Infrared biosensors based on graphene plasmonics: modeling
Yuan Zhao1, Xiang Hu, Guanxiong Chen
1Department of Materials Science and Engineering and CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, 96 Jin Zhai Rd, Hefei 230026, China. zhuyanwu@ustc.edu.cn yllu@ustc.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|September 6, 2013
Summary
We developed a highly sensitive graphene biosensor using localized plasmons. This plasmon resonance sensor achieves 1697 nm/RIU sensitivity for biomolecule detection, tunable via graphene properties.
Area of Science:
- Plasmonics
- Biosensing
- Graphene-based devices
Background:
- Localized surface plasmons offer high sensitivity for detecting molecular interactions.
- Graphene's unique electronic properties make it a promising material for advanced biosensor platforms.
Purpose of the Study:
- To propose and numerically simulate a novel graphene-based biosensor.
- To investigate the sensitivity and tunability of plasmon resonance in graphene for biosensing applications.
Main Methods:
- Numerical simulations were employed to model the biosensor's performance.
- Localized plasmons in graphene were exploited, coupled with biomolecule adsorption.
- Sensitivity was measured by detecting wavelength shifts at plasmon resonance.
Main Results:
- The proposed biosensor achieved a high sensitivity of up to 1697 nm/RIU.
- Plasmon resonance wavelength is tunable via electrostatic doping and graphene structure modulation.
- The device exhibits wide-angle operation due to TM polarization independence from incident angles.
Conclusions:
- Graphene plasmonics provide a viable and highly sensitive platform for biosensing.
- The proposed biosensor design offers tunability and robust performance across various substrates and angles.
