Observations of temporal group delays in slow-light multiple coupled photonic crystal cavities

TL;DR

This paper demonstrates controllable temporal group delays in coupled photonic crystal cavities, enabling advanced optical pulse manipulation on a chip-scale platform with potential applications in quantum information processing.

Contribution

It introduces a method to achieve and control large group delays in multi-cavity photonic crystals using a multi-pump approach supported by simulations and theoretical analysis.

Findings

Achieved up to 4x the single cavity lifetime in group delay.

Controlled multi-cavity resonances and phase for transparency peaks.

Demonstrated scalability for chip-scale optical pulse trapping.

Abstract

We demonstrate temporal group delays in coherently-coupled high-Q multi-cavity photonic crystals, in an all-optical analogue to electromagnetically induced transparency. We report deterministic control of the group delay up to 4x the single cavity lifetime in our CMOS-fabricated room-temperature chip. Supported by three-dimensional numerical simulations and theoretical analyses, our multi-pump beam approach enables control of the multi-cavity resonances and inter-cavity phase, in both single and double transparency peaks. The standing-wave wavelength-scale photon localization allows direct scalability for chip-scale optical pulse trapping and coupled-cavity QED.