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We present a detailed investigation of the responsivity and the noise in room temperature THz direct detectors made of YBa2Cu3O7-x (YBCO) thin-film nano-bolometers. The YBCO nano-bolometers are integrated with planar spiral antennas covering a frequency range from 100 GHz to 2 THz. The detectors were characterized at 1.6 THz, 0.7 THz, 400 GHz and 100 GHz. The maximum electrical responsivity of 70 V/W and a minimum noise equivalent power (NEP) of 50 pW/Hz0.5 were measured, whereas the highest optical responsivity was 45 V/W. The (1/f) noise in nano-bolometers is independent on the device volume and can be found as (VN/V)2=6&#x00D7;10-11&#x00D7;1/f Hz-1 for a given modulation frequency f and a dc voltage V.

ieee transactions on terahertz science and technology

Low Noise Nanometer Scale Room-Temperature <formula formulatype="inline"><tex Notation="TeX">${\hbox{YBa}}_{2}{\hbox{Cu}}_{3}{\hbox{O}}_{7-x}$</tex> </formula> Bolometers for THz Direct Detection

Low Noise Nanometer Scale Room-Temperature ${\hbox{YBa}}_{2}{\hbox{Cu}}_{3}{\hbox{O}}_{7-x}$ Bolometers for THz Direct Detection