Optical properties of silver nanocomposites and photonic band gap – Pressure dependence

2016 ◽  
Vol 368 ◽  
pp. 174-179 ◽  
Author(s):  
N.R. Ramanujam ◽  
K.S. Joseph Wilson
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Pressure Dependence ◽  
Photonic Band Gap ◽  
Silver Nanocomposites ◽  
Photonic Band

Modulation of Three Dimensional Photonic Band Gap in Visible Region

2007 ◽  
Vol 31 ◽  
pp. 20-22 ◽  
Author(s):  
Y.P. Liu ◽  
Y.P. Guo ◽  
Z.J. Yan ◽  
C.M. Huang ◽  
Y.Y. Wang
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Bragg Reflection ◽  
Quartz Substrate ◽  
Three Dimensional ◽  
Visible Region ◽  
Sphere Size ◽  
Vertical Deposition Method ◽  
Photonic Band

Three dimensional (3D) SiO2 photonic crystals films were fabricated on quartz substrate by vertical deposition method. The effects of various preparation parameters on optical properties were studied by optical transmission measurements. Bragg reflection on parallel sets of (111) planes were observed in all the samples. The center wavelength of [111] photonic band gap (PBG) varied from 450 nm to 680 nm with the increasing sphere size. For a given sphere size, the (111) Bragg reflection of as-deposited sample shifted towards lower wavelengths as the sintering temperature T increased. The role of evaporation temperature on the optical properties of the film was also investigated. The PBG can be correspondingly modulated in visible region by changing various preparation parameters.

Optical Properties of Laser Lines and Fluorescent Spectrum in Cholesteric Liquid Crystal Laser

2015 ◽  
Vol 15 (10) ◽  
pp. 7632-7639 ◽  
Author(s):  
Mi-Yun Jeong ◽  
Ki Soo Chung ◽  
J.W. Wu
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Cholesteric Liquid Crystal ◽  
Polarized Light ◽  
Lasing Threshold ◽  
Left Handed ◽  
Fluorescent Spectrum ◽  
Photonic Band ◽  
Circular Polarized Light

We experimentally studied the comprehensive optical properties of the laser lines and fluorescent spectrum generated by a continuous tunable cholesteric liquid crystal (CLC) laser array. We found that the laser lines generated from a CLC with a right-handed circular helix were right-handed circular polarized and laser lines generated from a CLC with a left-handed circular helix were left-handed circular polarized. Inside the photonic band gap, the CLC structure with right-(left-) handed helicity suppressed the fluorescence generated with right (left) circular polarized light, and instead the suppressed right (left) circular polarized light energy moved to the outside of the photonic band gap, so we can say that the fluorescence intensity outside of the photonic band gap is enhanced with right (left) handed circular polarized light. Depending on the position of the photonic band gap, the fluorescence quantum yield value increased by up to ∼15%. These enhanced fluorescence intensities at the PBG edge will evolve into lasing at the upper lasing threshold. It is particularly interesting to see that the fluorescence intensity and shape could be controlled by adjusting the external geometrical factor of the photonic band gaps. The lasing threshold of the CLC lasers was in the range of 1.5–5.3 μJ/pulse. For CLC laser device applications, it is necessary and essential to know the optical properties of the generated laser lines and of the fluorescence spectrum.

scholarly journals Optical properties of inverted opal photonic band gap crystals with stacking disorder

2003 ◽  
Vol 67 (1) ◽  
Author(s):  
Z. L. Wang ◽  
C. T. Chan ◽  
W. Y. Zhang ◽  
Z. Chen ◽  
N. B. Ming ◽  
...  
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Photonic Band ◽  
Stacking Disorder

Optical properties of photonic band gap fibers made of silicate glass

2006 ◽  
Author(s):  
Ryszard Buczynski ◽  
Dariusz Pysz ◽  
Tuomo Ritari ◽  
Przemyslaw Szarniak ◽  
Hanne Ludvigsen ◽  
...  
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Silicate Glass ◽  
Photonic Band Gap ◽  
Photonic Band

Photonic band gap phenomenon and optical properties of artificial opals

1997 ◽  
Vol 55 (6) ◽  
pp. 7619-7625 ◽  
Author(s):  
V. N. Bogomolov ◽  
S. V. Gaponenko ◽  
I. N. Germanenko ◽  
A. M. Kapitonov ◽  
E. P. Petrov ◽  
...  
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Photonic Band
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