2-11
Andrey Pankratov, L.S. Kuzmin, A.V. Gordeeval, A.V. Chiginev, E.A.Matrozova, D.A. Pimanov, L.S. Revin, A.V. Blagodatkin, V.O. Zbrozhek
Nizhny Novgorod State Technical University, Institute for Physics of Microstructures of RAS, Chalmers University of Technology
Multichroic receivers with Cold-Electron Bolometers of 0.03-7 THz range for airborne and balloon instruments
The Cold-Electron Bolometer (CEB), representing double SIN junction with a normal metal (hybrid superconductor/ ferromagnetic (S/F)) absorber, is the promising candidate for receiving systems for future airborne and balloon missions such as LSPE. LSPE mission is devoted to measuring B-modes in the cosmic microwave background in a night Arctic stratospheric flight. The advantages of the CEB are the possibility to receive signal in a broad frequency range from 0.03 to 7 THz due to normal metal absorber and the effective electron cooling [1] due to the hybrid S/F absorber and normal metal traps. This allows building effective photon-noise limited receiving systems with ultimate sensitivity [2], operating at 0.3K in 3He fridges. Due to its small size, the CEB can be effectively used to create multichroic elements for actual tasks in submillimeter astronomy due to the benefit from its ability to use co-located data [3]
In the present talk we describe the developed 350 GHz receiving pixel for Olimpo balloon mission, based on 2D arrays of dipole antennas with cold-electron bolometers [4]. The photon-noise limited sensitivity is achieved due to tiny hybrid S/F nanoabsorber, as well as due to efficient electron cooling even under high power load [2]. Further improvement of the bolometer design allowed reaching theoretical limit of electron cooling from 300 to 65 mK [1]. We also describe first attempts to develop multichroic receiving systems [3] for 75-105 GHz channel of COrE mission, both with kinetic inductance nanofilters [5] and with internal bandpass filters by resonant slots and cold-electron bolometers [6].
The current development of LSPE multichroic receiving system with CEBs will be outlined. According to the requirements, a receiving system of the LSPE SWIPE telescope has a main frequency channel at 145 GHz for CMB measurements and two ancillary channels of 210 and 240 GHz for cosmic dust measurements. For the moment, the basic concept of 210/240 channels is based on separate horns with TES for each frequency. Replacement of this system by a multichroic system with CEBs receiving both frequencies on-chip would improve the accuracy of co-located difference measurements of the cosmic dust. For voltage-biased operation with a SQUID readout, the parallel arrays of about 200 dipole antennas with CEBs on a 280 um Si substrate were selected. The simulation results and current designs will be described.
This work was supported by the Russian Science Foundation (Project No. 21-79-20227).
References
1. A.V. Gordeeva, et al, Record electron self-cooling in cold-electron bolometers with a hybrid superconductor/ferromagnetic nanoabsorber and traps, Scientific Reports 10, 21961 (2020). https://www.nature.com/articles/s41598-020-78869-z
2. L.S. Kuzmin, et al, Photon-noise-limited cold-electron bolometer based on strong electron self-cooling for high-performance cosmology missions, Communications Physics 2, 104 (2019). https://www.nature.com/articles/s42005-019-0206-9
3. L. S. Kuzmin, A Resonant Cold-Electron Bolometer With a Kinetic Inductance Nanofilter, IEEE Transactions on Terahertz Science and Technology, 4, 314 (2014). http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6778093
4. L.S. Kuzmin, 2D Array of Cold-Electron Nanobolometers with Double Polarization Cross-Dipole Antennae, Nanoscale Research Lett., 7, 224 (2012). https://nanoscalereslett.springeropen.com/articles/10.1186/1556-276X-7-224
5. A.S. Mukhin, L.S. Kuzmin, et al, Multifrequency seashell antenna based on resonant cold-electron bolometers with kinetic Inductance Nanofilters for CMB measurements, AIP Advances, 9, 015321 (2019). https://doi.org/10.1063/1.5080323
6. L.S. Kuzmin, et al, Multichroic seashell antenna with internal filters by resonant slots and cold-electron bolometers, Superconductor Science and Technology, 32, 035009 (2019). https://doi.org/10.1088/1361-6668/aafeba
