based on plasmonics
K. Okamoto, Y. Kawakami
2008 LEOS Annual Meeting , Newport Beach, CA, USA, 2008
 
(50). Highly efficient light emission based on plasmonics
K. Okamoto, Y. Kawakami, A. Scherer (Invited by Prof. M. Ohtsu, Univ. of Tokyo)
2008 Japan-US Nanophotonics Seminar, Miyazaki, Japan, 200
 
(49). Highly efficient light-emitting devices based on plasmonics
K. Okamoto, Y. Kawakami, A. Scherer
Gordon Research Conference on Plasmonics, Tilton, NH, USA, 2008
 
(48). Surface plasmon enhanced highly efficient light-emitting devices
K. Okamoto, A. Scherer, Y. Kawakami (Invited by Prof. M.Z.A. Yahya (Univ. Teknologi MARA) and A.K. Arof (Univ. of Malasya)
2nd International Conference on Functional Materials and Devices 2008, Kuala Lumpur, Malaysia, Jun. 2008
 
(47). Surface plasmon enhanced super bright solid-state light-emitting devices
K. Okamoto, Y. Kawakami, A. Scherer (Invited by Prof. A. Neogi, Univ. of North Texas)
JSPS – UNT Winterschool on Nanophotonics, University of North Texas, Denton, USA, 2008

  
(46). Highly efficient light emission based on surface plasmon coupling
K. Okamoto (Invited by Prof. H. Misawa and K. Sasaki, Hokkaido Univ.)
9th RIES-Hokudai International Symposium, Hokkaido University, Sapporo, Japan, 2008
 
(45). Enhanced light emission by exciton-surface plasmon coupling
K. Okamoto, Y. Kawakami, A. Scherer
2007 Material Research Society (MRS) Fall Meeting, Boston, USA, 2007

(44). Surface plasmon enhanced light emission from semiconductor materials
K. Okamoto, Y. Kawakami, A. Scherer
The 34th International Symposium on Compound Semiconductors (iscs2007), Kyoto, Japan, 2007
 
(43). Development and Characterization of Novel Optical Devices based on Nanophotonics and Plasmonics
K. Okamoto(Invited by Prof. E. T. Yu, UCSD)
UCSD Electrical & Computer Engineering Special Seminar, University of California San Diego, USA, 2007

(42). Surface plasmon enhanced light emission
K. Okamoto (Invited by Prof. Y. Kawakami, Kyoto Univ.)
Focused Session in International Workshop on Nitride Semiconductors (IWN2006), Kyoto Univ., Japan, 2006

(41). Surface plasmon enhanced bright light emission from InGaN/GaN
K. Okamoto, I. Niki, A. Shvartser, G. Maltezos, Y. Narukawa, T. Mukai, Y. Kawakami, A. Scherer
International Workshop on Nitride Semiconductors (IWN2006), Kyoto, Japan, 2006

(40). Surface plasmon enhanced light emission from CdSe quantum dot nanocrystals
K. Okamoto, S. Vyawahare, A. Scherer
Conference on Lasers and Electro-Optics/ Quantum Electronics & Laser Science Conference (CLEO/QELS), Long Beach, USA, 2006

(39). Enhanced light emission from dye doped polymer layers using surface plasmons
T. D. Neal, K. Okamoto, A. Scherer
Conference on Lasers and Electro-Optics/ Quantum Electronics & Laser Science Conference (CLEO/QELS), Long Beach, USA, 2006

(38). Ultralow threshold on-chip toroidal microcavity nanocrystal quantum dot lasers
B. Min1, S. Kim, K. Okamoto, L. Yang, A. Scherer, H. Atwater, K. Vahala
Conference on Lasers and Electro-Optics/ Quantum Electronics & Laser Science Conference (CLEO/QELS), Long Beach, USA, 2006

(37). Ultralow threshold nanocrystal quantum dot lasers
B. Min, S. Kim, K. Okamoto, L. Yang, A.l Scherer, H. Atwater, K. Vahala
2006 Material Research Society (MRS) spring meeting, San Francisco, USA, 2005

(36) Surface plasmon enhanced super bright solid-state light emitters: Fabrication and characterization
K. Okamoto
(Invited by Prof. M. Barbic, UCSLB)
CSU-Long Beach Physics Colloquium, Long Beach, USA, 2005

(35). Surface plasmon enhanced high-speed spontaneous emission of InGaN/GaN
K. Okamoto, I. Niki, Y. Narukawa, T. Mukai, Y. Kawakami, A. Scherer
2005 Material Research Society (MRS) fall meeting, Boston, USA, 2005

(34). New applications of nano-structured-metal/semiconductor and -metal/liquid interface
K. Okamoto, A. Scherer
MRS – Spring Meeting 2005, San Fransisco, USA, 2005

(33). Surface plasmon enhanced InGaN light emitter
K. Okamoto, I. Niki, A. Shvartser, G. Maltezos, Y. Narukawa, T. Mukai, K. Nishizuka, Y. Kawakami, A. Scherer
SPIE Photonics West, Optelectronics 2005, San Jose, California, USA,2005.

(32). Improved Optical Heterodyne Detected Transient Grating Method by using a Thin Film Grating
K Okamoto, Z. Zhang, D. T. Wei, and A. Scherer
AVS, 51st International Symposium & Exhibition, Anaheim, USA, 2004.

(31). Temporal and spatial-resolved nonlinear spectroscopy of InGaN/GaN
K. Okamoto, Y. Kawakami, M. Terazima, and A. Scherer
Frontiers in Optics 2004/ Laser Science XX (FiO/LS) - The 88th OSA annual meeting -, Rochester, USA, 2004

(30). Surface plasmon enhanced super bright InGaN light emitter
K. Okamoto, I. Niki, A. Shvartser, Y. Narukawa, T. Mukai, and A. Scherer
MRS - International Workshop on Nitride Semiconductors (IWN2004), Pittsburgh, USA, 2004

(29). Surface plasmon enhanced internal quantum efficiencies of emission from InGaN/GaN quantum wells
K. Okamoto, I. Niki, A. Shvartser, Y. Narukawa, T. Mukai, and A. Scherer
The Conference on Lasers and Electro-Optics/ International Quantum Electronics Conference (CLEO/IQEC), San Francisco, USA, 2004

(28). Photothermal molecular sensing by using metal thin-film nano grating for chemical and biomedical applications
K Okamoto, Z. Zhang, D. T. Wei, and A. Scherer
The International Conference On Metallurgical Coatings And Thin Films (ICMCTF), San Diego, USA, 2004.

(27). Near-field Scanning Optical Microscopy of Photonic Crystal Laser
K. Okamoto, M. Lončar, T. Yoshie, A. Scherer
PECS-V: International Workshop on Photonic and Electromagnetic Crystal Structures, Kyoto, Japan 2004
(pdf 163KB)

(26). Photonic crystal nanocavity modes probed by near-field scanning optical microscopy
K. Okamoto, M. Lončar, T. Yoshie, A. Scherer
2003 Material Research Society (MRS) fall meeting, Boston, USA, 2003

(25). Nanograting for photo-thermal detection
Z. Zhang, K. Okamoto, D. T. Wei, and A. Scherer
AVS The Science & Technology Society, Southern California Chapter, Anaheim, USA, 2003.

(24). Molecular detection based on the nonlinear optical effect with nano-grating
K Okamoto, Z. Zhang, D. T. Wei, and A. Scherer
AVS The Science & Technology Society, Southern California Chapter, Anaheim, USA, 2003.

(23). Recombination dynamics in low-dimensional nitride semiconductors
Y. Kawakami, A. Kaneta, K Omae, A. Shikanai, K. Okamoto, G. Marutsuki, Y. Narukawa, T. Mukai, S. Fujita
The 5th International Conference on Nitride Semiconductors (ICNS-5), Nara, Japan. 2003

(22). Sub-Microscopic transient lens spectroscopy of InGaN/GaN quantum wells
K. Okamoto, Y. Kawakami, S. Fujita, A. Scherer
The 5th International Conference on Nitride Semiconductors (ICNS-5), Nara, Japan. 2003

(21). Nerr-field scanning optical microscopy of photonic crystal high-Q nanocavities
K. Okamoto, L. Marko, T. Yoshie, A. Scherer, Y. Qui, P. Gogna
Conference on Lasers and Electro-Optics/ Quantum Electronics & Laser Science Conference (CLEO/QELS), Baltimore, Maryland, USA, 2003

(20). Recombination mechanism in low-dimensional nitride semiconductors
Y. Kawakami, K. Omae, A. Shikanai, K. Okamoto, A. Kaneta, Sg. Fujita, J. Puls, F. Henneberger, Y. Narukawa, G. Marutsuki, S. Nagahama, T. Mukai
SPIE Photonics West Optelectronics 2003, San Jose, California, USA, 2000

(19). Localized cavity modes and dielectric band modes of photonic crystal probed by near-field scanning optical microscopy
K. Okamoto, L. Marko, T. Yoshie, A. Scherer, Y. Qui, P. Gogna
International Workshop on Photonic and Electromagnetic Crystal Structures (PECS-IV), Los Angeles, USA 2002

(18). Nonradiative Recombination Processes of Carrier in InGaN/GaN probed by the Microscopic Transient Lens Spectroscopy
K. Okamoto, K. Inoue, Y. Kawakami, Sg. Fujita, M. Terazima, A. Tujimura, I. Kidoguchi
The 12th International Conference on Photoacoustic and Photothermal Phenomena, Toronto, Canada 2002

(17). Spatial inhomogeneity of photoluminescence in InGaN single quantum well structures
A. Kaneta, G. Marutsuki, K. Okamoto, Y. Kawakami, Y. Nakagawa, G. Shinomiya, T. Mukai, Sg. Fujita
The 4th International Conference on Nitride Semiconductors, Denver, Colorado USA. 2001

(16). Carrier dynamics in InGaN/GaN SQW structure probed by the transient grating method with subpicosecond pulsed laser
K. Okamoto, A. Kaneta, K. Inoue, Y. Kawakami, M. Terazima, T. Mukai, G. Shinomiya, Sg. Fujita
The 4th International Conference on Nitride Semiconductors, Denver, Colorado, USA. 2001

(15). Dynamics of Spontaneous and Stimulated Emission in GaN-based Semiconductors
Y. Kawakami, K. Omae, A. Kaneta, K. Okamoto, T. Izumi, S. Saijo, K. Inoue, Y. Narukawa, T. Mukai, Sg. Fujita
SPIE Photonics West Optelectronics 2001, San Jose, California, USA, 2001

(14). Time-Resolved Fluorescence Spectroscopy of Dopamine in the Single Cells
M. Mabuchi, J. Shimada, K. Okamoto, Y. Kawakami, Sg. Fujita, K. Matsushige,
SPIE Photonics West Optelectronics 2001, San Jose, California, USA,2001

(13). Direct Observation of the Nonradiative Recombination Processes in InGaN-based LEDs probed by the third-order Nonlinear Spectroscopy
K. Okamoto, S. Saijo, Y. Kawakami, Sg. Fujita, M. Terazima, T. Mukai, G. Shinomiya, S. Nakamura
SPIE Photonics West Optelectronics 2001, San Jose, California, USA, 2001

(12). Microscopic Patterning on the Polysilane Films by the Laser Induced Grating Technique.
K. Okamoto, T. Tojo, H. Tada, M. Terazima, K. Matsushige
Korea-Japan Joint Forum 2000, Organic Materials for Electronics and Photonics, Kyoto 2000

(11). Optical Properties of Highly Oriented Oligosilane Films.
T. Tojo, K. Okamoto, M. Kako, H. Tada, Y. Kawakami, Y. Nakadaira, Sg. Fujita, K. Matsushige
International Chemical Congress of Pacific Basin Societies, Honolulu, Hawaii, 2000

(10). Novel Surgical Micro-tumer Tracking System for Lung Tumors.
J. Shimada, K. Okamoto, K. Kuboyama, K. Matsushige
World Congress of High Tech Medicine, October Hannover, Germany, 2000

(9). Surgical Micro-Tumor Tracking System for Lung Tumors
J. Shimada, K. Kuboyama, K. Okamoto, K. Matsushige
World Conference on Lung Canser, September Tokyo, 2000

(8). Recombination Dynamics in GaN and InGaN/GaN Multiple Quantum Wells on Air-bridged Lateral Epitaxial Grown GaN Layers
T. Izumi, K. Inoue, Y. Narukawa, K. Okamoto, Y. Kawakami, Sg. Fujita, A. Tsujimura, I. Kidoguchi, Y. Ban
International Workshop on Niteride Semiconductors, Nagoya, 2000

(7). Nonradiative Recombination Processes in GaN-based Semiconductors Probed by the Transient Grating Method.
K. Okamoto, Y. Kawakami, Sg. Fujita, M. Terazima, S. Nakamura,
International Workshop on Niteride Semiconductors, Nagoya, 2000

(6). Time-resolved Luminescence Spectroscopy in InGaN-based Semiconductors
Y. Kawakami, K. Omae, A. Kaneta, K. Okamoto, T. Izumi, S. Saijo, K. Inoue, Y. Narukawa, S. Nakamura, Sg. Fujita
Frontier Science Research Conference, La Jolla, USA, 2000

(5). Photothermal Processes of wide-bandgap Semiconductors probed by the Transient Grating Method.
K. Okamoto, Y. Kawakami, Sg. Fujita, M. Terazima
11th International Conference on Photothermal and Photo acoustic Phenomena, Kyoto, 2000

(4). Time-reserved Photoluminescence Spectroscopy in GaN-based Semiconductors with Micron Special.
T. Izumi, Y. Narukawa, K. Okamoto, Y. Kawakami , Shigeo Fujita, S. Nakamura
Intern. Conf. On Luminescence and Optical Spectroscopy of Condensed Matter, Osaka, 1999

(3). Photothermal Processes of ZnCdSe/ZnSe Quantum Well Structures Probed by the Third-order Nonlinear Spectroscopy.
K. Okamoto, Y. Kawakami, Sg. Fujita, M. Terazima
The Third SANKEN International Symposium, Osaka, 2000

(2). Time-space resolved Photoluminescence from (Zn,Cd)Se -based Quantum Dots
K. Okamoto, H.-C. Ko, Y. Kawakami, Sg. Fujita
The 9th International Conference on II-VI Compounds, Kyoto, 1999

(1). Translational Diffusion of Transient Radicals Studied by the Transient Grating Method.
M. Terazima, K. Okamoto, N. Hirota
Yamada Conferebce XXXXII on structure, flactuation, and relaxation in solution. Yamada, 1994


Awards
(11). Kansai Silicon valley Forum, Venture Business Prize, Mar. 2001
(10). JSPS Research Fellowship for Young Scientists, Apr. 2000 – Dec. 2002
(9). Grant of the Research Foundation for Opto-Science and Technology, Apr. 2000 – Mar. 2002
(8). Kansai Techno-Idea Prize ’2000, Nov. 2000
(7). Konica Imaging Science Prize, Jan. 2000
(6). Kansai techno-Idea Prize ’99, Japan, Nov. 1999
(5). Young Researcher Prize in Kyoto University-Venture Business Lab., May, 1999
(4). Kansai Silicon valley Forum, Venture Idea Prize, May 1999
(3). KU-VBL, Techno-Idea Prize, Nov. 1998
(2). KU-VBL, Research Grant for Young Scientists, Sep. 1998 – Mar. 2001
(1). Fellowship of the Japan Scholarship Foundation, Apr. 1994 – Mar. 1997


US Patents
(4). Light emitting semiconductor device e.g. light emitting diode, has spatial spacing between metal layer and active layer, and textured interface region between metal layer and N-type semiconductor layer
A. Scherer, and K. Okamoto
February, 2004, Submitted (WO2005081813, US2005285128).
(3). Semiconductor light-emitting device, e.g. light emitting diode, has first electrically conductive type semiconductor layer provided with recess and is contiguous to active layer formed within and without the recess in plane orientations
Y. Narukawa, I. Niki, A. Scherer, K. Okamoto, Y. Kawakami, M. Funato, S. Fujita
October, 2003, Submitted (US2005082544).
(2). Nitride Semiconductor Device and a Process manufacturing the same
Inventors: Y. Narukawa, I. Niki, A. Scherer, K. Okamoto, Y. Kawakami, M. Funato, S. Fujita
Assignee: Nichia Corporation
United States Patent 6,876,009
April 5, 2005

(1). Electric Field Sensor Using Liquid Crystal and Three-dimensional Movie Player/Recorder Using the Same.
Inventors: K. Okamoto, Y. Kawakami
Assignee: F. Suzuki, Toko, Co., Ltd., S. Miyazato, A. Sakai
United States Patent 6,629,762
October 7, 2003


Japanese Patents
(5). Nitride Semiconductor Device and a Process manufacturing the same
Inventors: Y. Narukawa, I. Niki, A. Scherer, K. Okamoto, Y. Kawakami, M. Funato, S. Fujita
Assignee: Nichia Corporation
Submitted 2003-284758, Published 2004-193555

(4). Optical assembly device
Inventors: Y. Kawakami, K. Okamoto, A. Kaneta, S. Fujita
Assignee: Kansai Technology Licensing Organization Co.
Submitted 2001-5881, Published 2002-123965

(3). Optical memory device
Inventors: Y. Kawakami, K. Okamoto, A. Kaneta, S. Fujita
Assignee: Kansai Technology Licensing Organization Co.
Submitted 2000-244127,

(2). Near-field optical microscopic device
Inventors: Y. Kawakami, K. Okamoto, A. Kaneta, S. Fujita
Assignee: Kansai Technology Licensing Organization Co.
Submitted 2000-216432, Published 2002-31591

(1). Electric Field Sensor Using Liquid Crustal and Three-dimensional Movie Player/Recorder Using the Same.
Inventors: K. Okamoto, Y. Kawakami
Assignee: F. Suzuki, Toko, Co., Ltd., S. Miyazato, A. Sakai
Japanese Patent 3,515,994

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