Photonic eigenmodes and light propagation in periodic structures of chiral nanoparticles

2011 ◽  
Vol 83 (24) ◽  
Author(s):  
A. Christofi ◽  
N. Stefanou ◽  
G. Gantzounis
Keyword(s):  
Light Propagation ◽  
Periodic Structures

scholarly journals Waveguide amplification of dye fluorescece in NLC

2018 ◽  
Vol 10 (4) ◽  
pp. 106
Author(s):  
Nikolay M. Shtykov ◽  
Serguei P. Palto ◽  
Boris A. Umanskii ◽  
Dmitry O. Rybakov ◽  
Ivan V. Simdyankin
Keyword(s):  
Liquid Crystal ◽  
Light Propagation ◽  
Optical Pumping ◽  
Periodic Structures ◽  
Wave Theory ◽  
Distributed Feedback ◽  
Research Network ◽  
Liquid Crystal Layer ◽  
Planar Layer ◽  
Uniform Liquid

The amplification of spontaneous fluorescence in a planar layer of a nematic liquid crystal doped with a DCM dye is experimentally studied in a waveguide mode of light propagation. The optical pumping threshold of the superfluorescence is 0.65 MW/cm2. The gain value reaches 0.0014 μm-1 at a pumping intensity of 1.38 MW/cm2. Full Text: PDF ReferencesLiquid Crystal Microlasers, Eds. L. M. Blinov, R. Bartolino (Kerala India, Transworld Research Network 2010). DirectLink H. Kogelnik, C. V. Shank, "Coupled‐Wave Theory of Distributed Feedback Lasers", J. Appl. Phys. 43, 2327 (1972). CrossRef I. P. Il'chishin, E. A. Tihonov, V. G. Tishchenko, M. T. Shpak, "Generation of a tunable radiation by impurity cholesteric liquid crystals", JETP Lett. 32, 25 (1980). DirectLink A. Yariv, M. Nakamura, "Periodic structures for integrated optics", IEEE Quant. Electr. 13, 233 (1977). CrossRef N. M. Shtykov, M. I. Barnik, L. M. Blinov B. A. Umanskii, S, P. Palto, "Amplification of the emission of a liquid-crystal microlaser by means of a uniform liquid-crystal layer", JETP Lett. 85, 602 (2007). CrossRef

scholarly journals The Role of Periodic Structures in Light Harvesting

Plants ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1967
Author(s):  
Eugene Bukhanov ◽  
Alexandr V. Shabanov ◽  
Mikhail N. Volochaev ◽  
Svetlana A. Pyatina
Keyword(s):  
Light Propagation ◽  
Periodic Structures ◽  
Spectral Characteristics ◽  
Visible Spectral Range ◽  
Ordered Structure ◽  
Plant Leaves ◽  
Long Period ◽  
Spectrum Area ◽  
Photon States

The features of light propagation in plant leaves depend on the long-period ordering in chloroplasts and the spectral characteristics of pigments. This work demonstrates a method of determining the hidden ordered structure. Transmission spectra have been determined using transfer matrix method. A band gap was found in the visible spectral range. The effective refractive index and dispersion in the absorption spectrum area of chlorophyll were taken into account to show that the density of photon states increases, while the spectrum shifts towards the wavelength range of effective photosynthesis.

LIGHT PROPAGATION THROUGH UNPERFORATED METALLIC STRUCTURE: PLASMON RESONANCE INDUCED TRANSPARENCY

2004 ◽  
Vol 18 (23) ◽  
pp. 1181-1188 ◽  
Author(s):  
XIANGANG LUO ◽  
HAO WANG ◽  
JIEPING SHI ◽  
HANMIN YAO
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Light Propagation ◽  
Periodic Structures ◽  
Plasmon Mode ◽  
Plasmon Band ◽  
Metallic Structures ◽  
One Dimensional ◽  
Induced Transparency ◽  
Plasmon Polaritons

The transmission properties of rectangular one-dimensional unperforated metallic periodic structures for frequencies close to the surface plasmon band are investigated experimentally and theoretically. The results reveal that it is possible to obtain unexpectedly large transmissions through thick unperforated metallic structures. The mechanisms of enhanced transmissions are attributed to resonant excitations of three kinds of plasmon radiations: coupled surface plasmon polaritons, horizontal localized groove plasmon mode, and vertical localized groove plasmons mode. Once the surface plasmon polaritons and the vertical groove plasmon modes are excited simultaneously, the transmission approaches to maximum at the coincident condition.

Periodic Structure of Blaze Grating in Abalone Shell

2005 ◽  
Vol 288-289 ◽  
pp. 669-672
Author(s):  
J. Wang ◽  
X.J. Peng ◽  
Chun Wei Yuan
Keyword(s):  
Light Propagation ◽  
Periodic Structures ◽  
Two Dimensional ◽  
Sem Images ◽  
Convex Shape ◽  
Structural Colors ◽  
Groove Structure ◽  
Control Light ◽  
Blaze Grating ◽  
Abalone Shell

Periodic structures, such as photonic crystals and gratings, offer the ability to control light propagation and produce structural colors (not produced by pigments). Structural colors are quite widespread in nature, such as in opals and some animals. The abalone shells attract much attention due to its fracture resistant. In present work, we report on the microstructure of the surface area in where the iridescence color appears found in abalone shell shows a groove structure of blaze grating. The scanning electron microscopy (SEM) images of its iridescent layer show layers of platelets. The abalone shell has a statistically regular arranged tile structure. This specific tile structure serves as a two-dimensional grating to cause the iridescence phenomenon. Unlike opals, the iridescence color of the abalone shells is not directional due to the two-dimensional arrangement of the reflection grating structure and the convex shape of the tiles.

Driven periodic structures in random environment

1999 ◽  
Vol 09 (PR10) ◽  
pp. Pr10-85-Pr10-87
Author(s):  
V. M. Vinokur
Keyword(s):  
Random Environment ◽  
Periodic Structures
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