Enhancing refractive index sensing capability with hybrid plasmonic–photonic absorbers

2015 ◽  
Vol 3 (17) ◽  
pp. 4222-4226 ◽  
Author(s):  
Zhengqi Liu ◽  
Meidong Yu ◽  
Shan Huang ◽  
Xiaoshan Liu ◽  
Yan Wang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Figure Of Merit ◽  
Normal Incidence ◽  
Refractive Index Sensor ◽  
Perfect Absorber ◽  
Refractive Index Sensing ◽  
Absorption Contrast

A significantly enhanced refractive index sensor with a maximum figure of merit (FOM*) value of about 1337 has been demonstrated based on a hybrid plasmonic–photonic absorberviautilizing substantial absorption contrast between a perfect absorber (∼99% at normal incidence) and a non-perfect absorber when there are changes in the surrounding.

scholarly journals Dual-Band Plasmonic Perfect Absorber Based on Graphene Metamaterials for Refractive Index Sensing Application

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 443 ◽  
Author(s):  
Zao Yi ◽  
Cuiping Liang ◽  
Xifang Chen ◽  
Zigang Zhou ◽  
Yongjian Tang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Figure Of Merit ◽  
Medical Diagnostics ◽  
Dual Band ◽  
Perfect Absorber ◽  
Plasmonic Sensor ◽  
Refractive Index Sensing ◽  
Potential Applications ◽  
Maximal Absorption ◽  
Sensing Application

We demonstrate a dual-band plasmonic perfect absorber (PA) based on graphene metamaterials. Two absorption peaks (22.5 μm and 74.5 μm) with the maximal absorption of 99.4% and 99.9% have been achieved, respectively. We utilize this perfect absorber as a plasmonic sensor for refractive index (RI) sensing. It has the figure of merit (FOM) of 10.8 and 3.2, and sensitivities of about 5.6 and 17.2 μm/RIU, respectively. Hence, the designed dual-band PA-based RI sensor exhibits good sensing performance in the infrared regime, which offers great potential applications in various biomedical, tunable spectral detecting, environmental monitoring and medical diagnostics.

scholarly journals Fabry–Perot Resonance in 2D Dielectric Grating for Figure of Merit Enhancement in Refractive Index Sensing

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 4958
Author(s):  
Suejit Pechprasarn ◽  
Suvicha Sasivimolkul ◽  
Phitsini Suvarnaphaet
Keyword(s):  
Thin Film ◽  
Refractive Index ◽  
Figure Of Merit ◽  
Index Theory ◽  
Performance Comparison ◽  
Refractive Index Sensor ◽  
Resonant Condition ◽  
Refractive Index Sensing ◽  
Dielectric Grating ◽  
Fabry Perot

We have recently reported in our previous work that one-dimensional dielectric grating can provide an open structure for Fabry–Perot mode excitation. The grating gaps allow the sample refractive index to fill up the grating spaces enabling the sample to perturb the Fabry–Perot mode resonant condition. Thus, the grating structure can be utilized as a refractive index sensor and provides convenient sample access from the open end of the grating with an enhanced figure of merit compared to the other thin-film technologies. Here, we demonstrate that 2D grating structures, such as rectangular pillars and circular pillars, can further enhance refractive index sensing performance. The refractive index theory for rectangular pillars and circular pillars are proposed and validated with rigorous coupled wave theory. An effective refractive index theory is proposed to simplify the 2D grating computation and accurately predict the Fabry–Perot mode positions. The 2D gratings have more grating space leading to a higher resonant condition perturbation and sensitivity. They also provide narrower Fabry–Perot mode reflectance dips leading to a 4.5 times figure of merit enhancement than the Fabry–Perot modes excited in the 1D grating. The performance comparison for thin-film technologies for refractive index sensing is also presented and discussed.

Three-band perfect absorber with high refractive index sensing based on active tunable Dirac semimetal

2021 ◽  
Author(s):  
Zhiyou Li ◽  
Zao Yi ◽  
Tinting Liu ◽  
Li Liu ◽  
Xifang Chen ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Refractive Index ◽  
Gold Layer ◽  
Perfect Absorber ◽  
Refractive Index Sensing ◽  
Dirac Semimetal

In this paper, we designed a three-band narrowband perfect absorber based on Bulk Dirac semimetallic (BDS) metamaterials. The absorber consists of a hollow Dirac semimetallic layer above, a gold layer...

scholarly journals Analysis of Effects of Surface Roughness on Sensing Performance of Surface Plasmon Resonance Detection for Refractive Index Sensing Application

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6164
Author(s):  
Treesukon Treebupachatsakul ◽  
Siratchakrit Shinnakerdchoke ◽  
Suejit Pechprasarn
Keyword(s):  
Surface Roughness ◽  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Figure Of Merit ◽  
Root Mean Square Roughness ◽  
Performance Parameters ◽  
Refractive Index Sensing ◽  
Sensing Performance

This paper provides a theoretical framework to analyze and quantify roughness effects on sensing performance parameters of surface plasmon resonance measurements. Rigorous coupled-wave analysis and the Monte Carlo method were applied to compute plasmonic reflectance spectra for different surface roughness profiles. The rough surfaces were generated using the low pass frequency filtering method. Different coating and surface treatments and their reported root-mean-square roughness in the literature were extracted and investigated in this study to calculate the refractive index sensing performance parameters, including sensitivity, full width at half maximum, plasmonic dip intensity, plasmonic dip position, and figure of merit. Here, we propose a figure-of-merit equation considering optical intensity contrast and signal-to-noise ratio. The proposed figure-of-merit equation could predict a similar refractive index sensing performance compared to experimental results reported in the literature. The surface roughness height strongly affected all the performance parameters, resulting in a degraded figure of merit for surface plasmon resonance measurement.

Infrared non-planar plasmonic perfect absorber for enhanced sensitive refractive index sensing

2016 ◽  
Vol 53 ◽  
pp. 195-200 ◽  
Author(s):  
Yongzhi Cheng ◽  
Xue Song Mao ◽  
Chenjun Wu ◽  
Lin Wu ◽  
RongZhou Gong
Keyword(s):  
Refractive Index ◽  
Perfect Absorber ◽  
Refractive Index Sensing
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