A Hybrid THz Imaging System with a 100-Pixel CMOS Imager and a 3.25-3.50 THz Quantum Cascade Laser Frequency Comb

T. J. Smith, Anna Broome, Daniel Stanley, Jonas Westberg, Gerard Wysocki, Kaushik Sengupta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The terahertz frequency range beyond 3 THz has exciting potential to have a transformative impact in a wide range of applications,including chemical and biomedical sensing,spectroscopy,imaging,and short-distance wireless communication. While there have been significant advancements in silicon-based THz imagers in the frequency ranges below 1 THz,technological development beyond 3 THz has been impeded by the lack of solid-state sources in this frequency range. In addition,the design space beyond 3 THz opens up fundamentally new challenges across electronics and the electromagnetic interface. In this spectral range,the wavelength is small enough (λox ≈ 50 μm at 3 THz) that a vertical via from the top antenna layer to the detector is a distributed element (transmission line or radiator). In this letter,we follow a careful circuits-electromagnetics co-design approach toward a hybrid imaging system with a 100-pixel CMOS imager that interfaces with a THz quantum cascade laser frequency comb that spans 3.25-3.5 THz with mode spacing of 17 GHz. The array chip,while designed for an optimal operation across 2.7-2.9 THz,demonstrates an average noise equivalent power (NEP) (across pixels) of $1260\,{\text{pW}}/\sqrt {{\text{Hz}}} $ between 3.25-3.5 THz and a projected NEP of $284\,{\text{pW}}/\sqrt {{\text{Hz}}} $ across the design range of 2.7-2.9 THz. To the best of our knowledge,we demonstrate for the first time full THz imaging in a hybrid quantum cascade laser (QCL)-CMOS fashion. This approach allows future works to leverage both QCL and CMOS technologies to demonstrate new technological advances for systems in the 1-10 THz range.

Original languageEnglish (US)
Title of host publicationESSCIRC 2019 - IEEE 45th European Solid State Circuits Conference
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages151-154
Number of pages4
ISBN (Electronic)9781728115504
DOIs
StatePublished - Sep 2019
Event45th IEEE European Solid State Circuits Conference, ESSCIRC 2019 - Cracow, Poland
Duration: Sep 23 2019Sep 26 2019

Publication series

NameESSCIRC 2019 - IEEE 45th European Solid State Circuits Conference

Conference

Conference45th IEEE European Solid State Circuits Conference, ESSCIRC 2019
CountryPoland
CityCracow
Period9/23/199/26/19

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electronic, Optical and Magnetic Materials
  • Hardware and Architecture
  • Electrical and Electronic Engineering

Keywords

  • CMOS
  • detector
  • hybrid imaging
  • imaging
  • quantum cascade laser
  • silicon
  • terahertz
  • THz imaging

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    Smith, T. J., Broome, A., Stanley, D., Westberg, J., Wysocki, G., & Sengupta, K. (2019). A Hybrid THz Imaging System with a 100-Pixel CMOS Imager and a 3.25-3.50 THz Quantum Cascade Laser Frequency Comb. In ESSCIRC 2019 - IEEE 45th European Solid State Circuits Conference (pp. 151-154). [8902823] (ESSCIRC 2019 - IEEE 45th European Solid State Circuits Conference). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ESSCIRC.2019.8902823