title: On-chip two-octave supercontinuum generation by enhancing self-steepening of optical pulses.
abstract: Dramatic advances in supercontinuum generation have been made recently using photonic crystal fibers, but it is quite challenging to obtain an octave-spanning supercontinuum on a chip, partially because of strong dispersion in high-index-contrast nonlinear integrated waveguides. We show by simulation that extremely flat and low dispersion can be achieved in silicon nitride slot waveguides over a wavelength band of 500 nm. Different from most of previously reported supercontinua that were generated either by higher-order soliton fission in anomalous dispersion regime or by self-phase modulation in normal dispersion regime, a two-octave supercontinuum from 630 to 2650 nm (360 THz in total) can be generated by enhancing self-steepening in pulse propagation in nearly zero dispersion regime, when an optical shock as short as 3 fs is formed.
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA. linzhang@usc.edu
authors.forename: Lin
authors.initials: L
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Yan
authors.forename: Yang
authors.initials: Y
authors.lastname: Yue
authors.forename: Qiang
authors.initials: Q
authors.lastname: Lin
authors.forename: Oskar
authors.initials: O
authors.lastname: Painter
authors.forename: Raymond G
authors.initials: RG
authors.lastname: Beausoleil
authors.forename: Alan E
authors.initials: AE
authors.lastname: Willner