Abstract
The response of the Cold-Electron Bolometers (CEBs), integrated into a 2-D array of dipole antennas, has been measured by irradiation from YBa2Cu3O7−δ (YBCO) 50 μm long Josephson junction into the THz region at frequencies from 0.1 to 0.8 THz. The possibility of controlling the amplitude-frequency characteristic is demonstrated by the external magnetic field in the traveling wave regime of a long Josephson junction. The YBCO junction has been formed on the bicrystal Zr1−xYxO2 (YSZ) substrate by magnetron sputtering and etching of the film. CEBs have been fabricated using an Al multilayer structure by a self-aligned shadow evaporation technique on Si substrate. Both receiver and oscillator have been located inside the same cryostat at 0.3 K and 2.7 K plates, respectively.
Highlights
The high precision measurements of the polarization in the cosmic microwave background (CMB)radiation is one of the major tasks in modern cosmology, needed to detect primordial B-modes
Bolometer response is defined as a voltage difference at a fixed bias current through the Cold-Electron Bolometers (CEBs) array with and without the Josephson junction (JJ) radiation
Changing the current through the Josephson junction, the signal from the bolometer and the voltage on the YBCO oscillator have been measured, see Figure 3
Summary
The high precision measurements of the polarization in the cosmic microwave background (CMB). Radiation is one of the major tasks in modern cosmology, needed to detect primordial B-modes. B-mode is a curl component of the polarization of CMB, which, as believed, left by the primordial gravitational waves during the inflation stage of the universe’s evolution. If detected, it is assumed to be a sufficient evidence of the inflationary epoch in the early universe [1]. The cold-electron bolometer (CEB) is an attractive candidate for these measurements because the decoupling of the phonon and electron subsystems in the tiny absorber gives it such advantages as high sensitivity and high saturation power [3,4] as well as the immunity to cosmic rays [5].
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