Coherent Control of Ultra-High Frequency Acoustic Resonances in Photonic Crystal Fibers

TL;DR

This paper demonstrates coherent control of 2 GHz acoustic resonances in photonic crystal fibers using laser pulses, achieving significant amplitude modulation through interference, supported by theory and simulations.

Contribution

It introduces a method to coherently control high-frequency acoustic resonances in photonic crystal fibers with laser pulse sequences, combining experimental, theoretical, and numerical approaches.

Findings

Achieved 100-fold increase in vibrational amplitude with pulse sequences

Demonstrated suppression of acoustic vibrations through destructive interference

Validated results with semi-analytical theory and numerical simulations

Abstract

Ultra-high frequency acoustic resonances ($\backsim$2 GHz) trapped within the glass core ($\backsim$1 $\mu$m diameter) of a photonic crystal fiber are selectively excited through electrostriction using laser pulses of duration 100 ps and energy 500 pJ. Using precisely timed sequences of such driving pulses, we achieve coherent control of the acoustic resonances by constructive or destructive interference, demonstrating both enhancement and suppression of the vibrations. A sequence of 27 resonantly-timed pulses provides a 100-fold increase in the amplitude of the vibrational mode. The results are explained and interpreted using a semi-analytical theory, and supported by precise numerical simulations of the complex light-matter interaction.