Reconfigurable Far-Infrared FSS Filters on Polyimide Substrate

• Published in: Journal of infrared, millimeter and terahertz waves Vol. 44; no. 11-12; pp. 885 - 897
• Main Authors: Newton, Lucas, Nahar, Niru K.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-12-2023; Springer Nature B.V
• Subjects: Classical Electrodynamics; Conformity; Design; Electrical Engineering; Electronics and Microelectronics; Engineering; Frequency selective surfaces; Infrared filters; Instrumentation; Low temperature; Microelectromechanical systems; Optics; Phase change materials; Reconfiguration; Silicon wafers; Substrates; Tensile strength; Vanadium dioxide; Vanadium oxides; Frequency selective surfaces; VO; Polymers; Far-infrared; Reconfigurable
• ISSN: 1866-6892; 1866-6906
• DOI: 10.1007/s10762-023-00953-y

We present a novel electrically scalable, reconfigurable frequency selective surface (FSS) far-IR filter fabricated on transparent, and flexible polyimide substrate. Our proposed method of reconfigurabilty is achieved by employing phase change materials (PCMs). The PCM primarily considered in this proposal is vanadium dioxide (VO
2
) due to its relatively low temperature reversible metal to insulator transition and conformity to common fabrication techniques. Here, the proposed reconfigurable filter covers 15–17 μm with a stopband center wavelength that can switch between 15.5 and 16.1 μm with the activation of VO
2
. Although the design provided is intended for the far-infrared, it can easily be scaled to meet the needs of longer wavelength and lower frequency applications.