Imaging with ultra-lightweight flat lenses: visible near-IR to long-wave IR (Conference Presentation)

2019 ◽  
Author(s):  
Sourangsu Banerji ◽  
Monjurul F. Meem ◽  
Apratim Majumder ◽  
Berardi Sensale-Rodriguez ◽  
Rajesh Menon
Keyword(s):  
Near Ir ◽  
Long Wave

Gold-black as IR absorber and solar cell enhancer

2009 ◽  
Vol 1208 ◽  
Author(s):  
Robert E. Peale ◽  
Justin W Cleary ◽  
Masahito Ishigami ◽  
Christian W Smith ◽  
Kevin Baillie ◽  
...  
Keyword(s):  
Characteristic Length ◽  
Thin Film Solar Cells ◽  
Photoelectron Emission ◽  
Conducting Film ◽  
Length Scales ◽  
Near Ir ◽  
Long Wave ◽  
Deposition Parameters ◽  
Plasmon Resonances ◽  
Film Polymer

AbstractInfrared absorbance and visible/near-IR excited plasmon resonances are investigated in gold-black, a porous nano-structured conducting film. Polymer infusion (for hardening) generally reduced absorbance in the long wave IR but has little effect at THz wavelengths. The characteristic length scales of the structured films vary considerably as a function of deposition parameters, but the absorbance is found to be only weakly correlated with these distributions. Initial investigations of gold-black by photoelectron emission microscopy (PEEM) reveal plasmon resonances, which have potential to enhance the efficiency of thin film solar cells. For films with different characteristic length scales, the plasmon resonances appear in structures with similar length scales.

scholarly journals Design and Evaluation of a Polarizer Filter

2018 ◽  
Vol 15 (3) ◽  
pp. 287-291
Author(s):  
Baghdad Science Journal
Keyword(s):  
Short Wave ◽  
Hafnium Dioxide ◽  
Coating Material ◽  
Magnesium Fluoride ◽  
Configuration Design ◽  
Evaluation Design ◽  
Pass Filter ◽  
High Transmission ◽  
Near Ir ◽  
Long Wave

This research includes theoretical and evaluation design of a polarizer filter of high transmission in the near IR region of (900-1200nm) for different incidence angles to obtain a long wave and short wave pass filter using analytical calculations. Results refer to a new configuration design in fewer layers than used in previous studies in the long wave pass at incidence angles (45o,50o,55o). Adopted Hafnium dioxide (HfO2) and Magnesium fluoride (MgF2) as coating material at design wavelength (933nm), the study also included design short wave pass polarizer by using the same coating material.

scholarly journals Интерференция встречных волн в планарной мелкослоистой структуре графен--диэлектрик"

2019 ◽  
Vol 127 (9) ◽  
pp. 434
Author(s):  
С.А. Афанасьев ◽  
Д.А. Евсеев ◽  
Д.И. Семенцов
Keyword(s):  
Frequency Domain ◽  
Phase Difference ◽  
Dielectric Structure ◽  
Optimal Conditions ◽  
Terahertz Frequency ◽  
Modulation Effect ◽  
Wave Approximation ◽  
Near Ir ◽  
Long Wave ◽  
Long Wave Approximation

The incidence of two counterpropagating coherent waves on the opposite surfaces of a planar periodically layered graphene – dielectric structure was studied. In the long-wave approximation, it is shown that, due to the variation of the phase difference of waves incident on the structure, it is possible to control the intensity of outgoing waves and the absorption of radiation in the structure. In the terahertz frequency domain there are close to optimal conditions for the realization of the intensity modulation effect, and in the near-IR and visible ranges the modulation of the absorbance of the structure is possible.

Surface Brightness Scale of Galactic Cepheids

1999 ◽  
Vol 190 ◽  
pp. 561-562
Author(s):  
G. P. Di Benedetto
Keyword(s):  
Surface Brightness ◽  
Variable Stars ◽  
Giant Stars ◽  
Near Ir

An accurate calibration of the surface brightness scaleSVas a function of the near-IR color (V–K) has been recently measured for non-variable Galactic dwarf and giant stars. It can be shown that this correlation can be applied to theSVscale of Galactic Cepheid variable stars, which are of major cosmological interest.

Plasmon-assisted interaction of Si with light, for cancer hyperthermia and electromagnetic energy harvest

2020 ◽  
Vol 92 (2) ◽  
pp. 20101
Author(s):  
Behnam Kheyraddini Mousavi ◽  
Morteza Rezaei Talarposhti ◽  
Farshid Karbassian ◽  
Arash Kheyraddini Mousavi
Keyword(s):  
Silicon Nanowires ◽  
Metallic Nanoparticles ◽  
Near Infrared ◽  
Optical Transition ◽  
Electromagnetic Energy ◽  
Energy Harvest ◽  
Absorption Enhancement ◽  
Ir Absorption ◽  
Absorption Mechanism ◽  
Near Ir

Metal-assisted chemical etching (MACE) is applied for fabrication of silicon nanowires (SiNWs). We have shown the effect of amorphous sheath of SiNWs by treating the nanowires with SF6 and the resulting reduction of absorption bandwidth, i.e. making SiNWs semi-transparent in near-infrared (IR). For the first time, by treating the fabricated SiNWs with copper containing HF∕H2O2∕H2O solution, we have generated crystalline nanowires with broader light absorption spectrum, up to λ = 1 μm. Both the absorption and photo-luminescence (PL) of the SiNWs are observed from visible to IR wavelengths. It is found that the SiNWs have PL at visible and near Infrared wavelengths, which may infer presence of mechanisms such as forbidden gap transitions other can involvement of plasmonic resonances. Non-radiative recombination of excitons is one of the reasons behind absorption of SiNWs. Also, on the dielectric metal interface, the absorption mechanism can be due to plasmonic dissipation or plasmon-assisted generation of excitons in the indirect band-gap material. Comparison between nanowires with and without metallic nanoparticles has revealed the effect of nanoparticles on absorption enhancement. The broader near IR absorption, paves the way for applications like hyperthermia of cancer while the optical transition in near IR also facilitates harvesting electromagnetic energy at a broad spectrum from visible to IR.

NEAR IR FARADAY ROTATION ON YIG DOPED WITH TETRAVALENT AND PENTAVALENT ELEMENTS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-969-C8-970 ◽  
Author(s):  
F. D'Orazio ◽  
F. Giammaria ◽  
F. Lucari ◽  
G. Parone
Keyword(s):  
Faraday Rotation ◽  
Near Ir

World Economic Crisis as a Process of Substitution of Technological Modes

2009 ◽  
pp. 26-38 ◽  
Author(s):  
S. Glaziev
Keyword(s):  
Economic Crisis ◽  
Economic Activity ◽  
Sharp Increase ◽  
Energy Resources ◽  
Long Wave ◽  
The World ◽  
World Economic ◽  
Technological Mode ◽  
World Economic Crisis

The article analyzes fundamental reasons for the world economic crisis in the light of global technological shifts. It proves that it is caused by the substitution of technological modes. It is shown that sharp increase and slump in stock indices and prices for energy resources are typical of the process of technological substitution which occurs regularly according to the rhythm of long-wave fluctuations of the world economic activity. The article rationalizes a package of anti-crisis measures aimed at stimulating the new technological mode. Its structure and role of the locomotive factor of the new long wave of economic growth are revealed.

Results of Spatial Structure of Atmosphere Radiation in a Spectral Range (1.5–2) µm Research

2018 ◽  
pp. 7-13
Author(s):  
Anton M. Mishchenko ◽  
Sergei S. Rachkovsky ◽  
Vladimir A. Smolin ◽  
Igor V . Yakimenko
Keyword(s):  
Spatial Structure ◽  
Unmanned Aerial Vehicle ◽  
Wavelength Range ◽  
Spectral Range ◽  
Near Ir ◽  
Optoelectronic Systems ◽  
Aerial Vehicle

Results of experimental studying radiation spatial structure of atmosphere background nonuniformities and of an unmanned aerial vehicle being the detection object are presented. The question on a possibility of its detection using optoelectronic systems against the background of a cloudy field in the near IR wavelength range is also considered.

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