scholarly journals An Electrically Tunable Dual-Wavelength Refractive Index Sensor Based on a Metagrating Structure Integrating Epsilon-Near-Zero Materials

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2301
Author(s):  
Zhenya Meng ◽  
Hailin Cao ◽  
Run Liu ◽  
Xiaodong Wu
Keyword(s):  
Refractive Index ◽  
Indium Tin Oxide ◽  
Figure Of Merit ◽  
Refractive Index Sensor ◽  
Perfect Absorption ◽  
Metal Insulator ◽  
Sensing Platform ◽  
Highly Sensitive ◽  
Metal Insulator Metal ◽  
Epsilon Near Zero

In this paper, a reconfigurable sensing platform based on an asymmetrical metal-insulator-metal stacked structure integrating an indium tin oxide (ITO) ultrathin film is proposed and investigated numerically. The epsilon-near-zero (ENZ) mode and antisymmetric mode can be resonantly excited, generating near-perfect absorption of over 99.7% at 1144 and 1404 nm, respectively. The absorptivity for the ENZ mode can be modulated from 90.2% to 98.0% by varying the ENZ wavelength of ITO by applying different voltages. To obtain a highly sensitive biosensor, we show that the proposed structure has a full-width at half-maximum (FWHM) of 8.65 nm and a figure-of-merit (FOM) of 24.7 with a sensitivity of 213.3 nm/RI (refractive index) for the glucose solution. Our proposed device has potential for developing tunable biosensors for real-time health monitoring.

scholarly journals Dual Fano Resonances Induced by Rectangle-based Plasmonic Resonator for Refractive Index Nano-sensor

2021 ◽  
Vol 2125 (1) ◽  
pp. 012005
Author(s):  
Yang Zhang
Keyword(s):  
Refractive Index ◽  
Figure Of Merit ◽  
Important Application ◽  
Refractive Index Sensor ◽  
Fano Resonances ◽  
Metal Insulator ◽  
Metal Insulator Metal ◽  
Simulation Results ◽  
Photonic Circuit ◽  
Plasmonic Resonator

Abstract A tunable dual Fano-like plasmonic structure consisting of metal-insulator-metal (MIM), baffle and a rectangular cavity containing two identical rectangular metal blocks is obtained. Numerical simulation results show that there are dual Fano resonances in the transmission spectrum of the structure, which can be tuned by changing the geometric parameters of the structure. In addition, due to the apparent asymmetry of the Fano resonances, the system was developed as an effective refractive index sensor (RIS) with a sensitivity of 853 nm/RIU and figure of merit (FOM) of 1631. It is considered that this structure has important application value in high integrated photonic circuit.

scholarly journals Plasmonic Refractive Index Sensor Optimized for Color Detection

2021 ◽  
Author(s):  
Ahmad Azuad Yaseer ◽  
Md. Farhad Hassan ◽  
Infiter Tathfif ◽  
Kazi Sharmeen Rashid ◽  
Rakibul Hasan Sagor
Keyword(s):  
Refractive Index ◽  
Figure Of Merit ◽  
Structural Parameters ◽  
Color Filter ◽  
Refractive Index Sensor ◽  
Plasmonic Sensor ◽  
Metal Insulator ◽  
Initial Sensitivity ◽  
Metal Insulator Metal ◽  
Color Detection

Abstract In this paper, a six cavity-based metal-insulator-metal plasmonic sensor is proposed. The designed sensor can detect six primary colors in the visible wavelength. Moreover, the proposed sensor can also sense the change in the refractive index. An initial sensitivity of 648.41 nm/RIU and figure of merit of (FOM) 141.29 are found based on the transmittance profile extracted through the two-dimensional (2D) finite element method (FEM). The structural parameters are optimized to maximize the performance of the modeled device both as a color filter and a refractive index sensor. The optimized FOM, FOM* and sensitivity are recorded as 218.80, 4.771 × 10⁴, and 865.31 nm/RIU, respectively. Due to high FOM and FOM*, this sensor is expected to be utilized as a color filter in various sectors, such as medical, industrial, and forensic, where the light of a particular wavelength is mandatory.

scholarly journals Improved Refractive Index-Sensing Performance of Multimode Fano-Resonance-Based Metal-Insulator-Metal Nanostructures

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2097
Author(s):  
Yuan-Fong Chou Chau ◽  
Chung-Ting Chou Chao ◽  
Siti Zubaidah Binti Haji Jumat ◽  
Muhammad Raziq Rahimi Kooh ◽  
Roshan Thotagamuge ◽  
...  
Keyword(s):  
Refractive Index ◽  
Plasmon Resonance ◽  
Fano Resonance ◽  
High Sensitivity ◽  
Metal Nanostructures ◽  
Refractive Index Sensor ◽  
Metal Insulator ◽  
Wide Range ◽  
Metal Insulator Metal ◽  
Mode 2

This work proposed a multiple mode Fano resonance-based refractive index sensor with high sensitivity that is a rarely investigated structure. The designed device consists of a metal–insulator–metal (MIM) waveguide with two rectangular stubs side-coupled with an elliptical resonator embedded with an air path in the resonator and several metal defects set in the bus waveguide. We systematically studied three types of sensor structures employing the finite element method. Results show that the surface plasmon mode’s splitting is affected by the geometry of the sensor. We found that the transmittance dips and peaks can dramatically change by adding the dual air stubs, and the light–matter interaction can effectively enhance by embedding an air path in the resonator and the metal defects in the bus waveguide. The double air stubs and an air path contribute to the cavity plasmon resonance, and the metal defects facilitate the gap plasmon resonance in the proposed plasmonic sensor, resulting in remarkable characteristics compared with those of plasmonic sensors. The high sensitivity of 2600 nm/RIU and 1200 nm/RIU can simultaneously achieve in mode 1 and mode 2 of the proposed type 3 structure, which considerably raises the sensitivity by 216.67% for mode 1 and 133.33% for mode 2 compared to its regular counterpart, i.e., type 2 structure. The designed sensing structure can detect the material’s refractive index in a wide range of gas, liquids, and biomaterials (e.g., hemoglobin concentration).

scholarly journals Refractive index sensor and filter of metal-insulator-metal waveguide based on ring resonator embedded by cross structure

2018 ◽  
Vol 67 (19) ◽  
pp. 197301
Author(s):  
Qi Yun-Ping ◽  
Zhang Xue-Wei ◽  
Zhou Pei-Yang ◽  
Hu Bing-Bing ◽  
Wang Xiang-Xian
Keyword(s):  
Refractive Index ◽  
Ring Resonator ◽  
Refractive Index Sensor ◽  
Metal Insulator ◽  
Metal Waveguide ◽  
Metal Insulator Metal ◽  
Cross Structure

scholarly journals Highly Sensitive and Tunable Plasmonic Sensor Based on a Nanoring Resonator with Silver Nanorods

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1399 ◽  
Author(s):  
Chung-Ting Chou Chao ◽  
Yuan-Fong Chou Chau ◽  
Hung Ji Huang ◽  
N. T. R. N. Kumara ◽  
Muhammad Raziq Rahimi Kooh ◽  
...  
Keyword(s):  
Refractive Index ◽  
System Response ◽  
Refractive Index Sensor ◽  
Plasmonic Sensor ◽  
Refractive Index Sensitivity ◽  
Silver Nanorods ◽  
Metal Waveguide ◽  
Highly Sensitive ◽  
Metal Insulator Metal ◽  
Index Sensitivity

We numerically and theoretically investigate a highly sensitive and tunable plasmonic refractive index sensor that is composed of a metal-insulator-metal waveguide with a side-coupled nanoring, containing silver nanorods using the finite element method. Results reveal that the presence of silver nanorods in the nanoring has a significant impact on sensitivity and tunability performance. It gives a flexible way to tune the system response in the proposed structure. Our designed sensor has a sensitivity of 2080 nm/RIU (RIU is the refractive index unit) along with a figure of merit and a quality factor of 29.92 and 29.67, respectively. The adequate refractive index sensitivity can increase by adding the silver nanorods in a nanoring, which can induce new surface plasmon polaritons (SPPs) modes that cannot be found by a regular nanoring. For a practical application, a valid introduction of silver nanorods in the nanoring can dramatically reduce the dimension of the proposed structure without sacrificing performance.

scholarly journals Refractive Index Sensor Based on Fano Resonances in Metal-Insulator-Metal Waveguides Coupled with Resonators

Sensors ◽  
2017 ◽  
Vol 17 (4) ◽  
pp. 784 ◽  
Author(s):  
Yue Tang ◽  
Zhidong Zhang ◽  
Ruibing Wang ◽  
Zhenyin Hai ◽  
Chenyang Xue ◽  
...  
Keyword(s):  
Refractive Index ◽  
Refractive Index Sensor ◽  
Fano Resonances ◽  
Metal Insulator ◽  
Metal Insulator Metal

Refractive-Index Sensor Based on Metal-Insulator-Metal Waveguides

2015 ◽  
Vol 742 ◽  
pp. 46-49 ◽  
Author(s):  
Ting Ting Tang ◽  
Li Luo
Keyword(s):  
Refractive Index ◽  
Refractive Index Change ◽  
Dielectric Materials ◽  
Refractive Index Sensor ◽  
Total Size ◽  
Metal Insulator ◽  
Coupled Mode ◽  
Metal Insulator Metal ◽  
Structure Of Metal ◽  
Propagation Properties

We propose a refractive sensor based on directional coupling between two metal-insulator-metal (MIM) waveguides to measure the refractive index change of the insulator, which is designed to be with a structure of metal-insulator-metal-insulator-metal (MIMIM) in which surface plasmon waves (SPW) are excited. The propagation properties are analyzed by coupled mode theory, and the expressions about the coupling coefficient, coupling length and sensitivity are derived. The sensing properties based on simulation results are also discussed. Compared with a dielectric waveguide, the total size of our sensor with MIMIM waveguide is about one tenth that with dielectric materials, while the sensitivity is improved ten times larger than the former.

Sign in / Sign up

Export Citation Format

Share Document