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Brewster's angle silicon wafer terahertz linear polarizer
Antoine Wojdyla1, Guilhem Gallot
1Laboratoire d’Optique et Biosciences, École Polytechnique, CNRS, 91128 Palaiseau, France.
Optics Express
|September 22, 2011
Summary
We developed a low-cost terahertz linear polarizer using silicon wafers at Brewster's angle. This wide-band device offers high extinction ratios and low insertion loss, suitable for terahertz beam power control.
Area of Science:
- Optics and Photonics
- Terahertz (THz) Technology
Background:
- Terahertz (THz) technology requires efficient polarization components.
- Existing polarizers like wire-grid types have limitations.
Purpose of the Study:
- To introduce a novel, cost-effective terahertz linear polarizer.
- To evaluate the performance of a silicon wafer-based Brewster's angle polarizer.
Main Methods:
- Fabrication of a polarizer using stacked silicon wafers.
- Orienting the silicon stack at Brewster's angle for THz radiation.
- Performance characterization including extinction ratio, insertion loss, and temporal waveform analysis.
Main Results:
- The polarizer demonstrates wide-band operation.
- Achieved a high extinction ratio exceeding 6 × 10^3.
- Exhibited very low insertion losses below 1%.
- Confirmed no distortion in temporal pulse waveforms.
- Performance comparable to commercial wire-grid polarizers.
Conclusions:
- The Brewster's angle silicon wafer polarizer is a viable, cost-effective alternative.
- It offers excellent performance for terahertz applications.
- The polarizer can be effectively used for terahertz beam power control.
