Superfluorescent fiber source at 3.9 μm in the attenuation minimum of the atmospheric window 3–5 μm

1995 ◽  
Vol 16 (1) ◽  
pp. 75-82 ◽  
Author(s):  
J. Schneider
Keyword(s):  
Atmospheric Window ◽  
Superfluorescent Fiber Source

NEW DATA AND ANALYSIS FOR SF6 ABSORPTION MODELLING IN THE 10 MICRON ATMOSPHERIC WINDOW

2018 ◽  
Author(s):  
Laurent Manceron ◽  
P. Roy ◽  
Cyril Richard ◽  
Michel Loete ◽  
Vincent Boudon ◽  
...  
Keyword(s):  
Atmospheric Window

Terahertz Radiators Based on Si~3C-SiC MQW IMPATT Diodes

2020 ◽  
Vol 10 (4) ◽  
pp. 501-506
Author(s):  
Monisha Ghosh ◽  
Arindam Biswas ◽  
Aritra Acharyya
Keyword(s):  
High Frequency ◽  
Multiple Quantum Well ◽  
Multiple Quantum ◽  
Noise Performance ◽  
Rf Power ◽  
Drift Diffusion ◽  
Frequency Bands ◽  
Atmospheric Window ◽  
Lower Noise ◽  
Impatt Diodes

Aims:: The potentiality of Multiple Quantum Well (MQW) Impacts Avalanche Transit Time (IMPATT) diodes based on Si~3C-SiC heterostructures as possible terahertz radiators have been explored in this paper. Objective:: The static, high frequency and noise performance of MQW devices operating at 94, 140, and 220 GHz atmospheric window frequencies, as well as 0.30 and 0.50 THz frequency bands, have been studied in this paper. Methods: The simulation methods based on a Self-Consistent Quantum Drift-Diffusion (SCQDD) model developed by the authors have been used for the above-mentioned studies. Results: Thus the noise performance of MQW DDRs will be obviously better as compared to the flat Si DDRs operating at different mm-wave and THz frequencies. Conclusion:: Simulation results show that Si~3C-SiC MQW IMPATT sources are capable of providing considerably higher RF power output with the significantly lower noise level at both millimeter-wave (mm-wave) and terahertz (THz) frequency bands as compared to conventional flat Si IMPATT sources.

scholarly journals Performance simulation of polymer-based nanoparticle and void dispersed photonic structures for radiative cooling

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jay Prakash Bijarniya ◽  
Jahar Sarkar ◽  
Pralay Maiti
Keyword(s):  
Fdtd Method ◽  
Solar Spectrum ◽  
Thermal Infrared ◽  
Performance Estimation ◽  
Radiative Cooling ◽  
Slab Thickness ◽  
Slight Variation ◽  
Performance Simulation ◽  
Atmospheric Window ◽  
Substrate Independent

AbstractPassive radiative cooling is an emerging field and needs further development of material. Hence, the computational approach needs to establish for effective metamaterial design before fabrication. The finite difference time domain (FDTD) method is a promising numerical strategy to study electromagnetic interaction with the material. Here, we simulate using the FDTD method and report the behavior of various nanoparticles (SiO2, TiO2, Si3N4) and void dispersed polymers for the solar and thermal infrared spectrums. We propose the algorithm to simulate the surface emissive properties of various material nanostructures in both solar and thermal infrared spectrums, followed by cooling performance estimation. It is indeed found out that staggered and randomly distributed nanoparticle reflects efficiently in the solar radiation spectrum, become highly reflective for thin slab and emits efficiently in the atmospheric window (8–13 µm) over the parallel arrangement with slight variation. Higher slab thickness and concentration yield better reflectivity in the solar spectrum. SiO2-nanopores in a polymer, Si3N4 and TiO2 with/without voids in polymer efficiently achieve above 97% reflection in the solar spectrum and exhibits substrate independent radiative cooling properties. SiO2 and polymer combination alone is unable to reflect as desired in the solar spectrum and need a highly reflective substrate like silver.

Accurate frequency measurements for H_2O and ^16O_3 in the 119-cm^−1 OH atmospheric window

1997 ◽  
Vol 36 (33) ◽  
pp. 8526 ◽  
Author(s):  
Paolo De Natale ◽  
Luca Lorini ◽  
Massimo Inguscio ◽  
Ira G. Nolt ◽  
Jae H. Park ◽  
...  
Keyword(s):  
Frequency Measurements ◽  
Atmospheric Window

Research on the Influence of Ocean Atmosphere to Infrared Detection

2012 ◽  
Vol 472-475 ◽  
pp. 1698-1701 ◽  
Author(s):  
Yu Chen ◽  
Yunan Hu ◽  
Kun Hu Kou ◽  
Hai Jun Li ◽  
Gang Zhang
Keyword(s):  
Boundary Layer ◽  
Infrared Detection ◽  
Infrared Transmission ◽  
Horizontal Path ◽  
Atmospheric Window ◽  
Ocean Atmosphere ◽  
Slant Path ◽  
Atmospheric Transmittance ◽  
Total Transmittance ◽  
Major Absorption Band

Ocean atmospheric transmittance is an important factor to influence detecting distance of infrared system. The influence efficiency of infrared detection is studied by using modtran, on the basis of studying the character of infrared transmission. Firstly, major absorption band of vapor, carbon dioxide, ozone and vapor continuum and the change of transmittance in boundary layer, troposphere and stratosphere are analyzed. Secondly, atmospheric window transmittance of navy maritime aerosol in horizontal path and slant path is analyzed, and the influence of four types of maritime aerosol is also analyzed for navy maritime aerosol. Lastly, the influence of five model atmospheres to total transmittance is analyzed.

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