Abstract
We propose an entirely plane-structure camera for millimeter wave astronomy, in order to reduce production cost and time. The camera is composed of a silicon lens-let, antennas, feed lines, and detectors made from the same superconducting aluminum film on a silicon substrate. A couple of double-slot antennas are located the same focal plane of a small substrate lens to enhance the packing density of detectors and observation efficiency. To achieve high sensitivity, we adapted a microwave kinetic inductance detector as a photon sensor, which consists of a superconducting microresonator. We examined the optical performance of the camera attached to a silicon lens array at 220 GHz in a 0.3 K cryostat. The measured beams were in good agreement with the calculations within the dynamic range of the setup (20 dB). Polarization misalignments between the dual-double slot antenna were less than 2∘, and cross-polarization level was around −7 dB. The relatively high cross-polarization would be explained by an antenna crosstalk mediated by quasiparticle diffusion.
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This work was partially supported by JSPS KAKENHI Grant Number 24860015 and 70262152. This work was partially supported by the co-development funding from Research Coordination Committee, NAOJ
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Naruse, M., Nitta, T., Karatsu, K. et al. Dual-Double Slot Antennas Fabricated with Single Superconducting Film for Millimeter Wave Camera. J Infrared Milli Terahz Waves 37, 128–136 (2016). https://doi.org/10.1007/s10762-015-0216-y
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DOI: https://doi.org/10.1007/s10762-015-0216-y