YBCO mid-infrared bolometer arrays

A 2*2 array of YBa/sub 2/Cu/sub 3/O/sub 7-(delta)/ (YBaCuO) transition edge bolometers has been fabricated on an MgO substrate. The bolometers are of the meander type with line width and line spacing of 40 (mu)m. The meander length of a single bolometer is 12.5 mm, covering an area of 1 mm*1 mm. The voltage responsivity of each pixel, at 10 (mu)m wavelength, has been studied as a function of modulation frequency. The array exhibits a uniform response and an electrical noise equivalent power (NEP) of 4.2 *10/sup -12/ W/(radical)Hz or an optical NEP of 1 *10/sup -9/ W/(radical)Hz. Thermal crosstalk between adjacent pixels has been also studied and first imaging results are presented.