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Abstract
Deep subwavelength localization and displacement sensing of optical nanoantennas have emerged as extensively pursued objectives in nanometrology, where focused beams serve as high-precision optical...
Highlights
Deep subwavelength localization and displacement sensing of optical nanoantennas have emerged as extensively pursued objectives in nanometrology, where focused beams serve as high-precision optical rulers while the scattered light provides an optical readout
The latter implies that the far-field sensitivity to displacements of a nanoantenna may be enhanced by tailoring the spatial derivatives of the excitation field
A polarization-tailored beam is focused by a microscope objective (MO1) with the numerical aperture NA1 onto a nanoantenna positioned in the focal plane
Summary
We have considered a subwavelength localization and displacement sensing scheme that is based on the positiondependent scattering response of optical nanoantennas excited with structured light beams. We would like to note a similarity between our approach to enhance the displacement sensitivity and the quantum weak measurements inspired[48,49] polarization filtering techniques, typically employed to enhance the visibility of beam shift phenomena.[50−53] In the context of classical optics, a “weak measurement” with pre- and postselected state vectors consists of performing a measurement in which polarization weakly couples to other degrees of freedom using two almost orthogonal input and output polarizations states.[54−58] Only recently have these techniques expanded to the realm of nanooptics and nanophotonics,[23,24,59] for which an analogy was put forward.[24] in our case, a superposition of azimuthal polarization with a small fraction of radial polarization and the selective response of the electric-dipole nanoantenna to the focal electric field created mostly by the radial component near the optical axis can be regarded as pre- and postselection, respectively.
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