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- Title
An analysis of Kerr nonlinearity in negative index material and its effect on material characteristics.
- Authors
Das, Abhijeet; Neog, Dimishree; Hazarika, Chironjit; Hazarika, Subrata
- Abstract
Optics of negative index material is known for its unconventional results. In the perspective of nonlinear optics, it has a revolutionary impact. We, thus, investigate the effect of Kerr nonlinearity on the characteristics of a representative isotropic, frequency independent negative index material by defining an intensity-dependent effective permittivity and compare it to that in positive index material. Using the intensity-dependent permittivity, responses of essential characteristic features like phase and group velocities are studied and found to exhibit unconventional behavior with incident field intensity in the negative index material. At a threshold intensity, i.e., at an intensity at which effective permittivity vanishes, the material shows features of epsilon near zero and/or near zero index materials i.e., a diverging phase velocity with zero group velocity. The study shows the prospect of altering or tailoring characteristic features of a negative index material by tuning the field intensity of the propagating wave or pulse in the material.
- Subjects
GROUP velocity; NONLINEAR optics; PERMITTIVITY; OPTICS
- Publication
Journal of Nonlinear Optical Physics & Materials, 2024, Vol 33, Issue 6, p1
- ISSN
0218-8635
- Publication type
Article
- DOI
10.1142/S0218863523500649