scholarly journals Ultra-narrow-band terahertz perfect metamaterial absorber for refractive index sensing application

2020 ◽  
Vol 19 ◽  
pp. 103567 ◽  
Author(s):  
Dan Hu ◽  
Tianhua Meng ◽  
Hongyan Wang ◽  
Yongkang Ma ◽  
Qiaofen Zhu
Keyword(s):  
Refractive Index ◽  
Narrow Band ◽  
Metamaterial Absorber ◽  
Refractive Index Sensing ◽  
Perfect Metamaterial Absorber ◽  
Sensing Application

scholarly journals Perfect Absorption and Refractive-Index Sensing by Metasurfaces Composed of Cross-Shaped Hole Arrays in Metal Substrate

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 63
Author(s):  
Zhendong Yan ◽  
Chaojun Tang ◽  
Guohua Wu ◽  
Yumei Tang ◽  
Ping Gu ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Performance ◽  
Narrow Band ◽  
Label Free ◽  
Hybrid Mode ◽  
Perfect Absorption ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Silver Substrate ◽  
Hole Arrays

Achieving perfect electromagnetic wave absorption with a sub-nanometer bandwidth is challenging, which, however, is desired for high-performance refractive-index sensing. In this work, we theoretically study metasurfaces for sensing applications based on an ultra-narrow band perfect absorption in the infrared region, whose full width at half maximum (FWHM) is only 1.74 nm. The studied metasurfaces are composed of a periodic array of cross-shaped holes in a silver substrate. The ultra-narrow band perfect absorption is related to a hybrid mode, whose physical mechanism is revealed by using a coupling model of two oscillators. The hybrid mode results from the strong coupling between the magnetic resonances in individual cross-shaped holes and the surface plasmon polaritons on the top surface of the silver substrate. Two conventional parameters, sensitivity (S) and figure of merit (FOM), are used to estimate the sensing performance, which are 1317 nm/RIU and 756, respectively. Such high-performance parameters suggest great potential for the application of label-free biosensing.

scholarly journals Theoretical Investigation of a Simple Design of Triple-Band Terahertz Metamaterial Absorber for High-Q Sensing

2019 ◽  
Vol 9 (7) ◽  
pp. 1410 ◽  
Author(s):  
Tao Chen ◽  
Runyu Zhao ◽  
Ben-Xin Wang
Keyword(s):  
Refractive Index ◽  
Narrow Band ◽  
Metamaterial Absorber ◽  
Resonance Absorption ◽  
Simple Design ◽  
Perfect Absorption ◽  
High Q ◽  
Au Film ◽  
Resonance Modes ◽  
Triple Band

This paper presents a simple metamaterial design to achieve the triple-band near-perfect absorption response that can be used in the area of sensor application. The introduced absorber consists of an array of Au strip and a bulk flat Au film separated by an insulator dielectric layer. Three narrow-band resonance absorption peaks are obtained by superposing three different modes (a fundamental mode resonance and two high-order responses) of the Au strip. These resonance modes (in particular of the last two modes) have large sensitivity to the changes of the surrounding index, overlayer thickness and the refractive index of the overlayer.

Tunable narrow band perfect metamaterial absorber based on guided-mode resonance

2019 ◽  
Vol 33 (16) ◽  
pp. 1950171 ◽  
Author(s):  
Zhibin Ren ◽  
Yahui Sun ◽  
Shuqing Zhang ◽  
Zihao Lin ◽  
Chunyu Wang
Keyword(s):  
Narrow Band ◽  
Thin Film Deposition ◽  
Metamaterial Absorber ◽  
Visible Spectral Region ◽  
Film Deposition ◽  
Reflection Spectra ◽  
Guided Mode ◽  
Perfect Metamaterial Absorber ◽  
Guided Mode Resonance ◽  
Rigorous Coupled Wave

The tunable narrow band perfect metamaterial absorber (PMA) based on guided-mode resonance (GMR) for the visible spectral region is proposed. The PMA is composed of a one-dimensional grating layer, two waveguide layers and an Ag substrate. Tunable narrow band PMAs are designed using rigorous coupled-wave analysis by comparing the GMR effects for the filters and absorbers. Afterwards, two tunable PMA samples are fabricated through thin-film deposition and ultraviolet lithographic patterning. Finally, the reflection spectra of the fabricated PMA samples are measured. The absorption spectra obtained by subtracting the measured reflection spectra from 1 are consistent with the theory.

Highly modified spontaneous emissions in YVO4:Eu3+ inverse opal and refractive index sensing application

2012 ◽  
Vol 100 (8) ◽  
pp. 081104 ◽  
Author(s):  
Yongsheng Zhu ◽  
Wen Xu ◽  
Hanzhuang Zhang ◽  
Wei Wang ◽  
Liu Tong ◽  
...  
Keyword(s):  
Refractive Index ◽  
Inverse Opal ◽  
Refractive Index Sensing ◽  
Sensing Application ◽  
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