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Integrated 2D photonic crystal stack filter fabricated using nanoreplica molding
Fuchyi Yang1, Gary Yen, Brian T Cunningham
1University of Illinois at Urbana-Champaign, Department of Electrical and Computer Engineering, Micro and Nanotechnology Laboratory, 208 N. Wright Street, Urbana, IL 61801, USA.
Optics Express
|July 1, 2010
Summary
Researchers developed novel 2D photonic crystal stacks for advanced optical filters. These filters offer enhanced optical density and angle tolerance for precise light manipulation.
Area of Science:
- Photonics and optical engineering
- Materials science
Background:
- Single photonic crystal slabs have limitations in optical density and angle tolerance.
- Guided mode resonance (GMR) offers potential for narrow-band optical filtering.
Purpose of the Study:
- To design, fabricate, and characterize integrated 2D photonic crystal stacks.
- To achieve polarization-independent reflectance filters with improved performance.
- To demonstrate a fabrication method suitable for mass production.
Main Methods:
- Utilized guided mode resonance (GMR) for narrow spectral bandwidth centered at 532 nm.
- Vertically stacked up to three 2D photonic crystal layers on a plastic substrate.
- Employed repeated nanoreplica molding without requiring inter-layer alignment.
Main Results:
- Achieved optical density of 2.24.
- Demonstrated an angular tolerance of 14.8 degrees.
- Filters are polarization-independent.
Conclusions:
- Integrated 2D photonic crystal stacks offer superior optical density and angle tolerance compared to single slabs.
- Nanoreplica molding provides a scalable fabrication route for these advanced optical filters.
- The developed filters are suitable for applications requiring precise spectral and angular selectivity.
