Enhanced Photon-Phonon Interaction in WSe2 Acoustic Nanocavities

Carr AD, Ruppert C, Samusev AK, Magnabosco G, Vogel N, Linnik TL, Rushforth AW, Bayer M, Scherbakov AV, Akimov AV (2023)

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2023

Journal

ACS Photonics American Chemical Society

Publisher: American Chemical Society

Book Volume: 11

Pages Range: 1147-1155

Journal Issue: 3

DOI: 10.1021/acsphotonics.3c01601

Abstract

Acoustic nanocavities (ANCs) with resonance frequencies much above 1 GHz are prospective to be exploited in sensors and quantum operating devices. Nowadays, acoustic nanocavities fabricated from van der Waals (vdW) nanolayers allow them to exhibit resonance frequencies of the breathing acoustic mode up to f ∼ 1 THz and quality factors up to Q ∼ 103. For such high acoustic frequencies, electrical methods fail, and optical techniques are used for the generation and detection of coherent phonons. Here, we study experimentally acoustic nanocavities fabricated from WSe2 layers with thicknesses from 8 up to 130 nm deposited onto silica colloidal crystals. The substrate provides a strong mechanical support for the layers while keeping their acoustic properties the same as in membranes. We concentrate on experimental and theoretical studies of the amplitude of the optically measured acoustic signal from the breathing mode, which is the most important characteristic for acousto-optical devices. We probe the acoustic signal optically with a single wavelength in the vicinity of the exciton resonance and measure the relative changes in the reflectivity induced by coherent phonons up to 3 × 10-4 for f ∼ 100 GHz. We reveal the enhancement of photon-phonon interaction for a wide range of acoustic frequencies and show high sensitivity of the signal amplitude to the photoelastic constants governed by the deformation potential and dielectric function for photon energies near the exciton resonance. We also reveal a resonance in the photoelastic response (we call it photoelastic resonance) in the nanolayers with thickness close to the Bragg condition. The estimates show the capability of acoustic nanocavities with an exciton resonance for operations with high-frequency single phonons at an elevated temperature.

Authors with CRIS profile

Giulia Magnabosco Lehrstuhl für Partikelsynthese Nicolas Vogel Lehrstuhl für Partikelsynthese

Involved external institutions

University of Nottingham GB United Kingdom (GB) Technische Universität Dortmund DE Germany (DE)

How to cite

APA:

Carr, A.D., Ruppert, C., Samusev, A.K., Magnabosco, G., Vogel, N., Linnik, T.L.,... Akimov, A.V. (2023). Enhanced Photon-Phonon Interaction in WSe2 Acoustic Nanocavities. ACS Photonics, 11(3), 1147-1155. https://doi.org/10.1021/acsphotonics.3c01601

MLA:

Carr, Alex D., et al. "Enhanced Photon-Phonon Interaction in WSe2 Acoustic Nanocavities." ACS Photonics 11.3 (2023): 1147-1155.

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