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Reconfigurable and dual-polarization Bragg grating filter with phase change materials
Applied Optics
|November 22, 2021
Summary
This study introduces a novel reconfigurable optical filter using a subwavelength grating and phase change material. It demonstrates significant wavelength tuning for dual-polarization light, crucial for advanced photonic systems.
Area of Science:
- Photonics and Optical Engineering
- Materials Science for Photonics
- Integrated Optics
Background:
- Reconfigurable optical filters are essential for flexible photonic networks.
- Existing filters often face limitations in tunability, polarization dependence, or loss.
- Phase change materials offer promising avenues for dynamic optical control.
Purpose of the Study:
- To propose and numerically analyze a novel reconfigurable and dual-polarization optical filter.
- To leverage subwavelength gratings and phase change materials for enhanced filter performance.
- To explore the filter's potential in advanced optical communication and signal processing systems.
Main Methods:
- Design of a subwavelength grating waveguide filter.
- Integration of the low-loss phase change material Germanium-Antimony-Tellurium (Ge2Sb2Se4Te1).
- Numerical simulations employing effective medium theory to analyze Bragg reflection and crystallization.
Main Results:
- Achieved up to 20 nm (TE) and 17 nm (TM) redshift in Bragg reflection wavelength.
- Demonstrated low amplitude modulation of 6 dB (TE) and 0.15 dB (TM) at 1550 nm.
- Characterized six-level crystallization performance of the optical filter.
Conclusions:
- The proposed filter offers reconfigurable and dual-polarization operation.
- It presents a promising solution for dynamic wavelength tuning in photonic systems.
- Potential applications include wavelength-division-multiplexing, optical signal processing, and communications.
