Modulation instability with arbitrarily high perturbation frequencies in metamaterials with nonlinear dispersion and saturable nonlinearity

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Original languageEnglish
Pages (from-to)1484-1493
Journal / PublicationJournal of the Optical Society of America B: Optical Physics
Volume31
Issue number7
Publication statusPublished - 1 Jul 2014

Abstract

We present an analytical study of modulation instability (MI) in metamaterial (MM) with first-order and secondorder nonlinear dispersion for three types of saturable nonlinearity. Apart from the conventional MI gain spectrum, we find two additional MI gain spectra that arise from the second-order nonlinear dispersion in the MM (provided that the group-velocity dispersion does not vanish): one showing a low cutoff frequency but no high cutoff frequency and the other showing no cutoff frequency. Under certain conditions, a threshold power may be required for MI to occur. These MI gain spectra rarely exist in conventional materials and suggest the possibility of observing MI at arbitrarily high perturbation frequencies, which could be explored for the generation of highrepetition- rate ultrashort electromagnetic pulse trains. © 2014 Optical Society of America.

Citation Format(s)

Modulation instability with arbitrarily high perturbation frequencies in metamaterials with nonlinear dispersion and saturable nonlinearity. / Zhong, Xianqiong; Cheng, Ke; Chiang, Kin Seng.

In: Journal of the Optical Society of America B: Optical Physics, Vol. 31, No. 7, 01.07.2014, p. 1484-1493.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal