Infrared filters using metallic photonic band gap structures on flexible substrates
- Department of Electrical and Computer Engineering and the Microelectronics Research Center, Iowa State University, Ames, Iowa 50011 (United States)
- Department of Physics and Astronomy and the Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011 (United States)
Metallic photonic band gap (MPBG) filter structures operating at far infrared wavelengths have been designed, fabricated, and characterized. The MPBGs are multilayer metallic meshes imbedded in a flexible polyimide dielectric. Depending on the periodic pattern of the metal grids, the filters have either simple high-pass or more complex transmission characteristics. The critical frequencies of the filters depend on the spatial periodicity of the metal grids and the interlayer separation. Optical transmission measurements on a high-pass structure show cutoff frequency of 3 THz and attenuation of more than 35 dB in the cutoff region, in good agreement with predicted results. Band-reject filters show similarly good attenuation and large fractional bandwidths. The filters maintain their optical characteristics after repeated bending, demonstrating mechanical robustness of the MPBG structure. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Ames National Laboratory
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 543754
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 17 Vol. 71; ISSN 0003-6951; ISSN APPLAB
- Country of Publication:
- United States
- Language:
- English
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