THz Metal-Mesh Bandpass Filters with Diamond-shaped Apertures for Sensitive THz Receivers
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916571893465088 |
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| author | Yoo, Changyun Hesler, Jeffrey L. Karasik, Boris S. |
| author_facet | Yoo, Changyun Hesler, Jeffrey L. Karasik, Boris S. |
| contents | 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 free-standing 5-micron 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 (FEM) simulation results, we provide simple design equations that can be used for rapid design with high accuracy. The measured transmission profiles of 1.9-THz, 2.5-THz, 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_10843 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | THz Metal-Mesh Bandpass Filters with Diamond-shaped Apertures for Sensitive THz Receivers Yoo, Changyun Hesler, Jeffrey L. Karasik, Boris S. Instrumentation and Detectors Applied Physics 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 free-standing 5-micron 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 (FEM) simulation results, we provide simple design equations that can be used for rapid design with high accuracy. The measured transmission profiles of 1.9-THz, 2.5-THz, 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. |
| title | THz Metal-Mesh Bandpass Filters with Diamond-shaped Apertures for Sensitive THz Receivers |
| topic | Instrumentation and Detectors Applied Physics |
| url | https://arxiv.org/abs/2501.10843 |