A High Efficiency Superconducting On-chip Filterbank with Directional Filters for Integral Field Units in the Sub-millimeter Regime
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arXiv
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| Format: | Preprint |
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2026
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| author | Marting, Louis H. Karatsu, Kenichi Scholtenhuis, Leon G. G. Olde Dabironezare, Shahab O. Laguna, Alejandro Pascual Moerman, Arend Thoen, David J. J., A. der Linden, van Endo, Akira Baselmans, Jochem J. A. |
| author_facet | Marting, Louis H. Karatsu, Kenichi Scholtenhuis, Leon G. G. Olde Dabironezare, Shahab O. Laguna, Alejandro Pascual Moerman, Arend Thoen, David J. J., A. der Linden, van Endo, Akira Baselmans, Jochem J. A. |
| contents | Integrated superconducting spectrometers are developing to the point that they are enabling integral field units, providing large area spectral mapping capabilities for astronomy in the sub-millimeter band. However, these integral field units are only worthwhile if they have a high efficiency, but to date the efficiency of on-chip filterbanks has been quite poor. Here we demonstrate a filterbank with high efficiency by using directional filters. Using a cryogenic thermal load and a noise measurement in combination with a continuous-wave terahertz source to obtain the spectral response of the filters, we are able to accurately measure the filterbank efficiency, accounting for all quasi-optical elements within our setup. We experimentally obtain an average peak coupling efficiency to the detectors of 75% in a filterbank that sparsely samples between 125 GHz to 220 GHz using filters with a mean loaded quality factor of 19.6. Our results demonstrate that a filterbank with a high efficiency is achievable using directional filters, giving a clear route towards efficient integral field units. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_06334 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A High Efficiency Superconducting On-chip Filterbank with Directional Filters for Integral Field Units in the Sub-millimeter Regime Marting, Louis H. Karatsu, Kenichi Scholtenhuis, Leon G. G. Olde Dabironezare, Shahab O. Laguna, Alejandro Pascual Moerman, Arend Thoen, David J. J., A. der Linden, van Endo, Akira Baselmans, Jochem J. A. Instrumentation and Detectors Instrumentation and Methods for Astrophysics Integrated superconducting spectrometers are developing to the point that they are enabling integral field units, providing large area spectral mapping capabilities for astronomy in the sub-millimeter band. However, these integral field units are only worthwhile if they have a high efficiency, but to date the efficiency of on-chip filterbanks has been quite poor. Here we demonstrate a filterbank with high efficiency by using directional filters. Using a cryogenic thermal load and a noise measurement in combination with a continuous-wave terahertz source to obtain the spectral response of the filters, we are able to accurately measure the filterbank efficiency, accounting for all quasi-optical elements within our setup. We experimentally obtain an average peak coupling efficiency to the detectors of 75% in a filterbank that sparsely samples between 125 GHz to 220 GHz using filters with a mean loaded quality factor of 19.6. Our results demonstrate that a filterbank with a high efficiency is achievable using directional filters, giving a clear route towards efficient integral field units. |
| title | A High Efficiency Superconducting On-chip Filterbank with Directional Filters for Integral Field Units in the Sub-millimeter Regime |
| topic | Instrumentation and Detectors Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2603.06334 |