Publication

Far-Field Patterns of Second-Harmonic Generation in Plasmonic Nanostructures: Differentiating Surface and Bulk Contributions

2025

Abstract

Distinguishing between surface and bulk second-harmonic generation (SHG) remains a challenge in nonlinear plasmonics. We demonstrate that far-field SHG patterns can provide valuable insights into the nature of these contributions, offering a way to differentiate them. This study presents a comparative analysis of SHG far-field responses from plasmonic nanostructures with varying radii.

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2025

Abstract

Official source

Related concepts (26)

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.

Plasmonic metamaterial

A plasmonic metamaterial is a metamaterial that uses surface plasmons to achieve optical properties not seen in nature. Plasmons are produced from the interaction of light with metal-dielectric materials. Under specific conditions, the incident light couples with the surface plasmons to create self-sustaining, propagating electromagnetic waves known as surface plasmon polaritons (SPPs). Once launched, the SPPs ripple along the metal-dielectric interface. Compared with the incident light, the SPPs can be much shorter in wavelength.

Plasmon

In physics, a plasmon is a quantum of plasma oscillation. Just as light (an optical oscillation) consists of photons, the plasma oscillation consists of plasmons. The plasmon can be considered as a quasiparticle since it arises from the quantization of plasma oscillations, just like phonons are quantizations of mechanical vibrations. Thus, plasmons are collective (a discrete number) oscillations of the free electron gas density. For example, at optical frequencies, plasmons can couple with a photon to create another quasiparticle called a plasmon polariton.

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Far-Field Patterns of Second-Harmonic Generation in Plasmonic Nanostructures: Differentiating Surface and Bulk Contributions

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