Millimeter-Wavelength Lens-Absorber-Coupled Ti/Al Kinetic Inductance Detectors
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866914335875399680 |
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| author | Laguna, Alejandro Pascual Rollano, Victor Najarro-Fiandra, Aimar Rodriguez, David Magaz, Maria T. Granados, Daniel Gomez, Alicia |
| author_facet | Laguna, Alejandro Pascual Rollano, Victor Najarro-Fiandra, Aimar Rodriguez, David Magaz, Maria T. Granados, Daniel Gomez, Alicia |
| contents | This work presents Ti/Al bi-layer Microwave Kinetic Inductance Detectors (MKIDs) based on lens-coupled spiral absorbers as the quasi-optical coupling mechanism for millimeter-wavelength radiation detection. From simulations, the lens-coupled absorbers provide a 70% lens aperture efficiency in both polarizations over an octave band with a spiral array absorber and over 10% relative bandwidth with a single spiral. We have fabricated and measured two devices with bare Ti/Al MKIDs: a 3x3 cm chip with 9 pixels to characterize the optical response at 85 GHz of the two variations of the absorber; and a large format demonstrator with 253 spiral-array pixels showing potential towards a large format millimeter-wavelength camera. We estimate a sensitivity of 1 $\mathrm{mK}\cdot\mathrm{Hz}^{-0.5}$ and a 95% detector yield. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_02971 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Millimeter-Wavelength Lens-Absorber-Coupled Ti/Al Kinetic Inductance Detectors Laguna, Alejandro Pascual Rollano, Victor Najarro-Fiandra, Aimar Rodriguez, David Magaz, Maria T. Granados, Daniel Gomez, Alicia Instrumentation and Methods for Astrophysics Instrumentation and Detectors Optics This work presents Ti/Al bi-layer Microwave Kinetic Inductance Detectors (MKIDs) based on lens-coupled spiral absorbers as the quasi-optical coupling mechanism for millimeter-wavelength radiation detection. From simulations, the lens-coupled absorbers provide a 70% lens aperture efficiency in both polarizations over an octave band with a spiral array absorber and over 10% relative bandwidth with a single spiral. We have fabricated and measured two devices with bare Ti/Al MKIDs: a 3x3 cm chip with 9 pixels to characterize the optical response at 85 GHz of the two variations of the absorber; and a large format demonstrator with 253 spiral-array pixels showing potential towards a large format millimeter-wavelength camera. We estimate a sensitivity of 1 $\mathrm{mK}\cdot\mathrm{Hz}^{-0.5}$ and a 95% detector yield. |
| title | Millimeter-Wavelength Lens-Absorber-Coupled Ti/Al Kinetic Inductance Detectors |
| topic | Instrumentation and Methods for Astrophysics Instrumentation and Detectors Optics |
| url | https://arxiv.org/abs/2510.02971 |