Use of high Tc superconducting YBCO microbridge for detection of wavelength 3 mm

Superconducting microbridge has high sensitivity and low noise. We have successfully developed High Tc superconducting detector of microbridge structure with area of 10×20 μm. At 500 K, its responsitivity is R=8.9×10⁴ v w^-1, the detectivity D* is 4.5×10¹⁰ cm H_z^1/2 w^-1. Using such a detector, we have detected submillimeter wave and millimeter wave. For wavelength of 3 mm, the achieved responsitivity R is 6.01×10² v w^-1 and detectivity D* is 6.1×10⁸ cm H_z^1/2 w^-1. Our work has opened a new way to use this kind of detector