The Role of Optical Phonon Confinement in The Infrared Dielectric Response of III-V Superlattices

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Author(s)Matson, Joseph R.
Author(s)Alam, Md Nazmul
Author(s)Varnavides, Georgios
Author(s)Sohr, Patrick
Author(s)Knight, Sean
Author(s)Darakchieva, Vanya
Author(s)Stokey, Megan
Author(s)Schubert, Mathias
Author(s)Said, Ayman
Author(s)Beechem, Thomas
Author(s)Narang, Prineha
Author(s)Law, Stephanie
Author(s)Caldwell, Joshua D.
Date Accessioned2024-01-03T16:32:27Z
Date Available2024-01-03T16:32:27Z
Publication Date2023-12-01
DescriptionThis is the peer reviewed version of the following article: Matson, J. R., Alam, M. N., Varnavides, G., Sohr, P., Knight, S., Darakchieva, V., Stokey, M., Schubert, M., Said, A., Beechem, T., Narang, P., Law, S., Caldwell, J. D., The Role of Optical Phonon Confinement in The Infrared Dielectric Response of III-V Superlattices. Adv. Mater. 2023, 2305106. https://doi.org/10.1002/adma.202305106, which has been published in final form at https://doi.org/10.1002/adma.202305106. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. This article is protected by copyright. All rights reserved. This article will be embargoed until 12/01/2024.© 2023 Wiley-VCH GmbH
AbstractPolar dielectrics are key materials of interest for infrared (IR) nanophotonic applications due to their ability to host phonon-polaritons (PhPs) that allow for low-loss, subdiffractional control of light. The properties of phonon-polaritons are limited by the characteristics of optical phonons, which are nominally fixed for most “bulk” materials. Superlattices composed of alternating atomically-thin materials offer control over crystal anisotropy through changes in composition, optical phonon confinement, and the emergence of new modes. In particular, the modified optical phonons in superlattices offer the potential for so-called crystalline hybrids whose IR properties cannot be described as a simple mixture of the bulk constituents. To date, however, studies have primarily focused on identifying the presence of new or modified optical phonon modes rather than assessing their impact on the IR response. This study focuses on assessing the impact of confined optical phonon modes on the hybrid IR dielectric function in superlattices of GaSb and AlSb. Using a combination of first principles theory, Raman, FTIR, and spectroscopic ellipsometry, the hybrid dielectric function is found to track with the confinement of optical phonons, leading to optical phonon spectral shifts of up to 20 cm−1. These results provide an alternative pathway towards designer IR optical materials.
SponsorJ.M. and G.V. acknowledge funding from the National Science Foundation under grant NSF-DMR-1904793., while J.D.C. was supported by the Office of Naval Research grant #N00014-22-1-2035. M.S. acknowledges support by the National Science Foundation (NSF) under awards DMR 1808715 and OIA-2044049, by Air Force Office of Scientific Research under awards FA9550-18-1-0360, FA9550-19-S-0003, and FA9550-21-1-0259, by the Knut and Alice Wallenbergs Foundation award 'Wide-bandgap semiconductors for next generation quantum components', and by the J.A.Woollam Foundation. M. N. A., P. S. and S. L. acknowledge funding from the National Science Foundation, Division of Materials Research under Award No. 1904760. M.N.A., P. S., and S.L. acknowledge the use of the Materials Growth Facility (MGF) at the University of Delaware, which is partially supported by the National Science Foundation Major Research Instrumentation under Grant No. 1828141 and UD-CHARM a National Science Foundation MRSEC under Award No. DMR- 2011824. This research used resources of the Oak Ridge Leadership Computing Facility, which is a DOE Office of Science User Facility supported under Contract DE-AC05-00OR22725 as well as the resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DEAC02- 05CH11231. P.N. is a Moore Inventor Fellow and gratefully acknowledges support through Grant No. GBMF8048 from the Gordon and Betty Moore Foundation. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science user facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
CitationMatson, J. R., Alam, M. N., Varnavides, G., Sohr, P., Knight, S., Darakchieva, V., Stokey, M., Schubert, M., Said, A., Beechem, T., Narang, P., Law, S., Caldwell, J. D., The Role of Optical Phonon Confinement in The Infrared Dielectric Response of III-V Superlattices. Adv. Mater. 2023, 2305106. https://doi.org/10.1002/adma.202305106
ISSN1521-4095
URLhttps://udspace.udel.edu/handle/19716/33758
Languageen_US
PublisherAdvanced Materials
Keywordsconfinement
Keywordsinfrared
Keywordsphonons
Keywordsspectroscopy
TitleThe Role of Optical Phonon Confinement in The Infrared Dielectric Response of III-V Superlattices
TypeArticle
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