220 GHz focal plane imaging demonstration using integrated terahertz array detector.

This letter experimentally demonstrates 220 GHz transmission‐based terahertz imaging based on an integrated terahertz 1 × 16 array detector. The array detector consists of a 3D‐printed lens array, 16 detector chips and a chip board. Each detector chip contains a planar bowtie antenna printed on a 50 μm‐thick quartz laminate, where a GaAs Schottky barrier diode is loaded in the center of the antenna. The detector shows excellent performance with an average responsivity of 1650 V/W and an average noise equivalent power of 3.6 pW/√Hz at 220 GHz. Based on the proposed array detector, a transmission‐based terahertz imaging system is built, including a 220 GHz illumination source, a servo system, a signal processing unit and a 280 mm‐diameter doubly‐hyperbolic Polytetrafluorethylen lens. A lateral resolution of 8 mm at a standing‐off distance of 1.5 m is achieved, approaching to the theoretical result. [ABSTRACT FROM AUTHOR]