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Anisotropic second-harmonic generation from monocrystalline gold flakes.

Sergejs Boroviks, Torgom Yezekyan, Álvaro Rodríguez Echarri

|February 12, 2021

Summary

Monocrystalline gold flakes show unique polarization-dependent second-harmonic generation, unlike polycrystalline films. This confirms second-harmonic microscopy as a tool for analyzing gold crystallographic orientation in nano-optical devices.

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Area of Science:

Nanophotonics
Materials Science
Nonlinear Optics

Background:

Noble metals with defined crystallographic orientation are key for nanoscale light-matter interactions.
Nonlinear optical processes are sensitive to anisotropy and useful for probing crystallinity.

Purpose of the Study:

To investigate the nonlinear optical response of monocrystalline gold flakes.
To explore the use of second-harmonic generation as a probe for crystallographic orientation.

Main Methods:

Studied nonlinear optical response of monocrystalline gold flakes.
Utilized second-harmonic generation microscopy.
Compared results from monocrystalline and polycrystalline gold films.

Main Results:

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Observed distinct polarization dependence in second-harmonic generation from the {111} surface of monocrystalline gold.
Found this polarization dependence to be absent in polycrystalline gold films.

Conclusions:

Second-harmonic microscopy is a robust, non-destructive method for probing gold crystallographic orientation.
Findings provide guidelines for enhancing nonlinear response in plasmonic systems.