|
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) |
|
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 |
|
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). |
