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Optical notch filter with tunable bandwidth based on guided-mode resonant polarization-sensitive spectral feature
Optics Express
|July 21, 2015
Summary
This study introduces a novel tunable notch filter using guided-mode resonance. The device achieves tunable bandwidth from 8.6 nm to 18.2 nm via liquid crystal polarization control.
Area of Science:
- Photonics and Optical Engineering
- Nanophotonics
- Filter Technology
Background:
- Guided-mode resonance (GMR) filters offer unique spectral characteristics.
- Achieving tunable bandwidth in resonant filters remains a challenge.
Purpose of the Study:
- To propose and demonstrate a novel bandwidth-tunable notch filter.
- To leverage GMR effects and polarization sensitivity for tunable filtering.
Main Methods:
- Utilized the superposition of two GMR filters to create a notch.
- Employed a liquid crystal polarization rotator for precise polarization control.
- Investigated the spectra-to-polarization sensitivity of a 1D GMR filter.
Main Results:
- Demonstrated a compact, tunable notch filter with a fixed central wavelength of 766.4 nm.
- Achieved tunable full width at half maximum (FWHM) bandwidth from 8.6 nm to 18.2 nm.
- Verified the filter's operation through experimental demonstration.
Conclusions:
- The proposed GMR notch filter offers effective bandwidth tunability.
- Liquid crystal polarization control provides a simple and precise method for tuning.
- This technology has potential applications in optical signal processing and sensing.
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