Coherent control of flexural vibrations in dual-nanoweb fibers using phase-modulated two-frequency light

TL;DR

This paper demonstrates a novel method for controlling flexural vibrations in dual-nanoweb fibers using phase-modulated two-frequency light, enabling precise, stable manipulation of vibrations without interference from back-action effects.

Contribution

It introduces a new approach to coherent control via stimulated Raman-like scattering that decouples vibration amplitude from optical power, demonstrated experimentally in dual-nanoweb fibers.

Findings

Coherent control achieved along entire fiber length.

Vibration amplitude can be tuned by phase modulation.

Sequential phase switching reduces vibrations to a controllable steady state.

Abstract

Coherent control of the resonant response in spatially extended optomechanical structures is complicated by the fact that the optical drive is affected by the back-action from the generated phonons. Here we report a new approach to coherent control based on stimulated Raman-like scattering, in which the optical pressure can remain unaffected by the induced vibrations even in the regime of strong optomechanical interactions. We demonstrate experimentally coherent control of flexural vibrations simultaneously along the whole length of a dual-nanoweb fiber, by imprinting steps in the relative phase between the components of a two-frequency pump signal,the beat frequency being chosen to match a flexural resonance. Furthermore, sequential switching of the relative phase at time intervals shorter than the lifetime of the vibrations reduces their amplitude to a constant value that is fully adjustable by tuning the phase-modulation depth and switching rate. The results may trigger new developments in silicon photonics, since such coherent control uniquely decouples the amplitude of optomechanical oscillations from power-dependent thermal effects and nonlinear optical loss.