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.
Cirrus clouds play an important role in atmospheric radiation. Cirrus clouds are mainly composed of tiny ice crystals. Due to the development of industrialization, the ice crystal particles in cirrus may contain some pollutants. Therefore, it is of great significance to study the scattering properties of nucleated ice crystal particles. The research method of this paper is to use Python to write a model file of nucleated long hexagonal prism and flat regular hexagonal ice crystal particles. DDSCAT, an open source software package developed based on DDA, was used to read the model file and calculate the variation of extinction, scattering and absorption efficiency factors with wavelength and effective radius of the two models illuminated by a plane wave. The results show that Qext, Qabs and Qsca are sensitive to the number of ammonium sulfate nuclei and the shape of ice crystals. The results of this paper are expected to provide theoretical support for the study of cirrus scattering characteristics.
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