Journal article
Tailoring Phonon-Driven Responses in α-MoO 3 through Isotopic Enrichment
Advanced materials (Weinheim), Vol.38(39), e73629
06/11/2026
DOI: 10.1002/adma.73629
PMID: 42273746
Abstract
The implementation of polaritonic materials into nanoscale devices requires selective tuning of parameters to realize desired spectral or thermal responses. One robust material, α-MoO3, an orthorhombic crystal boasting three distinct phonon dispersions, provides three polaritonic dispersions of hyperbolic phonon polaritons (HPhPs) across the mid-infrared (MIR). Here, the tunability of both optical and thermal responses in isotopically enriched α-MoO3 (98MoO3, Mo18O3, and 98Mo18O3) is explored. A uniform ∼5% spectral redshift from 18O enrichment is observed in both Raman- and IR-active TO phonons. Both the in- and out-of-plane thermal conductivities for the isotopic variations are reported. Ab initio calculations both replicate experimental findings and analyze the select-mode three-phonon scattering contributions. The HPhPs from each isotopic variation are probed with s-SNOM, and we report an HPhP Q-factor maxima increase in 98Mo18O3 of ∼50% along the [100] in the RB2 and ∼100% along the [001] in the RB3 with respect to 98MoO3. Observations in both real and Fourier space of higher-order HPhP modes propagating in slabs of isotopically enriched α-MoO3 without the use of a subdiffractional surface scatterer are presented here. This work establishes the dual-element isotope enrichment of α-MoO3 as an intrinsic strategy to design optical, thermal, and polaritonic properties.
Details
- Title: Subtitle
- Tailoring Phonon-Driven Responses in α-MoO 3 through Isotopic Enrichment
- Creators
- Thiago S Arnaud - Vanderbilt UniversityRyan W Spangler - Pennsylvania State UniversityJohnathan D Georgaras - Stanford UniversityJonah B Haber - Stanford UniversityDaniel Hirt - University of VirginiaMaximilian Obst - Technische Universität DresdenGonzalo Álvarez-Pérez - Fritz Haber Institute of the Max Planck SocietyMackey Long Iii - Vanderbilt UniversityFelix G Kaps - Technische Universität DresdenJakob Wetzel - Technische Universität DresdenCourtney Ragle - Vanderbilt UniversityJohn E Buchner - Vanderbilt UniversityYoungji Kim - Vanderbilt UniversityAditha S Senarath - Vanderbilt UniversityRicharda Niemann - Vanderbilt UniversityMingze He - Vanderbilt UniversityGiulia Carini - Fritz Haber Institute of the Max Planck SocietyUnai Arregui-Leon - Politecnico di MilanoAkash C Behera - Fritz Haber Institute of the Max Planck SocietyRamachandra Bangari - University of IowaNihar Sahoo - University of IowaNiels C Brumby - Fritz Haber Institute of the Max Planck SocietyJ Michael Klopf - Helmholtz-Zentrum Dresden-RossendorfMartin Wolf - Fritz Haber Institute of the Max Planck SocietyLukas M Eng - Technische Universität DresdenSusanne C Kehr - Technische Universität DresdenThomas G Folland - University of IowaAlexander Paarmann - Fritz Haber Institute of the Max Planck SocietyPatrick E Hopkins - University of VirginiaFelipe Jornada - Stanford UniversityJon-Paul Maria - Pennsylvania State UniversityJoshua D Caldwell - Vanderbilt University
- Resource Type
- Journal article
- Publication Details
- Advanced materials (Weinheim), Vol.38(39), e73629
- DOI
- 10.1002/adma.73629
- PMID
- 42273746
- NLM abbreviation
- Adv Mater
- ISSN
- 0935-9648
- eISSN
- 1521-4095
- Publisher
- Wiley
- Grant note
- 2022LENW33-CUP / European Union - Next Generation EU - PNRR - M4C2 2406022 / National Science Foundation 1818253 / National Science Foundation 390858490 / Germany's Excellence Strategy 101209198 / European Union N00014-23-1-2567 / Office of Naval Research MURI W911NF-21-1-0119 / Army Research Office N00014-26-1-2076 / Office of Naval Research 05K22ODA / Federal Ministry of Education and Research Basic Energy Sciences
- Language
- English
- Electronic publication date
- 06/11/2026
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9985174610102771
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