This technique contrasts bulk third-order nonlinearity with surface second-order nonlinearity in gold, suggesting new insights into nanophotonic applications.
We introduce a technique to directly compare the nonlinear properties of gold in a nanophotonic platform, contrasting the third-order nonlinearity arising from the bulk with the second-order nonlinearity resulting from surface asymmetry.
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Iluz et al. (2025) studied this question.
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