Tuning of Optical Phonons in α-MoO₃–VO₂ Multilayers

Sina Abedini Dereshgi; Maria Cristina Larciprete; Marco Centini; Akshay A. Murthy; Kechao Tang; Junqiao Wu; Vinayak P. Dravid; Koray Aydin

doi:10.1021/acsami.1c12320

journal article·2021-10-20

Tuning of Optical Phonons in α-MoO₃–VO₂ Multilayers

Sina Abedini Dereshgi, Maria Cristina Larciprete, Marco Centini, Akshay A. Murthy, Kechao Tang, Junqiao Wu, Vinayak P. Dravid, Koray Aydin

ACS Applied Materials & Interfaces· Volume 13· Issue 41

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Source abstract

Abstract

Merging the properties of VO2 and van der Waals (vdW) materials has given rise to novel tunable photonic devices. Despite recent studies on the effect of the phase change of VO2 on tuning near-field optical response of phonon polaritons in the infrared range, active tuning of optical phonons (OPhs) using far-field techniques has been scarce. Here, we investigate the tunability of OPhs of α-MoO3 in a multilayer structure with VO2. Our experiments show the frequency and intensity tuning of 2 cm–1 and 11% for OPhs in the [100] direction and 2 cm–1 and 28% for OPhs in the [010] crystal direction of α-MoO3. Using the effective medium theory and dielectric models of each layer, we verify these findings with simulations. We then use loss tangent analysis and remove the effect of the substrate to understand the origin of these spectral characteristics. We expect that these findings will assist in intelligently designing tunable photonic devices for infrared applications, such as tunable camouflage and radiative cooling devices.

Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Transition Metal Oxide Nanomaterials · Thermal Radiation and Cooling Technologies · Gas Sensing Nanomaterials and Sensors

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois 60208, United States

Dipartimento di Scienze di Base ed Applicate per l’Ingegneria, Sapienza Università di Roma, Via Antonio Scarpa 16, 00161 Rome, Italy

Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States

International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States

Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Northwestern University Atomic and Nanoscale Characterization Experimental Center (NUANCE), Northwestern University, Evanston, Illinois 60208, United States

Funding

Air Force Office of Scientific Research · Office of Naval Research · Division of Electrical, Communications and Cyber Systems · Northwestern University · Division of Materials Research

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