1,721,240 research outputs found
Phase-Locked Second Harmonic Generation in Thin Films with Near-Zero Permittivity
No full textNonlinear processes are enhanced enormously in slabs of materials exhibiting resonant plasma features. We show the importance of phase-locked harmonic components in scenarios where absorption at the harmonic frequency is not negligible. © OSA 2013
Absorption of harmonic light in plasmonic nanostructures
No full textSurface plasmons are known for their ability to provide large field enhancement at the interface between a metal and another medium. They can be observed in a variety of structures ranging from plain metallic films to nanoparticles and gratings. Thanks to their large electric field enhancement, surface plasmons have also been exploited for the enhancement of second and third harmonic generation. In fact, metals possess a relatively high third order susceptibility and, although dipole-allowed quadratic nonlinearities are not present in the bulk, they also display an effective second order response that arises from symmetry breaking at the surface, magnetic dipoles (Lorentz force), inner-core electrons, convective nonlinear sources, and electron gas pressure. While much attention has been devoted to achieve efficient excitation of surface plasmons to improve far-field harmonic generation, little or no attention has been paid to the dissipation of the generated harmonic light. Therefore, we undertake a discussion of both harmonic generation and absorption in simple metallic/dielectric interfaces with or without excitation of surface plasmons. We demonstrate that, despite the best efforts embarked upon to study plasmon excitation, the absorbed harmonic energy can far surpass the energy emitted in the far-field. These findings suggest that quantification of the absorbed harmonic light should be an important parameter in evaluating designs of plasmonic nanostructures for frequency mixing
Anomalous nonlinear absorption in epsilon-near-zero materials: Optical limiting and all-optical control
No full textENZ materials and anisotropy: enhancing nonlinear optical interactions at the nanoscale
Full text linkHarmonic generation in anisotropic ENZ: Impact of nonlocalities and hot electrons
No full textWe analyze the impact of nonlocalities and hot electrons on second and third harmonic generation in anisotropic epsilon-near-zero nanostructures. Our results reveal that these contributions significantly modify both linear and nonlinear response
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