Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 8, Issue 6, Pages 746-756Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2018.2873973
Keywords
Focal plane array (FPA); frequency-selective absorber (FSA); incoherent source; submillimeter wavelengths
Funding
- Academy of Finland [314447]
- ERC [639749]
- Academy of Finland (AKA) [314447, 314447] Funding Source: Academy of Finland (AKA)
- European Research Council (ERC) [639749] Funding Source: European Research Council (ERC)
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Passive imaging cameras at submillimeter wavelengths with large format focal plane arrays (FPAs) are being developed as the next generation of security screening systems. In this contribution, a dual-band FPA for security imagers at submillimeter wave frequencies is presented. The detectors are based on bolometric superconducting kinetic inductance resonators, which allow the development of large FPAs at medium-cooled temperatures. Two frequency-selective absorber (FSA) sets coupled to superconductive resonator lines are designed to implement a dualcolor security imager. The performance of the dual-band imager is evaluated using spectral analysis approach that combines Fourier optics with a Floquet-mode f eld representation. The geometry of the unit cells is based on a Jerusalem cross configuratio and the designed FSAs show a stable angular response and a rejection 1 to 3 of the undesired bandwidth. The detectors in the dual-band FPA are distributed over a hexagonal grid to maximize their physical size and then improve their sensitivity. The effective point spread function of the imager coupled to a black-body point source over a wide frequency band (1: 6) was demonstrated experimentally with excellent agreement to the one estimated by using the proposed spectral technique.
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