THz Metal-Mesh Bandpass Filters With Diamond-Shaped Apertures for Sensitive THz Receivers

IF 3.9 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-01-27 DOI:10.1109/TTHZ.2025.3534757

Changyun Yoo;Jeffrey L. Hesler;Boris S. Karasik

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引用次数: 0

Abstract

In this letter, we present high-performance terahertz (THz) metal-mesh bandpass filters developed to mitigate direct detection effects in sensitive THz receivers based on superconducting hot-electron bolometer (HEB) mixers. These metal-mesh filters are freestanding 5-μm-thick sheets of copper perforated with a periodic array of diamond-shaped apertures. The simple aperture design minimizes the effect of fabrication (rounding) errors on filter performance, allowing precise engineering of the center frequency (1.5–5.5 THz) while maintaining high (>90%) peak power transmission at normal incidence and a relatively narrow bandwidth of 5%–15%. Based on finite-element method simulation results, we provide simple design equations that can be used for rapid design with high accuracy. The measured transmission profiles of 1.9-, 2.5-, and 4.7-THz filters show excellent agreement with the simulation results. These filters are compatible with cryogenic operation and can substantially reduce the direct detection effects in HEB mixers.

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来源期刊

IEEE Transactions on Terahertz Science and Technology ENGINEERING, ELECTRICAL & ELECTRONIC-OPTICS

CiteScore

7.10

自引率

9.40%

发文量

102

期刊介绍： IEEE Transactions on Terahertz Science and Technology focuses on original research on Terahertz theory, techniques, and applications as they relate to components, devices, circuits, and systems involving the generation, transmission, and detection of Terahertz waves.