The photonic hook (PH) generated by a partially illuminated high-index dielectric particle hemi-immersed in the dielectric film is investigated. A tunable PH is generated from a cylinder deposited on a dielectric film, and the cylinder is partially illuminated by the placement of a thin, flat aluminum mask in front of it. The effects of film type, mask width, and height of dielectric film are mainly discussed. The results provide a novel design method for PHs, which have potential applications in optical manipulation and high-resolution imaging.
The scattering of polarized plane waves on a rotating spherical particle, especially the far-field characteristics, is studied based on the “instantaneous rest-frame” hypothesis and Minkowski’s theory. The influence of the rotating angular velocity on the scattering is emphasized and is expressed as the dimensionless parameter y. The effects of incident light polarization states and particle size parameter ka are investigated on this basis. Besides, the loss of particles is also introduced. Besides, the influence of material on the scattering characteristic of rotating particles is also a concern, and the particle loss is introduced. Related results have promising applications in the material property research and target detection fields. Furthermore, they can also be extended to planetary research and detection, which plays a vital role in exploring the mysteries of the universe.
The optical spin torque (OST) exerted on a dielectric Rayleigh spherical particle by photonic hook is investigated in the framework of dipole approximation. Optical spin torque is a type of optical torque that causes a particle to rotate around its center of mass. I.V. Minin and O.V.Minin discovered the photonic hook phenomenon in 2015 (Patent of Russia 161207). They used the combined structure of cube and prism to form a curved beam to pull a small particle, which caused a great sensation in the field of photonics. In this paper, the photonic hook is generated by a plane wave illuminating a dielectric irregular cuboid with one corner cut off. The effects of wavelength and slope of cutting of the irregular cuboid on the OST are analyzed. The numerical results show that the wavelength and inclination of cutting greatly affect the OST. Optical spin torques contain a large amount of negative torques and are sensitive to the slope of cutting of the irregular cuboid. The results of this paper are expected to provide theoretical support for the manipulation and rotation of Rayleigh particles in structured wavelength-scaled localized beams.
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