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arXiv · 1802.00268

Retrieving the Size of Deep-subwavelength Objects via Tunable Optical Spin-Orbit Coupling

Zheng Xi·H. P. Urbach
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Abstract

We propose a scheme to retrieve the size parameters of a nano-particle on a glass substrate at a scale much smaller than the wavelength. This is achieved by illuminating the particle using two plane waves to create rich and non-trivial local polarization distributions, and observing the far-field scattering pattern into the substrate. A simple dipole model which exploits tunneling effect of evanescent field into regions beyond the critical angle, as well as directional scattering due to spin-orbit coupling is developed, to relate the particle's shape, size and position to the far-field scattering with remarkable sensitivity. Our method brings about a far-field super-resolution imaging scheme based on the interaction of vectorial light with nanoparticles.

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Zheng Xi, H. P. Urbach. 2018-02-01. Retrieving the Size of Deep-subwavelength Objects via Tunable Optical Spin-Orbit Coupling. https://doi.org/10.1103/physrevlett.120.253901

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