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Characterizing the non-paraxial Talbot effect of two-dimensional periodic arrays of plasmonic gold nanodisks by differential interference contrast microscopy

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Abstract

Exploiting the working principle of conventional differential interference contrast (DIC) microscopy, we experimentally investigate the non-paraxial Talbot effect of two-dimensional periodic arrays of gold nanodisks (AuNDs) with a periodicity ao comparable to the excitation wavelength λ. In the non-paraxial regime, strongly contrasting self-image patterns at the Talbot and fractional Talbot distances appeared perpendicularly to the AuND array. The experimental self-image distances were comparable to the calculated non-paraxial Talbot distances at two excitation wavelengths (540 nm and 600 nm). Beyond the paraxial limit, Talbot distances were observed at positions smaller than the paraxial Talbot distance.

Graphical abstract: Characterizing the non-paraxial Talbot effect of two-dimensional periodic arrays of plasmonic gold nanodisks by differential interference contrast microscopy

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Article information


Submitted
03 Aug 2020
Accepted
07 Sep 2020
First published
07 Sep 2020

Analyst, 2020, Advance Article
Article type
Communication

Characterizing the non-paraxial Talbot effect of two-dimensional periodic arrays of plasmonic gold nanodisks by differential interference contrast microscopy

G. W. Kim, S. H. Kang and J. W. Ha, Analyst, 2020, Advance Article , DOI: 10.1039/D0AN01544J

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