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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
Strain induced tunable wavelength filters based on flexible polymer waveguide Bragg reflector
Kyung-Jo Kim1, Jun-Kyu Seo, Min-Cheol Oh
1Department of Electronic Engineering, Pusan National University, Pusan (Busan), 609-735, Republic of Korea.
Optics Express
|June 11, 2008
Summary
Researchers developed a flexible polymer waveguide filter that tunes wavelength by stretching. This tunable wavelength filter offers wider tuning range than silica fiber, enabling new optical applications.
Area of Science:
- Photonics and optical engineering
- Materials science and engineering
Background:
- Developing tunable optical filters is crucial for advanced photonic applications.
- Existing tunable filters often face limitations in tuning range and material compatibility.
Purpose of the Study:
- To demonstrate a tunable wavelength filter using a strain-engineered polymeric Bragg reflection waveguide.
- To investigate the tuning capabilities and material properties of flexible polymer-based optical devices.
Main Methods:
- Fabrication of a polymeric Bragg reflection waveguide on a flexible substrate using a post lift-off process and an absorbing layer.
- Application of controlled strain to the flexible waveguide to induce wavelength tuning.
- Characterization of the Bragg reflection spectrum and wavelength shift under varying strain levels.
Main Results:
- The flexible Bragg reflector exhibited a narrow bandwidth, indicating uniform grating fabrication.
- Continuous tuning of the Bragg reflection wavelength up to 45 nm was achieved with a maximum strain of 31,690 μɛpsilon.
- A linear relationship between wavelength shift and applied strain was observed.
Conclusions:
- The flexible polymer waveguide demonstrates a highly tunable wavelength filter with a significantly wider tuning range compared to silica fiber.
- The developed device and fabrication method are promising for creating advanced, adaptable optical components.
- The photoelastic coefficient of the ZPU polymer was determined from the strain-dependent wavelength shift.
