Optical and Electrical Characterization of a Large Kinetic Inductance Bolometer Focal Plane Array

Andrey Timofeev, Juho Luomahaara, Leif Grönberg, Aki Mäyrä, Hannu Sipola, Mika Aikio, Mikko Metso, Visa Vesterinen, Kirsi Tappura, Juha Ala-Laurinaho, Arttu Luukanen, Juha Hassel*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

Sub-THz imaging techniques are currently emerging with applications especially in security screening requiring higher throughput in mass transit and public areas. In the context of person imagers, the field of view and the spatial resolution set the requirement for the number of image pixels. We perform an experimental feasibility study on a fully staring radiometric camera with one detector per image pixel. The aim is to avoid the shortcomings characteristic of optomechanical scanners with a limited number of detectors. Our approach is based on superconducting kinetic inductance bolometer arrays. We demonstrate successful fabrication and operation of a focal plane array with 2500 nanomembrane-integrated bolometers, and a compatible optical system enabling standoff imaging at the distance of 5 m. We characterize the system in terms of radiometric contrast and spatial resolution.

Original languageEnglish
Pages (from-to)218-224
Number of pages7
JournalIEEE Transactions on Terahertz Science and Technology
Volume7
Issue number2
DOIs
Publication statusPublished - Mar 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • Bolometers
  • cryogenics
  • kinetic inductance
  • radiometry
  • security screening
  • submillimeter wave circuits
  • superconducting detectors
  • THz camera
  • THz imaging
  • THZ

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