Near-infrared embedded metamaterial composed of circular ring resonator with wire strip topology for free-space applications

2016 ◽  
Author(s):  
Ozan T Gunduz ◽  
Cumali Sabah ◽  
Erich Leitgeb
Keyword(s):  
Free Space ◽  
Near Infrared ◽  
Ring Resonator ◽  
Circular Ring ◽  
Space Applications

scholarly journals Low-Noise InGaAs/InP Single-Photon Avalanche Diodes for Fiber-Based and Free-Space Applications

2021 ◽  
pp. 1-1
Author(s):  
Fabio Signorelli ◽  
Fabio Telesca ◽  
Enrico Conca ◽  
Adriano Della Frera ◽  
Alessandro Ruggeri ◽  
...  
Keyword(s):  
Free Space ◽  
Single Photon ◽  
Low Noise ◽  
Space Applications ◽  
Avalanche Diodes ◽  
Single Photon Avalanche Diodes

scholarly journals Controlling Refraction Using Sub-Wavelength Resonators

2018 ◽  
Vol 8 (10) ◽  
pp. 1942
Author(s):  
Yue Chen ◽  
Robert Lipton
Keyword(s):  
Frequency Dependence ◽  
Free Space ◽  
Near Infrared ◽  
Center Frequency ◽  
Negative Index ◽  
Index Properties ◽  
Frequency Bands ◽  
Transmitted Signal ◽  
Sub Wavelength

We construct metamaterials from sub-wavelength nonmagnetic resonators and consider the refraction of incoming signals traveling from free space into the metamaterial. We show that the direction of the transmitted signal is a function of its center frequency and bandwidth. The directionality of the transmitted signal and its frequency dependence is shown to be explicitly controlled by sub-wavelength resonances that can be calculated from the geometry of the sub-wavelength scatters. We outline how to construct a medium with both positive and negative index properties across different frequency bands in the near infrared and optical regime.

Evaluation of the Equivalent Lumped Element Parameters of Modified Microstrip Ring Resonator

2015 ◽  
Vol 735 ◽  
pp. 278-281
Author(s):  
Yi Lung Then ◽  
Kok Yeow You ◽  
Mohamad Ngasri Dimon ◽  
Wei Ying Lai
Keyword(s):  
Magnetic Field ◽  
Free Space ◽  
Ring Resonator ◽  
Element Model ◽  
Network Analyzer ◽  
Simulation Data ◽  
Lumped Element ◽  
Lumped Element Model ◽  
Microstrip Ring ◽  
Microstrip Ring Resonator

Microstrip ring resonator (MRR) sensor was modeled by simple equivalent lumped element circuits in free space based on simulation data obtained from Microwave Office (AWR) simulator and comparison was made with the measurements using the E5071C Network Analyzer. The calculated reflection coefficient, |G| and complex input impedanceZinusing lumped element model were compared with the measurements results. Both results showed well agreement with a little discrepancy, basically due to imperfect soldering. The MRR was designed to have operating frequencies between 0.5 GHz and 4.5 GHz. The maximum surrounding of magnetic field,Hϕis within 15 A/m in free space.

Field experiment and analysis for free-space laser transmission characteristic in turbulent path based on MWIR and NIR

2020 ◽  
Vol 34 (14) ◽  
pp. 2050148
Author(s):  
Wei Wang ◽  
Zhaofeng Bai ◽  
Xiaoping Xie ◽  
Haiping Mei ◽  
Wei Zhao
Keyword(s):  
Free Space ◽  
Background Noise ◽  
Communication Systems ◽  
Near Infrared ◽  
Transmission Characteristic ◽  
Free Space Optical ◽  
Atmospheric Attenuation ◽  
Atmospheric Transmission ◽  
Experimental Scheme ◽  
Quality Signals

It is hard to achieve low bit error rate (BER) and high-quality signals in free-space optical (FSO) communication systems due to atmospheric link interference. For the sake of seeking solutions, we proposed an experimental scheme of free-space laser communication based on middle-wave infrared (MWIR) and near infrared (NIR) for obtaining atmospheric transmission characteristic in 1 km turbulence path. Compared with NIR waveband, MWIR-based scheme is more suitable for atmospheric FSO communication since it owns higher anti-interference ability for atmospheric attenuation, turbulence and skylight background noise. The experimental results may offer a significant reference for FSO communication in atmosphere link.

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