YBa2Cu3O6+x compounds are well known to exhibit superconducting properties for x > 0.5 and semiconducting
properties for lower oxygen content. Superconducting YBCO was obtained commercially; the semiconducting material
was deposited by sputtering at room temperature. In order to migrate from superconducting to uncooled semiconducting
far-infrared bolometer technologies, we have first realized and compared the performance of 2 × 2 pixel arrays made
from both materials deposited on MgO substrates. Pixels were in the shape of meanders, embedded in an area of about 1
mm2. Pixel detectivity and thermal crosstalk were studied in the 1 Hz to 100 kHz modulation frequency range by using a
850 nm solid state laser. Secondly we have improved the geometry of semiconducting YBCO bolometers fabricated on
silicon substrates, in order to match their impedance with the impedance of the antenna required for working in the THz
range. First optical results are also presented, where both regular bolometric and pyroelectric responses are exhibited.
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