Phase-retrieval Fourier microscopy of partially temporally coherent nanoantenna radiation patterns

We report an experimental technique for determining phase-resolved radiation patterns of single nanoantennas by phase-retrieval defocused imaging. A key property of nanoantennas is their ability to imprint spatial coherence, for instance, on fluorescent sources. Yet, measuring emitted wavefronts in...

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Bibliographic Details
Published in:Optics express 2020-12, Vol.28 (25), p.37844-37859
Main Authors: Schilder, Nick J, Wolterink, Tom A W, Mennes, Christiaan, Röhrich, Ruslan, Femius Koenderink, A
Format: Article
Language:English
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Summary:We report an experimental technique for determining phase-resolved radiation patterns of single nanoantennas by phase-retrieval defocused imaging. A key property of nanoantennas is their ability to imprint spatial coherence, for instance, on fluorescent sources. Yet, measuring emitted wavefronts in absence of a reference field is difficult. We realize a defocused back focal plane microscope to measure phase even for partially temporally coherent light and benchmark the method using plasmonic bullseye antenna scattering. We outline the limitations of defocused imaging which are set by spectral bandwidth and antenna mode structure. This work is a first step to resolve wavefronts from fluorescence controlled by nanoantennas.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.410344