Characterization of the composite bolometer with a high-Tc superconductor thermometer for an absolute radiometer of synchrotron radiation

Calculations of Some Doping Nanostructurations and Patterns Improving the Functionality of High-Temperature Superconductors for Bolometer Device Applications

“…Bolometers are radiation sensors that detect incident energy via the increase of the temperature T caused by the absorption of incoming photons [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Bolometers are often used, e.g., for thermal infrared cameras (see, e.g., [1][2][3][4][5][6][7][8][9][10]), mm-wave sensing [1][2][3][4][5][6][8][9][10][11][12][13], space-based [12,13], laboratory far-infrared spectroscopy [13], etc.…”

“…Bolometers are often used, e.g., for thermal infrared cameras (see, e.g., [1][2][3][4][5][6][7][8][9][10]), mm-wave sensing [1][2][3][4][5][6][8][9][10][11][12][13], space-based [12,13], laboratory far-infrared spectroscopy [13], etc. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Superconductors are among the best candidate materials for bolometers, due to their extreme sensitivity to T near the superconducting transition, measurable for instance through the sharp variations of the electrical resistance R (resistive transition-edge bolometer-TES).…”

“…For resistive TES bolometers, a key figure for performance is the so-called "temperature coefficient of resistance" (TCR), given by [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]:…”

“…After the discovery of high-T c cuprate superconductors (HTS), various authors have explored their use for resistive bolometers with simpler liquid-nitrogen-based cryogenics (the so-called resistive HTS TES bolometers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]). The compound YBa 2 Cu 3 O δ (YBCO) is the HTS material usually considered for this application, usually with maximum-T c doping, i.e., stoichiometry δ 6.93.…”

“…Such YBCO thin films provide TCR ∼ 1.5 K −1 , low noise at an operational temperature T c ∼ 90 K, and also favorable values for the rest of parameters contributing to good bolometric performance (thermal conductivity, infrared absorbance, response time, etc.) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”