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Research and innovation | REF: RE144 V1

Terahertz spectroscopy

Authors: Jean-Christophe DELAGNES, Patrick MOUNAIX

Publication date: May 10, 2010, Review date: February 18, 2020 | Lire en français

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    Overview

    ABSTRACT

    Terahertz impulse spectroscopy provides a considerable amount of information on physico-chemical systems: refractive index, absorption, relaxation time. Concerning the terahertz wavelength spectroscopy (THz = 1012 Hz 1), it is possible to measure directly the electric field of the pulse and therefore its spectrum in amplitude and phase. The full dielectric response can thus be extracted. In the relative short term, by combining imaging and broadband spectroscopy, terahertz waves could be used for innovative applications. This article reviews various state-of-the-art terahertz spectroscopy techniques.

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    AUTHORS

    • Jean-Christophe DELAGNES: Senior Lecturer at the Centre de Physique Moléculaire Optique et Hertzienne (CPMOH UMR 5798) in Talence (33).

    • Patrick MOUNAIX: CNRS Research Fellow at the Centre de Physique Moléculaire Optique et Hertzienne (CPMOH UMR 5798) in Talence (33).

     INTRODUCTION

    Abstract: Pulse spectroscopy provides a considerable amount of information on physico-chemical systems: refractive index, absorption, relaxation time. In the case of spectroscopy at terahertz wavelengths (1 THz = 1012 Hz), it is possible to measure the electric field of the pulse directly, and thus its spectrum in amplitude and phase. The complete dielectric response can thus be extracted. In the relatively short term, by combining imaging and broadband spectroscopy, terahertz waves could find innovative applications.

    Abstract: Time domain and Time dependent spectroscopy are powerful tools for physical and chemical analysis. It gives access to numerous information such as refractive index, absorption, relaxation time. In the terahertz range (1 THz = 1012 Hz), the spectroscopy has a key advantage since it is possible to directly measure the electric field of the pulse, and thus the spectrum in amplitude and phase. In relatively short term, by combining gimaging and broadband spectroscopy, the terahertz waves could find innovative applications...

    Keywords: Terahertz, Spectroscopy, Pump-Probe, Femtosecond Picosecond, Transient response

    Keywords: Terahertz, Spectroscopy, Pump-Probe, Femtosecond Picosecond, Transient response

    Summary sheet

    Field: Analytical techniques and spectroscopy

    Degree of technology diffusion: Emergence / Growth / Maturity

    Technologies involved: Optics, electronics, optronics, signal processing

    Applications: Biology, environment, safety

    Main French players :

    Competitive clusters: Pôle de compétitivité Route des Lasers™ (Aquitaine)

    Competence centers: Centre de Physique Moléculaire Optique et Hertzienne CPMOH (CNRS), Centre technologique Alphanov, ARMIR (Association pour le Rayonnement, les Mesures et l'Imagerie Rapide), which includes a "Teranaute" club made up of a dozen university laboratories, major organizations and industrialists working in the terahertz wave field. GDR Européen TERAHERTZ " Détecteurs et Émetteurs de Radiations Térahertz à Semi-conducteurs " (GDR CNRS 2897). This GDR federates collaboration between some twenty European laboratories working in the field of semiconductor components for THz wave technology.

    Examples of global players: Nikon, Picometrix, Toptica Photonics, GigaOptics

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