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Controlling the spectral response in guided-mode resonance filter design
Samuel T Thurman1, G Michael Morris
1The Institute of Optics, University of Rochester, Rochester, New York 14627, USA. thurman@optics.rochester.edu
Applied Optics
|June 7, 2003
Summary
Guided-mode resonance (GMR) filters offer precise control over spectral width, line-shape symmetry, and sideband levels. This thin-film filter design enables narrower spectral widths and looser tolerances for telecommunications applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Conventional thin-film filters face limitations in spectral control.
- Guided-mode resonance (GMR) offers a promising alternative for advanced optical filter design.
Purpose of the Study:
- To present a novel design for guided-mode resonance (GMR) filters with simultaneous control over spectral width, line-shape symmetry, and sideband levels.
- To explore factors limiting minimum spectral width in GMR filters.
- To introduce a design for a 200-GHz telecommunications filter with tolerance analysis.
Main Methods:
- Utilizing thin-film techniques in conjunction with spectral width control methods.
- Employing interference effects for passband shaping by stacking multiple GMR filters.
- Performing tolerance analysis on the proposed GMR filter design.
Main Results:
- Achieved simultaneous control over line-shape symmetry, sideband levels, and spectral width.
- Identified factors that limit the minimum achievable spectral width.
- Presented a 200-GHz telecommunications filter design with fewer layers and looser thickness tolerances compared to conventional thin-film filters.
- Discussed grating fabrication tolerances.
Conclusions:
- GMR filters provide superior spectral control compared to conventional thin-film filters.
- The presented GMR filter design offers practical advantages in terms of layer count and fabrication tolerances for telecommunications.
- Further investigation into factors limiting spectral width is warranted.