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Biosensing on a Plasmonic Dual-Band Perfect Absorber Using Intersection Nanostructure.
Chung-Ting Chou Chao1, Yuan-Fong Chou Chau2, Hai-Pang Chiang1
1Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, Taiwan.
ACS Omega
|January 17, 2022
Summary
This study introduces a novel perfect plasmonic absorber (PPA) for sensitive biosensing. The PPA demonstrates high dual-band absorptance and potential for detecting cancerous and diabetes cells.
Area of Science:
- Plasmonics
- Optical Engineering
- Biomedical Sensing
Background:
- Integrated optical circuits require efficient optical absorbers, particularly in the visible and near-infrared (NIR) spectrum.
- Developing absorbers with multiple absorption channels presents a significant challenge.
Purpose of the Study:
- To propose and analyze a novel perfect plasmonic absorber (PPA) for sensitive biosensing applications.
- To investigate the physical mechanisms behind the absorber's performance using simulations.
Main Methods:
- Utilized finite element method (FEM) simulations.
- Analyzed absorptance spectrum, electric and magnetic field intensities, and surface charge distribution.
- Designed a PPA unit cell featuring a closed loop and a linked intersection.
Main Results:
- Achieved triple absorption channels with dual-band absorptance of 99.64% and 99.00%.
- Demonstrated high sensitivity of 1000.00 nm/RIU (mode 1) and 650 nm/RIU (mode 2).
- Observed strong electric and magnetic field coupling due to mutual inductance and capacitive coupling.
Conclusions:
- The designed PPA shows promise for sensitive biosensing applications, including detecting cancerous and diabetes cells.
- The structure's strong field coupling enhances its performance as an optical device.
