Chemical sensing and imaging with pulsed terahertz radiation

Walther, Markus; Fischer, Bernd M.; Ortner, Alex; Bitzer, Andreas; Thoman, Andreas; Helm, Hanspeter
June 2010
Analytical & Bioanalytical Chemistry;Jun2010, Vol. 397 Issue 3, p1009
Academic Journal
Over the past decade, terahertz spectroscopy has evolved into a versatile tool for chemically selective sensing and imaging applications. In particular, the potential to coherently generate and detect short, and hence, broadband terahertz pulses led to the development of efficient and compact spectrometers for this interesting part of the electromagnetic spectrum, where common packaging materials are transparent and many chemical compounds show characteristic absorptions. Although early proof-of-principle demonstrations have shown the great potential of terahertz spectroscopy for sensing and imaging, the technology still often lacks the required sensitivity and suffers from its intrinsically poor spatial resolution. In this review we discuss the current potential of terahertz pulse spectroscopy and highlight recent technological advances geared towards both enhancing spectral sensitivity and increasing spatial resolution. [Figure not available: see fulltext.]


Related Articles

  • Room temperature GaN/AlGaN self-mixing terahertz detector enhanced by resonant antennas. Sun, Y. F.; Sun, J. D.; Zhou, Y.; Tan, R. B.; Zeng, C. H.; Xue, W.; Qin, H.; Zhang, B. S.; Wu, D. M. // Applied Physics Letters;6/20/2011, Vol. 98 Issue 25, p252103 

    This letter focuses on the fabrication and characterization of a terahertz detector integrated with a group of low pass filters and resonant antennas. The detector operates as a self-mixer on GaN/AlGaN high electron mobility transistor (HEMT). At room temperature, a strong dc photocurrent is...

  • Supercontinuum radiation for applications in chemical sensing and microscopy. Kaminski, C.F.; Watt, R.S.; Elder, A.D.; Frank, J.H.; Hult, J. // Applied Physics B: Lasers & Optics;Sep2008, Vol. 92 Issue 3, p367 

    The advent of compact, high brightness supercontinuum radiation sources employing solid core photonic crystal fibres is beginning to make an impact across the field of applied spectroscopy research. In this article we focus on the use of supercontinuum sources to construct novel instrumentation...

  • Chemiluminescent detection of neutral gaseous radicals. Grankin, V. P.; Styrov, V. V.; Karpov, E. G. // Journal of Chemical Physics;10/7/2007, Vol. 127 Issue 13, p134709 

    This paper presents a systematic approach to the development of novel solid-state chemical sensors on the basis of heterogeneous chemiluminescence. The method is applicable for the identification and measurements of concentration of H, O, and other gaseous chemical radicals, where utilization of...

  • Photoconductive response correction for detectors of terahertz radiation. Castro-Camus, E.; Fu, L.; Lloyd-Hughes, J.; Tan, H. H.; Jagadish, C.; Johnston, M. B. // Journal of Applied Physics;Sep2008, Vol. 104 Issue 5, p053113 

    Photoconductive detectors are convenient devices for detecting pulsed terahertz radiation. We have optimized Fe+ ion-damaged InP materials for photoconductive detector signal to noise performance using dual-energy doses in the range from 2.5×1012 to 1.0×1016 cm-2. Ion implantation...

  • Photoconductive emitters advance ultrafast terahertz sources. Wahlstrand, Jared; Dekorsy, Thomas; Klatt, Gregory; Cundiff, Steven // Laser Focus World;May2011, Vol. 47 Issue 5, p77 

    The article focuses on the significance of photoconductive emitters that helps produce ultrafast terahertz radiation from optical pulses. It examines the two mechanisms of producing terahertz radiation such as the optical rectification and photoconductive emission. It also mentions the...

  • Measurement of the optical absorption spectra of epitaxial graphene from terahertz to visible. Dawlaty, Jahan M.; Shivaraman, Shriram; Strait, Jared; George, Paul; Chandrashekhar, Mvs; Rana, Farhan; Spencer, Michael G.; Veksler, Dmitry; Chen, Yunqing // Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p131905 

    We present experimental results on the optical absorption spectra of epitaxial graphene from the visible to the terahertz frequency range. In the terahertz range, the absorption is dominated by intraband processes with a frequency dependence similar to the Drude model. In the near-IR range, the...

  • Spectroscopy of thermally activated thin water layers. Karnakov, V. A.; Borisov, V. S.; Ezhova, Ya. V.; Marchuk, S. V.; Kharlan, A. R.; Shcherbachenko, L. A. // Russian Physics Journal;Aug2008, Vol. 51 Issue 8, p840 

    Thermally activated depolarization currents in a thin water interlayer enclosed between two electrically active surfaces of a muscovite crystal are investigated in a wide temperature interval. The results obtained indicate polymorphism of the crystal structure of the water interlayer and...

  • Knowing Is Half the Battle. Respini-Irwin, Cyrena // Spectroscopy;Apr2003, Vol. 18 Issue 4, p50 

    Focuses on the use of laser-induced breakdown spectroscopy to detect chemical and biological agents in the U.S. Characteristics of lasers used; Portability issues; Keys to effective antiterrorism application.

  • Arctic Mixed-Phase Clouds Simulated by a Cloud-Resolving Model: Comparison with ARM Observations and Sensitivity to Microphysics Parameterizations. Yali Luo; Kuan-Man Xu; Morrison, Hugh; McFarquhar, Greg // Journal of the Atmospheric Sciences;Apr2008, Vol. 65 Issue 4, p1285 

    Single-layer mixed-phase stratiform (MPS) Arctic clouds, which formed under conditions of large surface heat flux combined with general subsidence during a subperiod of the Atmospheric Radiation Measurement (ARM) Program’s Mixed-Phase Arctic Cloud Experiment (MPACE), are simulated with a...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics