Singularity-driven Second and Third Harmonic Generation in a ε-near-zero nanolayer

Details Singularity-driven Second and Third Harmonic Generation in a ε-near-zero nanolayer Singularity-driven Second and Third Harmonic Generation in a ε-near-zero nanolayer

2011-07-12

arxiv.org/abs/1107.2354v2

Physics

Optics

Scientific paper

We show a new path to {\epsilon}~0 materials without resorting to metal-based metamaterial composites. A medium that can be modeled using Lorentz oscillators usually displays {\epsilon}=0 crossing points, e.g. {\epsilon}=0 at {\lambda}~7{\mu}m and 20{\mu}m for SiO2 and CaF2, respectively. We show that a Lorentz medium yields a singularity-driven enhancement of the electric field followed by dramatic lowering of thresholds for a plethora of nonlinear optical phenomena. We illustrate the remarkable enhancement of second and third harmonic generation in a layer of {\epsilon}~0 material 20nm thick, and discuss the role of nonlinear surface sources.

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