Polarization-lndependent far-infrared optical bandpass filter based on microdisk metasurface design

Kruawan Wongpanya, Yuttana intaravanne and Sarun Sumriddetchkajorn*
National Electronics and Computer Technology Center (NECTEC),

National Science and Technology Development Agency (NSTDA),

111 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani, 12120 Thailand

In memory of Professor Gallieno Denardo, ICTP Italy

We present a polarization-independent far-infrared (FIR, 7–16 µm) bandpass filter based on a microdisk metasurface architecture. The design exhibits distinct resonance bands centered at 8.0, 10.0, 12.1, and 14.0 µm, compatible with photolithographic fabrication on a silicon wafer. Finite element method (FEM) simulations demonstrate strong field localization with |E|² enhancement up to ~25× near the disk rim and narrow transmission peaks with quality factors of Q ≈ 2.7–4.7, governed by cavity-phase tuning and near-critical coupling. The workflow—from conceptual metasurface design to numerical optimization—ensures full compatibility with standard photolithography and dry-etching processes available at our local microelectronics facility. The proposed metasurface offers a compact and scalable platform for multispectral FIR filtering and sensing in the far-infrared regime. © Anita Publications. All rights reserved.
Doi: 10.54955/AJP.35.1-3.2026.15-22
Keywords: Optical filters; Far-infrared; Metasurface; Microdisk; Critical coupling; Multispectral sensing; Thermal imaging

Peer Review Information
Method: Single- anonymous; Screened for Plagiarism? Yes
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