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...

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Bibliographic Details
Published in:Microwave and optical technology letters 2020-09, Vol.62 (9), p.2826-2829
Main Authors: Qiao, Hai‐Dong, Liu, Hao, Mou, Jin‐Chao, Lv, Xin
Format: Article
Language:English
Subjects:
Focal plane
focal plane imaging
GaAs Schottky barrier diode
Imaging
Lenses
Microstrip antennas
Schottky diodes
Sensors
Signal processing
terahertz array detector
Three dimensional printing
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Summary: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.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.32388