Tunable solid state infrared filters for multispectral imaging

David A. Swanson; Leo Laux

doi:10.1117/12.137985

16 September 1992 Tunable solid state infrared filters for multispectral imaging

David A. Swanson, Leo Laux

Proceedings Volume 1690, Design of Optical Instruments; (1992) https://doi.org/10.1117/12.137985
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

This paper will review fundamental aspects of an innovative approach to multi-spectral imaging by exploiting variable electronic conductance properties of semi-conductor and semi- metal materials to create a tunable, bandpass infrared filter. The filter would operate through use of a controlled wavelength dependent change in optical reflectance that is a characteristics of electrochromic and photochromic materials. The reflectance effect is predicted by modified Drude free electron models for metallic-like conducting systems. As a design example, a filter based on doped tungsten trioxide (WO₃), will be presented. Another filter design resulting in an all solid state device would use properly constructed and doped silicon or GaAs and operate at cryogenic temperatures. These filter designs use a Michelson interferometer configuration with different reflective structures in the two 'arms'. Wavelength control is provided through electric field induced changes to the electronic charge carrier concentrations found in a thin layer at the surface of the active mirror materials.

Citation Download Citation

David A. Swanson and Leo Laux "Tunable solid state infrared filters for multispectral imaging", Proc. SPIE 1690, Design of Optical Instruments, (16 September 1992); https://doi.org/10.1117/12.137985

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KEYWORDS

Reflectivity

Reflection

Infrared radiation

Mirrors

Dielectrics

Optical filters

Doping

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