A Novel Miniaturized Vivaldi Antenna Using Tapered Slot Edge With Resonant Cavity Structure for Ultrawideband Applications

2016 ◽  
Vol 15 ◽  
pp. 1881-1884 ◽  
Author(s):  
Yushun Liu ◽  
Wenjun Zhou ◽  
Shijie Yang ◽  
Weihao Li ◽  
Pengfei Li ◽  
...  
Keyword(s):  
Resonant Cavity ◽  
Cavity Structure ◽  
Vivaldi Antenna

scholarly journals High Sensitivity And Ultra-High Quality Factor For An All-Optical Temperature Sensor Based On Photonic Crystal Technology

2021 ◽  
Author(s):  
Kouddad Elhachemi ◽  
Naoum Rafah ◽  
Dekkiche Leila
Keyword(s):  
Photonic Crystal ◽  
Quality Factor ◽  
Temperature Sensor ◽  
Resonant Cavity ◽  
Fdtd Method ◽  
Transmission Efficiency ◽  
High Quality Factor ◽  
High Quality ◽  
Compact Size ◽  
Cavity Structure

Abstract In our work, we propose a novel temperature sensor design based on a two-dimensional (2D) photonic crystal resonant cavity structure designed to detect and monitor temperature under very harsh environmental conditions from 0 °C to 500 ºC. The sensitivity of the proposed structure is 109.8 pm/ºC, an ultra-high quality factor, high transmission efficiency and ultra-compact size. The characteristics of the proposed sensor under different temperatures are simulated using the Plane Wave Expansion (PWE) method and Finite Difference Time Domain (FDTD) method to calculate, respectively, the Photonic Band Gap (PBG) and transmission efficiency. The results obtained show that the wavelength of the resonant cavity increases linearly with increasing temperature. Our sensor is suitable for applications based on nanotechnology.

Coherent control of thermal emission from SiC due to coupled resonant cavity structure

2008 ◽  
Author(s):  
Nir Dahan ◽  
Avi Niv ◽  
Gabriel Biener ◽  
Yuri Gorodetski ◽  
Vladimir Kleiner ◽  
...  
Keyword(s):  
Coherent Control ◽  
Thermal Emission ◽  
Resonant Cavity ◽  
Cavity Structure

scholarly journals Designing Optically & Utilization of Thermopile Chip with Resonant Cavity Absorber Structure as IR Absorber

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 302
Author(s):  
Haigang Hou ◽  
Jian Yang ◽  
Guiwu Liu ◽  
Junlin Liu ◽  
Mudassar Abbas ◽  
...  
Keyword(s):  
Infrared Absorption ◽  
Duty Cycle ◽  
Dielectric Layer ◽  
Metal Layer ◽  
Optical Design ◽  
Resonant Cavity ◽  
Cavity Structure ◽  
Calculation Results ◽  
Absorber Structure ◽  
Suspension Structure

This paper presents a novel thermopile chip in which the resonant cavity structure was fully utilized as an absorber by an optical design. The resonant cavity absorber structure was designed using Al as anthe bottom reflective metal layer, air as the intermediate dielectric layer, and SiO2/TiN/Si3N4 sandwich layers as the top absorption layer, while the bottom reflective metal (Al) was deposited on the cold junctions of the thermopile. The simulation and calculation results show that the thermopile chip with resonant cavity absorber structure not only has great infrared absorption in the wide infrared absorption range but also can effectively prevent the cold junctions from absorbing infrared radiation and inhibit the rise of temperature. As a result, the temperature difference between the hot junctions and the cold junctions is increased, and the responsivity of the thermopile chip is further improved. Moreover, the duty cycle of the thermopile chip is greatly improved due to the double-layer suspension structure. Compared with the traditional thermopile chip structure, the sizes of the thermopile chip with the resonant cavity absorber structure can be further reduced while maintaining responsivity and specific detectivity.

scholarly journals InGaN Resonant-Cavity Light-Emitting Diodes with Porous and Dielectric Reflectors

2020 ◽  
Vol 11 (1) ◽  
pp. 8
Author(s):  
Cheng-Jie Wang ◽  
Ying Ke ◽  
Guo-Yi Shiu ◽  
Yi-Yun Chen ◽  
Yung-Sen Lin ◽  
...  
Keyword(s):  
Active Layer ◽  
Optical Pumping ◽  
Light Emitting Diode ◽  
Resonant Cavity ◽  
Bragg Reflector ◽  
Distributed Bragg Reflector ◽  
Central Wavelength ◽  
Light Emitting ◽  
Pl Spectra ◽  
Cavity Structure

InGaN based resonant-cavity light-emitting diode (RC-LED) structures with an embedded porous-GaN/n-GaN distributed Bragg reflector (DBR) and a top dielectric Ta2O5/SiO2 DBR were demonstrated. GaN:Si epitaxial layers with high Si-doping concentration (n+-GaN:Si) in the 20-period n+-GaN/n-GaN stacked structure were transformed into a porous-GaN/n-GaN DBR structure through the doping-selective electrochemical wet etching process. The central wavelength and reflectivity were measured to be 434.3 nm and 98.5% for the porous DBR and to be 421.3 nm and 98.1% for the dielectric DBR. The effective 1λ cavity length at 432nm in the InGaN resonant-cavity consisted of a 30 nm-thick Ta2O5 spacer and a 148 nm-thick InGaN active layer that was analyzed from the angle-resolved photoluminescence (PL) spectra. In the optical pumping PL spectra, non-linear emission intensity and linewidths reducing effect, from 6.5 nm to 0.7 nm, were observed by varying the laser pumping power. Directional emission pattern and narrow linewidth were observed in the InGaN active layer with bottom porous DBR, top dielectric DBR, and the optimum spacer layer to match the short cavity structure.

Enhanced Coherency of Thermal Emission From SiC by Coupled Resonant Cavity Structure

2008 ◽  
Author(s):  
Nir Dahan ◽  
Avi Niv ◽  
Yuri Gorodetski ◽  
Vladimir Kleiner ◽  
Erez Hasman
Keyword(s):  
Surface Waves ◽  
Thermal Emission ◽  
Near Field ◽  
Resonant Cavity ◽  
Spatial Coherence ◽  
Support Surface ◽  
Amorphous Sio2 ◽  
Coherent Coupling ◽  
Cavity Structure ◽  
Order Of Magnitude

Surface waves have been shown to play a key role in spontaneous thermal emission in the near-field as well as the coherence and the polarization properties of the nonradiative field. The near-field coherence of the delocalized nonradiative surface waves can be transferred into radiative fields by introducing a shallow grating on the surface. We show that the coherency of the thermal radiation can be enhanced by an order of magnitude compared with the coherency imposed by the delocalized surface waves. The enhanced coherency is due to coherent coupling between resonant cavities obtained by surface standing waves, where each cavity supports localized field that is attributed to coupled surface waves. We realized coupled resonant cavity structure on amorphous SiO2 and crystalline SiC, both support surface phonon-polaritons, to demonstrate extraordinary coherent thermal emission with a high quality factor of 600 and a spatial coherence length of 760λ.

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