NDLI: Modulation instability in second harmonic generation in metamaterials with quadratic nonlinearity

Content Provider	Springer Nature Link
Author	Zhang, Lingling Dai, Xiaoyu Xiang, Yuanjiang Wen, Shuangchun
Copyright Year	2015
Abstract	Modulation instability (MI) in second harmonic generation in metamaterials (MMs) with quadratic nonlinearity is studied. The analytical expressions for MI gain spectra are obtained, from which the generation condition of MI and the respective roles of dispersion, group velocity mismatch and phase mismatch in MI are identified. It is found that the region of phase mismatch where the MI can take place in MMs is in contrast with its counterpart in conventional materials due to the negative wave vector direction. The MI gains mainly rely on the phase mismatch. Since magnetic permeability is dominant for negative refraction, so the refractive index difference of the fundamental frequency (FF) and second harmonic (SH) wave can fluctuate in a large range in MMs. While the frequency is near the critical point, the refractive index difference of the FF and SH wave is small, so the phase mismatch is small and the MI gain is low. However, while the frequency is far away from the critical point, the refractive index difference of the FF and SH wave becomes large, this leads to a large phase mismatch, and the giant gain with more sidelobes can be obtained for the large phase mismatch occurring in MMs with quadratic nonlinearity.
Starting Page	465
Ending Page	472
Page Count	8
File Format	PDF
ISSN	09462171
Journal	Applied Physics B
Volume Number	121
Issue Number	4
e-ISSN	14320649
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-11-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physics Physical Chemistry Laser Technology, Photonics Quantum Optics Optics, Optoelectronics, Plasmonics and Optical Devices Engineering
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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