| Yates, Stephen J. C., Laguna, Alejandro Pascual, Jellema, Willem, Castillo-Dominguez, Edgar, Ferrari, Lorenza, Lap, Bram, Murugesan, Vignesh, Silva, Jose R. G., Thoen, David, Veenendaal, Ian and Baselmans, Jochem J. A. 2025. Demonstration of ultrasensitive KIDs for future THz space borne polarimeters. IEEE Transactions on Terahertz Science & Technology 15 (4) , 558 - 565. 10.1109/TTHZ.2025.3566218 |
Abstract
We present measurements and simulations of the polarization purity of leaky lens-antenna coupled microwave kinetic inductance detectors (KIDs) at 1.5 THz. From polarized phase and amplitude beam pattern measurements we find the integrated cross-polarization ratio to be at –21.5 dB for 1 f#λ spatial sampling. The measurements agree well with the theoretical description which is based on a combination of in-transmission simulation of the antenna feed, and an in-reception analysis of the antenna-KID system. A neutral density filter limited the power per detector to around 500 fW, enabling these measurements to be taken on detectors that in a low background have a measured noise equivalent power of 5–7×10−20 W/Hz−−−√. These combined measurements show that these detectors are excellent candidates for large scale and high-performance imaging polarimetric instruments.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Publisher: | Institute of Electrical and Electronics Engineers |
| ISSN: | 2156-342X |
| Last Modified: | 10 Dec 2025 14:30 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/183013 |
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