Nonlinear microscopy using cylindrical vector beams: Applications to three-dimensional imaging of nanostructures

The three-dimensional (3D) optical fields that arise from the focusing of cylindrical vector beams (CVB) with radial and azimuthal polarizations provide new sources of contrast for optical microscopy of nano-objects. So far, these demonstrations have been restricted to two-dimensional transversal scanning, i.e., along the focal plane of interest, or use of point-like objects, i.e., single molecules and nanoparticles. Here, we demonstrate the first application of CVBs for 3D imaging of 3D nano-objects. This technique is done by acquiring 3D image scans of the second-harmonic generation signal from vertically-aligned semiconductor nanowires, whose second-order response is primarily driven by the longitudinal electric field, i.e., the field component along the nanowire axis. Our technique provides a new way to study individual nano-objects in three dimensions through the unique combination of nonlinear microscopy and CVBs.

DOI

10.1364/OE.25.012463

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Bautista, G, Kakko, J P, Dhaka, V, Zang, X, Karvonen, L, Jiang, H, Kauppinen, E, Lipsanen, H & Kauranen, M 2017, ' Nonlinear microscopy using cylindrical vector beams : Applications to three-dimensional imaging of nanostructures ', Optics Express, vol. 25, no. 11, pp. 12463-12468 . https://doi.org/10.1364/OE.25.012463

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https://urn.fi/URN:NBN:fi:aalto-201808014371

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[article-cris] Perustieteiden korkeakoulu / SCI

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Nonlinear microscopy using cylindrical vector beams: Applications to three-dimensional imaging of nanostructures

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