Pulse Compression by an Optical Push Broom On a Chip
Abstract
In this study, we report a first experimental demonstration of pulse compression by a gradual refractive index front moving in a periodically modulated silicon waveguide, the so-called optical push broom effect. Optical push broom captures and confines the input signal pulse in a faster propagating refractive index front, driven by a pump pulse. This is a spatio-temporal analogue of light trapping in a tapered plasmonic waveguide where light is continuously changing its wavevector approaching zero group velocity and, thus, stopped without reflection. Here the signal is accelerated by the front until the signal velocity matches the front velocity, thus stopping the light in respect to the front. We employ the slowly varying envelope approximation to model this phenomenon. Notably, we well reproduced the experimental frequency shift at the output corresponding to the temporal delay at the input.
Cite
@article{arxiv.2502.11892,
title = {Pulse Compression by an Optical Push Broom On a Chip},
author = {Boyi Zhang and Maurice Pfeiffer and Mahmoud A. Gaafar and He Li and Xinlun Cai and Juntao Li and Manfred Eich and Alexander Yu. Petrov},
journal= {arXiv preprint arXiv:2502.11892},
year = {2025}
}