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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
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Terahertz Plasmonic Sensor Based on Metal-Insulator Composite Woven-Wire Mesh.
Ja-Yu Lu1, Po-Lun Chen1, Borwen You2,3
1Department of Photonics, National Cheng Kung University, No. 1 University Road, Tainan 70101, Taiwan.
Biosensors
|September 23, 2022
Summary
A novel 3D plasmonic sensor using metal-coated woven-wire mesh (MCWM) enhances terahertz (THz) spectroscopy for label-free detection of trace biochemicals. This MCWM platform achieves femtomolar sensitivity, surpassing existing metallic mesh devices for microanalysis.
Area of Science:
- Plasmonics
- Terahertz Spectroscopy
- Biosensing
Background:
- Terahertz (THz) spectroscopy is effective for label-free, nondestructive biochemical sensing via roto-vibrational transitions.
- Conventional THz systems lack sensitivity for minute samples due to far-field detection and low absorption cross-sections.
- Need for enhanced sensitivity in THz spectroscopy for trace analyte detection.
Purpose of the Study:
- To demonstrate a 3D plasmonic structure based on metal-coated woven-wire mesh (MCWM) for enhanced THz spectroscopy.
- To enable sensitive detection of trace amounts of analytes.
- To develop a label-free microanalysis sensor platform.
Main Methods:
- Experimental and numerical demonstration of a 3D MCWM plasmonic structure.
- Utilized finite element simulations to analyze field enhancement and localization.
- Tested sensing capabilities with various analytes: PAA membranes, microparticles, and PBS salts.
Main Results:
- MCWM exhibited dual sharp spectral features due to resonant THz surface electromagnetic modes.
- Enhanced and localized surface fields at metal gaps led to significant resonant dip shifts.
- Achieved high sensitivities (8.26 GHz/μm thickness, 547 GHz/RIU refractive index) and femtomolar detection limits for PAA.
Conclusions:
- The MCWM sensor significantly improves THz spectroscopy sensitivity for trace analyte detection.
- Demonstrated capabilities in identifying different analytes with high precision.
- Presents a rapid, inexpensive, and simple platform for label-free microanalysis, potentially leading to next-generation sensors.
