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Title: Tunable optical behavior of infrared filters with phase change material
Authors: Özer, Ahmet
Koçer, H.
Kurt, Hamza
Keywords: Asymmetric transmission
Finite-difference time-domain methods
Infrared spectrum
Optical filters
Phase-change thermochromic material
Vanadium dioxide
Electromagnetic waves
Finite difference time domain method
Infrared detectors
Infrared devices
Infrared imaging
Light transmission
Optical filters
Phase change materials
Vanadium dioxide
Issue Date: 1-Oct-2018
Publisher: Society of Photo-Optical Instrumentation Engineers (SPIE)
Source: Ozer, A., Kocer, H., & Kurt, H. (2018). Tunable optical behavior of infrared filters with phase change material. Journal of Nanophotonics, 12(4), 046022.
Abstract: 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.
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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