@Article{Hase_etal2012,
author="Hase, Muneaki
and Katsuragawa, Masayuki
and Constantinescu, Anca Monia
and Petek, Hrvoje",
title="Frequency comb generation at terahertz frequencies by coherent phonon excitation in silicon",
journal="Nature Photonics",
year="2012",
volume="6",
pages="243--247",
optkeywords="fromIPMRAS",
abstract="High-order nonlinear light--matter interactions in gases enable the generation of X-ray and attosecond light pulses, metrology and spectroscopy1. Optical nonlinearities in solid-state materials are particularly interesting for combining optical and electronic functions for high-bandwidth information processing2. Third-order nonlinear optical processes in silicon have been used to process optical signals with bandwidths greater than 1 GHz (ref. 2). However, fundamental physical processes for a silicon-based optical modulator in the terahertz bandwidth range have not yet been explored. Here, we demonstrate ultrafast phononic modulation of the optical index of silicon by irradiation with intense few-cycle femtosecond pulses. The anisotropic reflectivity modulation by the resonant Raman susceptibility at the fundamental frequency of the longitudinal optical phonon of silicon (15.6 THz) generates a frequency comb up to seventh order. All-optical >100 THz frequency comb generation is realized by harnessing the coherent atomic motion of the silicon crystalline lattice at its highest mechanical frequency.",
optnote="exported from refbase (https://db.rplab.ru/refbase/show.php?record=794), last updated on Wed, 09 May 2012 11:30:28 -0500"
}