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Band-reject infrared metallic photonic band gap filters on flexible polyimide substrate

Published online by Cambridge University Press:  10 February 2011

Sandhya Gupta ,
Gary Tuttle ,
Mihail Sigalas  and
Kai-Ming Ho
Sandhya Gupta
Affiliation:
Department of Electrical and Computer Engineering and the Microelectronics Research Center Iowa State University, Ames IA 50011, sgupta@iastate.edu.
Gary Tuttle
Affiliation:
Department of Electrical and Computer Engineering and the Microelectronics Research Center Iowa State University, Ames IA 50011, sgupta@iastate.edu.
Mihail Sigalas
Affiliation:
Department of Physics and Astronomy and the Ames Laboratory, U. S. Department of Energy Iowa State University, Ames IA 50011
Kai-Ming Ho
Affiliation:
Department of Physics and Astronomy and the Ames Laboratory, U. S. Department of Energy Iowa State University, Ames IA 50011
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Abstract

Metallic photonic band gap (MPBG) structures are multi-layer metallic meshes imbedded in a dielectric medium. We report the successful design, fabrication, and characterization of infrared band-reject filters using MPBG structures in a flexible polyimide substrate. The metal layers of the MPBG have square grid patterns with short perpendicular cross-arm defects added halfway between each intersection. The transmission characteristics of these filters show a higher order band-reject region in addition to a lower order band gap that extends from zero to particular cut off frequency. The critical frequencies of the filters depend on the spatial periodicity of the metal grids and length of the cross-arm defects. Optical transmission measurements of the bandreject filters show lower edge cutoff frequency of about 2 THz and the higher order bandgap region centered around 4.5THz with attenuation of more than 35 dB in the bandgap region. This is in good agreement with the theoretical calculations. The filters maintain their optical characteristics after repeated bending, demonstrating mechanical robustness of the MPBG structure and have minimal dependence on angle of incidence.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 484: Symposium F – Infrared Applications of Semiconductors II , 1997 , 183
Copyright
Copyright © Materials Research Society 1998

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