Tunable optical behavior of infrared filters with phase change material

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We propose an asymmetric to quasisymmetric behavioral tunability of a structured filter operating in the mid-infrared (IR) spectral region, where the atmospheric transparency is high. The structure is designed through electromagnetic wave analysis using finite-difference time-domain computations. The behavioral tunability provides dynamic control of the optical behavior of the IR filter without geometric and structural changes and opens up a field of research area in the tunable IR devices. It is shown that optical characteristic can be switched from an optical diode (unidirectional isolator or asymmetric light transmission) to the bidirectional isolator (quasisymmetric behavior) based on the phase transition of vanadium dioxide in the entire mid-IR spectrum. The proposed structure can be fabricated with the current nano and microfabrication techniques and can be utilized in smart front IR windows for protecting delicate sensors in the IR imaging systems and IR missile seekers under strong IR laser radiation. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
Issue Date
2018-10
Language
English
Article Type
Article
Citation

JOURNAL OF NANOPHOTONICS, v.12, no.4

ISSN
1934-2608
DOI
10.1117/1.JNP.12.046022
URI
http://hdl.handle.net/10203/282619
Appears in Collection
EE-Journal Papers(저널논문)
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