Schottky diodes with the cutoff frequency of 2.6 THz and its applications in focal imaging array

This paper presents some critical techniques of the terahertz focal imaging system. As the key nonlinear devices in the focal plane array, the Schottky diodes with the cutoff frequency of 2.6 THz are designed and fabricated. Based on the Schottky diodes, the quasi-optical mixers are designed and realized using the GaAs Schottky diode process, which consists of the planar antennas on chip, the Schottky diodes and high resistivity lens. According to the Nyquist sampling theorem, a 220 GHz 1×6 focal plane array is designed and analyzed.