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Professor of Electrical Engineering Ph. D. Hideki KOYAMA
Kato, Hyogo 673-1494, Japan E-mail: koyama (Please add our domain name:
@hyogo-u.ac.jp) |
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Major
Research Projects -- Fabrication of anisotropic porous silicon layers by
anodization under polarized illumination -- Establilshment
of simple and safe fabrication methods of porous silicon layers for educational
purposes -- Evaluation of excitation energy
transfer by means of photoluminescence polarization memory in systems of
porous silicon/laser dye or porous anodic alumina/laser dye nanocomposites -- Development of simple and
effective teaching tools on measurement and control, optical communication,
etc.
Anisotropic porous silicon
nanostructures Porous
silicon layers made by electrochemical etching under polarized illumination show
anisotropic luminescence See
the original paper for
details |
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Recent Publications 1)
H. Koyama, “Different behavior of photoluminescence anisotropy in porous
silicon layers made by polarized-light-assisted electrochemical etching”, Appl. Phys. Lett. vol.80, no.6,
pp.965-967 (2002). 2) H. Koyama, “Anisotropic
photoluminescence from porous silicon layers made under polarized
illumination: Origin of contradictory experimental observations”, J. Appl. Phys. vol.93, no.5,
pp.2410-2413 (2003). 3) H. Koyama, “Polarization
properties of the visible photoluminescence from porous silicon” (Invited review
paper), Recent Research Developments in Applied Physics vol.6
(Transworld Research Network, Kerala, India, 2003) pp.373-389. 4) H. Koyama, “In-plane refractive index anisotropy in porous silicon
layers induced by polarized illumination during electrochemical etching”, J. Appl.
Phys. vol.96, no.7, pp.3716-3720 (2004). 5) H. Koyama and K. Takemura, “Fabrication of luminescent porous silicon
layers using extremely dilute HF solutions”, in Nanoscale Devices, Materials, and Biological Systems: Fundamental and
Applications, M, Cahay, M.Urquidi-Macdonald,
S. Bandyopadhyay, P. Guo,
H. Hasegawa, N. Koshida, J. P. Leburton,
D. J. Lockwood, S. Seal, and A. Stella (eds.), The Electrochemical Society
(2004) p.289. 6) H. Koyama, “Strong photoluminescence
anisotropy in porous silicon layers prepared by polarized-light assisted
anodization”, to be published in Solid State Commun.
Solid State Commun.
vol.138, no.12, pp.567-570 (2006). 7) H. Koyama, “Photoluminescence properties
of porous silicon layers prepared by electrochemical etching in extremely
dilute HF solutions”, J.
Appl. Electrochem. vol.36, no.9, pp.999-1003 (2006). 8) A. Chouket, H.
Elhouichet, M. Oueslati,
H. Koyama, B. Gelloz, and N. Koshida,
“Energy transfer in porous-silicon/laser-dye composite evidenced by
polarization memory of photoluminescence”, Appl. Phys. Lett. vol.91, 211902
(2007) 9) B. Gelloz, H.
Koyama, and N. Koshida, “Polarization memory of
blue and red luminescence from nanocrystalline
porous silicon treated by high-pressure water vapor annealing”, Thin Solid Films vol.517,
pp.376-379 (2008). 10) A. Chouket,
B. Gelloz, H. Koyama, H. Elhouichet,
M. Oueslati, and N. Koshida,
“Effect of high-pressure water-vapor annealing on energy transfer ini dye-impregnated porous silicon”, J. Lumin. vol.129,
pp.1332-1335 (2009). 11) A. Chouket,
H. Elhouichet, H. Koyama, B. Gelloz,
M. Oueslati, and N. Koshida,
“Multiple energy transfer in porous silicon/Rh6G/RhB
nanocomposite evidenced by photoluminescence and its polarization memory”, Thin Solid Films vol.518,
pp.S212-S216 (2010). 12) B. Gelloz, N.
Harima, H. Koyama, H. Elhouichet, and N. Koshida, “Energy transfer from phosphorescent
blue-emitting oxidized porous silicon to rhodamine 110”, Appl. Phys. Lett. vol.97, 171107
(2010). 13) H. Elhouichet,
N. Harima, H. Koyama, and N.V. Gaponenko, “Energy
transfer in porous anodic alumina/rhodamine 110 nanocomposites”, J. Lumin. vol.132,
pp.2232-2234 (2012). |
