Next Article in Journal
Efficient Donor Impurities in ZnO Nanorods by Polyethylene Glycol for Enhanced Optical and Glutamate Sensing Properties
Next Article in Special Issue
A Quantum Cascade Laser-Based Optical Sensor for Continuous Monitoring of Environmental Methane in Dunkirk (France)
Previous Article in Journal
FingerScanner: Embedding a Fingerprint Scanner in a Raspberry Pi
Previous Article in Special Issue
Impact of Humidity on Quartz-Enhanced Photoacoustic Spectroscopy Based CO Detection Using a Near-IR Telecommunication Diode Laser
Article Menu

Export Article

Open AccessArticle
Sensors 2016, 16(2), 221; doi:10.3390/s16020221

Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz Imaging

1
Reliability Science and Technology Laboratory, Empa, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
2
Institute of Applied Physics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
3
SwissFEL Laser Group, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
*
Author to whom correspondence should be addressed.
Received: 23 December 2015 / Accepted: 2 February 2016 / Published: 6 February 2016
(This article belongs to the Special Issue Infrared and THz Sensing and Imaging)
View Full-Text   |   Download PDF [4731 KB, uploaded 19 February 2016]   |  

Abstract

In terahertz (THz) materials science, imaging by scanning prevails when low power THz sources are used. However, the application of array detectors operating with high power THz sources is increasingly reported. We compare the imaging properties of four different array detectors that are able to record THz radiation directly. Two micro-bolometer arrays are designed for infrared imaging in the 8–14 μm wavelength range, but are based on different absorber materials (i) vanadium oxide; (ii) amorphous silicon; (iii) a micro-bolometer array optimized for recording THz radiation based on silicon nitride; and (iv) a pyroelectric array detector for THz beam profile measurements. THz wavelengths of 96.5 μm, 118.8 μm, and 393.6 μm from a powerful far infrared laser were used to assess the technical performance in terms of signal to noise ratio, detector response and detectivity. The usefulness of the detectors for beam profiling and digital holography is assessed. Finally, the potential and limitation for real-time digital holography are discussed. View Full-Text
Keywords: terahertz; digital holography; array detector; micro-bolometer; pyroelectric detector; real time imaging terahertz; digital holography; array detector; micro-bolometer; pyroelectric detector; real time imaging
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Hack, E.; Valzania, L.; Gäumann, G.; Shalaby, M.; Hauri, C.P.; Zolliker, P. Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz Imaging. Sensors 2016, 16, 221.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top