Anisotropy of two-photon absorption in cubic direct-band-gap semiconductors

1992 ◽  
Vol 45 (11) ◽  
pp. 5926-5932 ◽  
Author(s):  
M. I. Dykman ◽  
Yu. G. Rubo
Keyword(s):  
Band Gap ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Direct Band Gap ◽  
Two Photon ◽  
Direct Band

scholarly journals Enhanced two-photon absorption in a hollow-core photonic-band-gap fiber

2011 ◽  
Vol 83 (3) ◽  
Author(s):  
Kasturi Saha ◽  
Vivek Venkataraman ◽  
Pablo Londero ◽  
Alexander L. Gaeta
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Photon Absorption ◽  
Hollow Core ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photonic Band

LASER-INDUCED MULTIPHOTON PHOTOCONDUCTIVITY IN DIRECT AND INDIRECT BAND GAP CRYSTALS USING Z-SCAN TECHNIQUE

2009 ◽  
Vol 23 (23) ◽  
pp. 2783-2789 ◽  
Author(s):  
ARUN GAUR ◽  
D. K. SHARMA ◽  
K. S. SINGH ◽  
NAGESHWAR SINGH
Keyword(s):  
Absorption Coefficient ◽  
Band Gap ◽  
Laser Pulses ◽  
Beam Waist ◽  
Photon Absorption ◽  
Nanosecond Laser ◽  
Direct Band Gap ◽  
Direct Band ◽  
Nanosecond Laser Pulses ◽  
Indirect Band Gap

Nanosecond laser pulses have employed the photoconductive Z-scan technique. Photoconductivity traces measured by moving the sample across the laser beam waist were used for measuring two and three-photon absorption processes. The value of the three-photon absorption coefficient β3=9.6×10-10 cm 3/ GW 2 in the case of direct, and 8.96×10-12 cm 3/ GW 2 and 5.0×10-12 cm 3/ GW 2 in the case of indirect band gap crystals have been estimated from a comparison of traces measured by exciting the sample with the first and second harmonics of Nd : YAG laser. The low value of β3 in the case of indirect band gap crystals compared to direct band gap crystals is attributed to phonon-assisted transitions.

Two-photon absorption and multiphoton-induced photoluminescence of bulk GaN excited below the middle of the band gap

2003 ◽  
Vol 82 (26) ◽  
pp. 4714-4716 ◽  
Author(s):  
Y. Toda ◽  
T. Matsubara ◽  
R. Morita ◽  
M. Yamashita ◽  
K. Hoshino ◽  
...  
Keyword(s):  
Band Gap ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Bulk Gan

Simulation of 3D Layer-By-Layer Photonic Crystals

2007 ◽  
Vol 121-123 ◽  
pp. 1165-1170
Author(s):  
S.S. Fan ◽  
R. Guo ◽  
Z.Y. Li ◽  
W.H. Huang
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Photon Absorption ◽  
Layer By Layer ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Laser Microfabrication ◽  
Microfabrication Technique ◽  
Photonic Band

3D layer-by-layer photonic crystals possess a full photonic band gap. Simulation of 3D layer-by-layer photonic crystals can optimize the parameters of the photonic crystals to get useful photonic band gap by solving Maxwell’s equations using the plane-wave-based transfer-matrix method. The relations between the parameters (rod pitch a, rod width w, rod thickness h and rod refractive index n) and the photonic band gap have been simulated. We also have fabricated a 3D layer-by-layer photonic crystal with femtosecond laser microfabrication technique through two-photon-absorption photopolymerization of resin. Its reflection spectra have been detected which agree with the simulation result.

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