Lifting restrictions on coherence loss when characterizing non-transparent hypersonic phononic crystals

Abstract Hypersonic phononic bandgap structures confine acoustic vibrations whose wavelength is commensurate with that of light, and have been studied using either time- or frequency-domain optical spectroscopy. Pulsed pump-probe lasers are the preferred instruments for characterizing periodic multi...

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Main Authors:	Konrad Rolle, Dmytro Yaremkevich, Alexey V. Scherbakov, Manfred Bayer, George Fytas
Format:	article
Language:	EN
Published:	Nature Portfolio 2021
Subjects:	Medicine R Science Q
Online Access:	https://doaj.org/article/54e051ed26e04ccd813a008ff5b9c766
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spelling	oai:doaj.org-article:54e051ed26e04ccd813a008ff5b9c7662021-12-02T19:02:40ZLifting restrictions on coherence loss when characterizing non-transparent hypersonic phononic crystals10.1038/s41598-021-96663-32045-2322https://doaj.org/article/54e051ed26e04ccd813a008ff5b9c7662021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96663-3https://doaj.org/toc/2045-2322Abstract Hypersonic phononic bandgap structures confine acoustic vibrations whose wavelength is commensurate with that of light, and have been studied using either time- or frequency-domain optical spectroscopy. Pulsed pump-probe lasers are the preferred instruments for characterizing periodic multilayer stacks from common vacuum deposition techniques, but the detection mechanism requires the injected sound wave to maintain coherence during propagation. Beyond acoustic Bragg mirrors, frequency-domain studies using a tandem Fabry–Perot interferometer (TFPI) find dispersions of two- and three-dimensional phononic crystals (PnCs) even for highly disordered samples, but with the caveat that PnCs must be transparent. Here, we demonstrate a hybrid technique for overcoming the limitations that time- and frequency-domain approaches exhibit separately. Accordingly, we inject coherent phonons into a non-transparent PnC using a pulsed laser and acquire the acoustic transmission spectrum on a TFPI, where pumped appear alongside spontaneously excited (i.e. incoherent) phonons. Choosing a metallic Bragg mirror for illustration, we determine the bandgap and compare with conventional time-domain spectroscopy, finding resolution of the hybrid approach to match that of a state-of-the-art asynchronous optical sampling setup. Thus, the hybrid pump–probe technique retains key performance features of the established one and going forward will likely be preferred for disordered samples.Konrad RolleDmytro YaremkevichAlexey V. ScherbakovManfred BayerGeorge FytasNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Konrad Rolle Dmytro Yaremkevich Alexey V. Scherbakov Manfred Bayer George Fytas Lifting restrictions on coherence loss when characterizing non-transparent hypersonic phononic crystals
description	Abstract Hypersonic phononic bandgap structures confine acoustic vibrations whose wavelength is commensurate with that of light, and have been studied using either time- or frequency-domain optical spectroscopy. Pulsed pump-probe lasers are the preferred instruments for characterizing periodic multilayer stacks from common vacuum deposition techniques, but the detection mechanism requires the injected sound wave to maintain coherence during propagation. Beyond acoustic Bragg mirrors, frequency-domain studies using a tandem Fabry–Perot interferometer (TFPI) find dispersions of two- and three-dimensional phononic crystals (PnCs) even for highly disordered samples, but with the caveat that PnCs must be transparent. Here, we demonstrate a hybrid technique for overcoming the limitations that time- and frequency-domain approaches exhibit separately. Accordingly, we inject coherent phonons into a non-transparent PnC using a pulsed laser and acquire the acoustic transmission spectrum on a TFPI, where pumped appear alongside spontaneously excited (i.e. incoherent) phonons. Choosing a metallic Bragg mirror for illustration, we determine the bandgap and compare with conventional time-domain spectroscopy, finding resolution of the hybrid approach to match that of a state-of-the-art asynchronous optical sampling setup. Thus, the hybrid pump–probe technique retains key performance features of the established one and going forward will likely be preferred for disordered samples.
format	article
author	Konrad Rolle Dmytro Yaremkevich Alexey V. Scherbakov Manfred Bayer George Fytas
author_facet	Konrad Rolle Dmytro Yaremkevich Alexey V. Scherbakov Manfred Bayer George Fytas
author_sort	Konrad Rolle
title	Lifting restrictions on coherence loss when characterizing non-transparent hypersonic phononic crystals
title_short	Lifting restrictions on coherence loss when characterizing non-transparent hypersonic phononic crystals
title_full	Lifting restrictions on coherence loss when characterizing non-transparent hypersonic phononic crystals
title_fullStr	Lifting restrictions on coherence loss when characterizing non-transparent hypersonic phononic crystals
title_full_unstemmed	Lifting restrictions on coherence loss when characterizing non-transparent hypersonic phononic crystals
title_sort	lifting restrictions on coherence loss when characterizing non-transparent hypersonic phononic crystals
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/54e051ed26e04ccd813a008ff5b9c766
work_keys_str_mv	AT konradrolle liftingrestrictionsoncoherencelosswhencharacterizingnontransparenthypersonicphononiccrystals AT dmytroyaremkevich liftingrestrictionsoncoherencelosswhencharacterizingnontransparenthypersonicphononiccrystals AT alexeyvscherbakov liftingrestrictionsoncoherencelosswhencharacterizingnontransparenthypersonicphononiccrystals AT manfredbayer liftingrestrictionsoncoherencelosswhencharacterizingnontransparenthypersonicphononiccrystals AT georgefytas liftingrestrictionsoncoherencelosswhencharacterizingnontransparenthypersonicphononiccrystals
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Lifting restrictions on coherence loss when characterizing non-transparent hypersonic phononic crystals

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