All-optical two-color terahertz emission from quasi-2D nonlinear surfaces

Totero Gongora, J.S., Peters, L., Tunesi, J., Cecconi, V., Clerici, M. , Pasquazi, A. and Peccianti, M. (2020) All-optical two-color terahertz emission from quasi-2D nonlinear surfaces. Physical Review Letters, 125(26), 263901. (doi: 10.1103/PhysRevLett.125.263901)

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Two-color terahertz (THz) generation is a field-matter process combining an optical pulse and its second harmonic. Its application in condensed matter is challenged by the lack of phase matching among multiple interacting fields. Here, we demonstrate phase-matching-free two-color THz conversion in condensed matter by introducing a highly resonant absorptive system. The generation is driven by a third-order nonlinear interaction localized at the surface of a narrow-band-gap semiconductor, and depends directly on the relative phase between the two colors. We show how to isolate the third-order effect among other competitive THz-emitting surface mechanisms, exposing the general features of the two-color process.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Clerici, Professor Matteo
Authors: Totero Gongora, J.S., Peters, L., Tunesi, J., Cecconi, V., Clerici, M., Pasquazi, A., and Peccianti, M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114
Published Online:21 December 2020
Copyright Holders:Copyright © 2020 American Physical Society
First Published:First published in Physical Review Letters 125(26): 263901
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
302459Infrared time-domain quantum opticsMatteo ClericiEngineering and Physical Sciences Research Council (EPSRC)EP/S001573/1ENG - Electronics & Nanoscale Engineering