Terahertz sensing and imaging based on nanostructured semiconductors and carbon materials

• Published in: Laser & photonics reviews Vol. 6; no. 2; pp. 246 - 257
• Main Author: Kawano, Y.
• Format: Journal Article
• Language: English
• Published: Berlin WILEY-VCH Verlag 01.04.2012; WILEY‐VCH Verlag; Wiley-VCH
• Subjects: Bolometer; infrared, submillimeter wave, microwave and radiowave receivers and detectors; carbon nanotube; Exact sciences and technology; gallium arsenide; Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Landau level; near-field imaging; photon detector; Physics; semiconductor heterostructure; Terahertz; two-dimensional electron gas; Superconductors; THz range; Semiconductor materials; Radiation detectors; Visible radiation; Nanostructures; Carbon; Submillimeter wave imaging; Photonics
• ISSN: 1863-8880; 1863-8899
• DOI: 10.1002/lpor.201100006

The advantageous properties of terahertz (THz) waves, such as permeability through objects that are opaque for visible light and the energy spectrum in the microelectron‐volt range that are important in materials research, allow their potential use in various applications of sensing and imaging. However, since the THz region is located between the electronic and photonic bands, even the basic components such as detectors and sources have not been fully developed, unlike in other frequency regions. THz technology also has the problem of low imaging resolution, which results from a considerably longer wavelength than that of the visible light. However, the utilization of nanostructured electronic devices has recently opened up new horizons for THz sensing and imaging. This paper provides an overview of the THz detector and imaging techniques and tracks their recent progress. Specifically, two cutting‐edge techniques, namely, frequency‐selective THz‐photon detection and integrated near‐field THz imaging, are discussed in detail. Finally, the studies of superconductors and semiconductors with high‐resolution THz imaging are described. The advantageous properties of terahertz (THz) waves, such as permeability through objects that are opaque for visible light and the energy spectrum in the microelectron‐volt range that are important in materials research, allow their potential use in various applications of sensing and imaging. However, since the THz region is located between the electronic and photonic bands, even basic components such as detectors and sources have not been fully developed, unlike in other frequency regions. The utilization of nanostructured electronic devices has recently opened up new horizons for THz sensing and imaging.