Publication

Enhanced second harmonic generation from InAs nano-wing structures on silicon

Anna Fontcuberta i Morral, Eleonora Russo, Anna Dalmau Mallorquí, Ignasi Canales Mundet
2013
Journal Articles

Abstract

We demonstrate morphology-dependent second-harmonic generation (SHG) from InAs V-shaped nanomembranes. We show SHG correlation with the nano-wing shape and size, experimentally quantify the SHG efficiency, and demonstrate a maximum SHG enhancement of about 500 compared to the bulk. Experimental data are supported by rigorous calculations of local electromagnetic field spectra.

Official source

https://infoscience.epfl.ch/entities/publication/e1455e7d-9d66-4553-a9b8-a0a582973cc2

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Anna Fontcuberta i Morral, Eleonora Russo, Anna Dalmau Mallorquí, Ignasi Canales Mundet
2013
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e1455e7d-9d66-4553-a9b8-a0a582973cc2

About this result

Related concepts (7)

Second-harmonic generation

Second-harmonic generation (SHG, also called frequency doubling) is a nonlinear optical process in which two photons with the same frequency interact with a nonlinear material, are "combined", and generate a new photon with twice the energy of the initial photons (equivalently, twice the frequency and half the wavelength), that conserves the coherence of the excitation. It is a special case of sum-frequency generation (2 photons), and more generally of harmonic generation.

Nonlinear optics

Nonlinear optics (NLO) is the branch of optics that describes the behaviour of light in nonlinear media, that is, media in which the polarization density P responds non-linearly to the electric field E of the light. The non-linearity is typically observed only at very high light intensities (when the electric field of the light is >108 V/m and thus comparable to the atomic electric field of ~1011 V/m) such as those provided by lasers. Above the Schwinger limit, the vacuum itself is expected to become nonlinear.

High harmonic generation

High harmonic generation (HHG) is a non-linear process during which a target (gas, plasma, solid or liquid sample) is illuminated by an intense laser pulse. Under such conditions, the sample will emit the high harmonics of the generation beam (above the fifth harmonic). Due to the coherent nature of the process, high harmonics generation is a prerequisite of attosecond physics. Perturbative harmonic generation is a process whereby laser light of frequency ω and photon energy ħω can be used to generate new frequencies of light.

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