Accurate feeding of nano antenna by polarization singularities for lateral and rotational displacement sensing

Abstract

Addressing subwavelength object and displacement is crucial in optical nanometrology. We show in this Letter that nano antennas with subwavelength structures can be addressed precisely by incident beams with singularity. This accurate feeding beyond the diffraction limit can lead to dynamic control of the unidirectional scattering in the far field. The combination of polarization discontinuity of the incoming singular beam, along with the rapid phase variation near the antenna leads to remarkable sensitivity of the far field scattering to displacement at deep subwavelength scale. This opens a far field deep subwavelength postion detection method based on the interaction of singular optics with nano antennas.

References in corpus (5)

• Spin-orbit interactions of light
• Measuring the Transverse Spin Density of Light
• Excitation of radiationless anapole mode of isotropic dielectric nanoparticles with tightly focused radially polarized beam
• Plasmon spectra of nanospheres under a tightly focused beam
• Broadband active tuning of unidirectional scattering from nanoantenna using combined radially and azimuthally polarized beams

Cited by in corpus (9)

• Transverse Kerker Scattering for Angstrom Localization of Nanoparticles
• Spin-Orbit Coupling and the Evolution of Transverse Spin
• Mapping the near-field spin angular momenta in the structured surface plasmon polaritons field
• Interferometric evanescent wave excitation of nano-antenna for ultra-sensitive displacement and phase metrology
• Non-negligible magnetic dipole scattering from metallic nanowire for ultrasensitive deflection sensing
• Adding a spin to Kerker's condition: arbitrary scattering direction tuning of nano-antennas with designed excitation
• Fisher-Information Efficient Metagratings for Transverse Displacement Metrology at the Measurement Independent Shot-Noise Limit
• Retrieving the Size of Deep-subwavelength Objects via Tunable Optical Spin-Orbit Coupling
• Selective Excitation of Subwavelength Atomic Clouds