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Updated: Jul 10, 2026
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
15.4K
Sub-terahertz silicon-based on-chip absorption spectroscopy using thin-film model for biological applications.
Seyed Ali Hosseini Farahabadi1, Milad Entezami2, Hesam Abouali3
1Centre for Intelligent Antenna and Radio Systems (CIARS), Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, N2L 3G1, Canada. a.hosseini@uwaterloo.ca.
Scientific Reports
|October 23, 2022
Summary
This study introduces a novel silicon chip for sub-terahertz (sub-THz) spectroscopy, enabling compact and cost-effective biomolecule characterization. The on-chip platform achieves high-resolution measurements, paving the way for advanced biosensors.
Area of Science:
- Biophysics and Spectroscopy
- Materials Science and Engineering
- Nanotechnology and Biosensing
Background:
- Terahertz (THz) spectroscopy is crucial for studying picosecond dynamics of biomolecules.
- Traditional free-space THz spectrometers face limitations in functionality, signal-to-noise ratio, and setup complexity.
- On-chip spectrometers offer potential for integrated, compact, and low-cost THz spectroscopy.
Purpose of the Study:
- To propose and demonstrate a low-loss silicon-based platform for on-chip sub-terahertz (sub-THz) spectroscopy.
- To enable the characterization of nano-scale biomolecules in the G-band (0.14-0.22 THz).
- To develop an electromagnetic thin-film model for accounting for biomolecule loading effects.
Main Methods:
- Fabrication of a functionalized silicon chip using a single-mask micro-fabrication process.
- Immobilization of biomolecules (dehydrated streptavidin and immunoglobulin antibody) onto the silicon chip.
- Measurement of the platform using a vector network analyzer (VNA) for high dynamic range and spectral resolution.
Main Results:
- Demonstration of the ability to characterize low-loss nano-scale biomolecules across the G-band.
- Introduction and application of an electromagnetic thin-film model to analyze biomolecule loading effects.
- Successful fabrication and measurement of the proposed planar platform.
Conclusions:
- The proposed silicon-based platform enables low-loss, cost-effective, and integrated sub-THz spectroscopy.
- This technology paves the way for advanced biosensors for biomolecule detection and characterization.
- The platform's general design supports future development in integrated THz biosensing applications.
