An optical heterodyne mixing technique was developed to study the photoresponse in patterned YBa2Cu3O7−δ (YBCO) thin film. Our mixing system is composed of two identical 1.54 μm wavelength laser diodes and the laser light is introduced without optical fibers onto the YBCO thin film. We succeeded in detecting the optical signals in a YBCO thin film up to 10 GHz, which could not be achieved by the conventional direct amplitude modulated method. The YBCO photodetector has a sensitivity of D*=5.0×108 cm W−1 Hz−1/2 at 77 K. This experiment enables the observation of the fast photoresponse in the resistive state. The response can be attributed to the electron heating model.
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