Ultrafast acoustic modulation of second-harmonic generation in monolayer transition metal dichalcogenides

Abstract

High-speed modulation and deterministic control of optical nonlinear processes in nanomaterials are essential for realizing future nanoscale optoelectronic devices. Applying strain is a ubiquitous and versatile approach to deform atomically thin materials, allowing direct modification of their electronic and optical properties. Yet, strain engineering of nonlinear processes has so far relied predominantly on static approaches, which inherently limit modulation speed, reproducibility, and device scalability. Here, we demonstrate ultrafast acoustic modulation of second-harmonic (SH) generation in monolayer transition metal dichalcogenides using surface acoustic waves (SAWs). By employing a fully phase-synchronized SH measurement combined with stroboscopic surface displacement detection, we directly visualize dynamic SH modulation at a frequency of 226 MHz. Moreover, theoretical modeling and determination of photoelastic coefficients enable quantitative extraction of the SAW-induced dynamic strain. Our results establish a direct link between acoustic fields and optical nonlinearities, providing a robust platform for dynamic strain engineering in two-dimensional nanophotonic devices.

arXiv comment9 pages, 4 figures

References in corpus (15)

• Electric Field Effect in Atomically Thin Carbon Films
• Observation of Intense Second Harmonic Generation from MoS${}_2$ Atomic Crystals
• Second harmonic microscopy of monolayer MoS2
• Electrical Control of Second-Harmonic Generation in a WSe2 Monolayer Transistor
• Irradiation of Nanostrained Monolayer WSe${}_2$ for Site-Controlled Single-Photon Emission up to 150 K
• Optical imaging of strain in two-dimensional crystals
• Quantum Nanophotonics in Two-Dimensional Materials
• All-optical polarization and amplitude modulation of second-harmonic generation in atomically thin semiconductors
• Spatiotemporally Controlled Room Temperature Exciton Transport under Dynamic Pressure
• Valley Polarization-Electric Dipole Interference and Nonlinear Chiral Selection Rules in Monolayer WSe${}_2$
• Quantization of mode shifts in nanocavities integrated with atomically thin sheets
• Spatiotemporal visualization of a surface acoustic wave coupled to magnons across a submillimeter-long sample by pulsed laser interferometry
• Van der Waals functionalization of ultrahigh-Q silica microcavities for ${\chi }^{(2)}$-${\chi }^{(3)}$ hybrid nonlinear photonics
• Strain-Enabled Giant Second-Order Susceptibility in Monolayer WSe${}_2$
• Ultrafast Coherent Bandgap Modulation Probed by Parametric Nonlinear Optics