Non-negligible magnetic dipole scattering from metallic nanowire for ultrasensitive deflection sensing

Abstract

It is generally believed that when a single metallic nanowire is sufficiently small, it scatters like a point electric dipole. We show theoretically when a metallic nanowire is placed inside specially designed beams, the non-negligible magnetic dipole contribution along with the electric dipole resonance can lead to unidirectional scattering in the far-field, fulfilling Kerker's condition. Remarkably, this far-field unidirectional scattering encodes information that is highly dependent on the nanowire's deflection at a scale much smaller than the wavelength. The special role of small but non-negligible magnetic response and plasmonic resonance are highlighted for this extreme sensitivity as compared with the dielectric counterpart. Effects such as scattering efficiency and shape of the nanowire's cross section are also discussed.

5 pages, 3 figures. Comments are welcome

References in corpus (4)

• Magneto-optical trapping of a diatomic molecule
• All-Dielectric Rod-Type Metamaterials at Optical Frequencies
• Mapping and Quantifying Electric and Magnetic Dipole Luminescence at the nanoscale
• Plasmon scattering from single sub-wavelength holes

Cited by in corpus (6)

• Generalized Kerker Effects in Nanophotonics and Meta-Optics
• Transverse Kerker Scattering for Angstrom Localization of Nanoparticles
• Interferometric evanescent wave excitation of nano-antenna for ultra-sensitive displacement and phase metrology
• Retrieving the Size of Deep-subwavelength Objects via Tunable Optical Spin-Orbit Coupling
• Broadband Control on Scattering Events with Interferometric Coherent Waves
• Linear control of light scattering with multiple coherent light excitation