High-sensitivity silicon-based photonic crystal refractive index biosensor based on defect-mode coupling

2018 ◽  
Vol 427 ◽  
pp. 409-417 ◽  
Author(s):  
Chao Wu ◽  
Xing Liu ◽  
Shuai Feng ◽  
Xiao Chen ◽  
Chuanbo Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Mode Coupling ◽  
Defect Mode ◽  
High Sensitivity ◽  
Silicon Based

scholarly journals High Sensitivity Terahertz Biosensor Based on Mode Coupling of a Graphene/Bragg Reflector Hybrid Structure

Biosensors ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 377
Author(s):  
Yamei Liu ◽  
Qiwen Zheng ◽  
Hongxia Yuan ◽  
Shenping Wang ◽  
Keqiang Yin ◽  
...  
Keyword(s):  
Refractive Index ◽  
Mode Coupling ◽  
Defect Mode ◽  
High Sensitivity ◽  
Hybrid Structure ◽  
Transmission Peak ◽  
Bragg Reflector ◽  
Highly Sensitive ◽  
Specific Parameter ◽  
Resonance Transmission

In this work, a high-sensitivity terahertz (THz) biosensor is achieved by using a graphene/Bragg reflector hybrid structure. This high-sensitivity THz biosensor is developed from the sharp Fano resonance transmission peak created by coupling the graphene Tamm plasmons (GTPs) mode to a defect mode. It is found that the proposed THz biosensor is highly sensitive to the Fermi energy of graphene, as well as the thickness and refractive index of the sensing medium. Through specific parameter settings, the composite structure can achieve both a liquid biosensor and a gas biosensor. For the liquid biosensor, the maximum sensitivity of >1000°/RIU is obtained by selecting appropriate parameters. We believe the proposed layered hybrid structure has the potential to fabricate graphene-based high-sensitivity biosensors.

Splitting and Filtering Properties of Defect-Mode in One-Dimensional Photonic Crystal

2013 ◽  
Vol 760-762 ◽  
pp. 378-382
Author(s):  
Jian Kun Peng ◽  
Yan Ling Han ◽  
Hong Wang
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Mode Coupling ◽  
Incident Angle ◽  
Defect Mode ◽  
Defect Modes ◽  
One Dimensional ◽  
Mode Split ◽  
Spacing Interval ◽  
Coupling Mode

By the Transfer Matrix Method (TMM), the properties of defect modes, such as splitting, coupling and filtering, have been researched in detail. The influence of refractive index and incident angle on the defect-mode coupling has been investigated. Simulating results exhibit that coupling mode split as two defect modes when they are close to each other. This property is closely related to the refractive index and the spacing interval between defect layers. The incident angle can reach 30 degree, which has a potential application in full angle filtering.

scholarly journals Multi-slot photonic crystal cavities for high-sensitivity refractive index sensing

2019 ◽  
Vol 27 (3) ◽  
pp. 3609 ◽  
Author(s):  
Peipeng Xu ◽  
Jiajiu Zheng ◽  
Jun Zhou ◽  
Yueyang Chen ◽  
Chen Zou ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
High Sensitivity ◽  
Photonic Crystal Cavities ◽  
Refractive Index Sensing

scholarly journals High Sensitivity Photonic Crystal Fiber Refractive Index Sensor with Gold Coated Externally Based on Surface Plasmon Resonance

Micromachines ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 640 ◽  
Author(s):  
Xudong Li ◽  
Shuguang Li ◽  
Xin Yan ◽  
Dongming Sun ◽  
Zheng Liu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
High Sensitivity ◽  
Refractive Index Sensor ◽  
Crystal Fiber ◽  
Air Hole

In this paper we propose a gold-plated photonic crystal fiber (PCF) refractive index sensor based on surface plasmon resonance (SPR), in which gold is coated on the external surface of PCF for easy fabrication and practical detection. The finite element method (FEM) is used for the performance analysis, and the numerical results show that the thickness of the gold film, the refractive index of the analyte, the radius of the air hole in the first layer, the second layer, and the central air hole can affect the sensing properties of the sensor. By optimizing the sensor structure, the maximum wavelength sensitivity can reach 11000 nm/RIU and the maximum amplitude sensitivity can reach 641 RIU−1. Due to its high sensitivity, the proposed sensor can be used for practical biological and chemical sensing.

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