Thermoelastic surface acoustic waves in low-loss silicon nitride integrated circuits
Abstract
Acousto-optic modulation in photonic integrated circuits harness the applications that include signal processing, quantum photonics and microwave photonics. However, silicon nitride (), as a main-stream low-loss scalable photonic platform, suffers from the lack of piezoelectric effect and therefore the hybrid co-integration with other materials is always required for acousto-optic modulation. Here, we employed thermoelastic surface acoustic waves (SAW) in a 8 dB/m propagation loss integrated circuits without adding extra materials. A phase modulation efficiency enhancement of 13.6 dB is realized with a multi-pass configuration. Furthermore, a single-sideband intermodal scattering with a suppression ratio of 8 dB is measured and an intensity modulation is observed by incorporating the phase modulation into a ring resonator spectral. This thermoelastic SAW technique, as an initial step of acousto-optic modulation in low-loss platform, is promising for integrated microwave photonics and programmable photonics applications.
Cite
@article{arxiv.2602.06732,
title = {Thermoelastic surface acoustic waves in low-loss silicon nitride integrated circuits},
author = {Zheng Zheng and Ahmet Tarık Işık and Akshay Keloth and Kaixuan Ye and Peter van der Slot and David Marpaung},
journal= {arXiv preprint arXiv:2602.06732},
year = {2026}
}