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arXiv · 2609.34040

Multimode oscillation and its route to chaos in transverse-mode-coupled optomechanical resonators

Motoki Asano·Lalit Maharjan·Hiroshi Yamaguchi
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Abstract

Nonlinear oscillators exhibit rich collective phenomena including synchronization, bifurcation, and chaos. Experimentally accessing multimode nonlinear dynamics, however, remains challenging because low-order internal resonances readily induce mode locking and suppress stable multimode oscillation. Here, we demonstrate a transverse-mode-coupled optomechanical platform that combines engineered collective mechanical modes with optically controllable nonlinear interactions. The engineered transverse mechanical modes enable stable two- and three-mode self-sustained oscillations while suppressing trivial low-order internal resonances. By varying the laser frequency, we observe successive beat-frequency fractionalization (Δf/2 and Δf/3), followed by a broadband state exhibiting enhanced trajectory divergence consistent with deterministic chaos. These results establish transverse-mode-coupled optomechanical resonators as a scalable and tunable platform for exploring high-dimensional nonlinear dynamics in interacting mechanical networks.

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Motoki Asano, Lalit Maharjan, Hiroshi Yamaguchi. 2026-09-28. Multimode oscillation and its route to chaos in transverse-mode-coupled optomechanical resonators. https://arxiv.org/abs/2609.34040

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