The red blood cells, the role of which is difficult to underestimate in life and biology, were usually chosen as a sample for observation in an optical microscope. In this paper, we show that using optical microscopy based on high-index spherical mesoscale particles with a refractive index of 1.9, generating a non-evanescent curved light beam with subwavelength structures – so-called a structure light photonic hook by partial illumination conditions, it is possible to study the transformation dynamics of an erythrocyte into an echinocyte. Examples of images are presented. The findings in this manuscript have promising application prospects in nanomanipulation, biology, and medicine.
The resonance scattering caused by the interaction between a dielectric cylinder rotating at a steady angular velocity and a plane wave are studied using the method of separation of variables and the multipole expansion method. In addition, the effect of resonance on curved photonic nanojets (PNJ) is also analyzed. During the study, the critical value of resonance scattering is found by changing the dimensionless and dimensional parameters of the medium cylinder. It is found that the rotation of particles can create and destroy resonance phenomena. The resonance scattering of rotating dielectric cylinders produced by plane waves provides a new direction for the study of PNJ and whispering gallery mode (WGM), as well as the design and application of ultra-sensitive sensors and resonators
Based on the optical Magnus effect, the theoretical framework that scattering generated by a plane wave illuminating a spinning dielectric sphere is proposed using the “instantaneous rest-frame” hypothesis and Minkowski's theory. The analytic expressions of electromagnetic fields are derived for a dielectric sphere rotating around the z-axis exerted by a plane wave illuminating in an arbitrary direction using the method of separation of variables. Both the photonic hook (PH) and the resonance scattering generated by the spinning dielectric sphere are concerned and investigated. The impact of resonance scattering generated by the rotation on the PH is also discussed. The influence of the non-reciprocal rotating dimensionless parameter which determines the existence of PH and resonance to the scattering is emphasized. All the findings in this manuscript have extensive application prospects in particle manipulation, designing of the resonator, and mesotronics.
This paper studies the photonic hooks (PH) generated by the interaction of a dielectric sphere rotating at a certain angular velocity with a plane wave. Based on the instantaneous static frame theory and the partial-wave series expansion method in spherical coordinates, with the help of the separated variable method, we obtain the analytical solutions for the internal and external electric fields of a homogeneous isotropic dielectric sphere rotating around the z-axis irradiated by a plane wave of arbitrary direction. This article focuses on the effect of size parameters (ka), relative refractive index (m1), and rotational dimensionless parameters 𝛾 on PH. The PH produced by this non-reciprocal system can be used not only for trapping off-axis particles, but also has promising applications in low-loss waveguiding, subdiffraction-resolution nanopatterning, and nanolithography.
KEYWORDS: Light sources and illumination, Particles, Nanoparticles, Near field optics, Dielectrics, Water, Refractive index, Plasmonics, Near field, Spherical lenses
Tunable photonics is a booming field, allow to revolutionizing basic research of mesotronics. Recently we demonstrate innovative proof-of-concept of the time domain self-bending photonic hook (TD–PH) structured beams. Such near-field nonevanescent beam was generate by natural phase-change material as a mesoscale freezing water microdroplet. Such TD-PHs open applications in many fields, including microscopy, sensors, optical switching, temporal optics, optomechanical tweezers, materials processing, biomedicine, and so on. Moreover, new ways to generate photonic hooks have recently been proposed, such as: dual dielectric structure, double photonic hooks under both continuum wave and pulsed illumination. A new quality-criterion of the photonic hook beams was proposed.
The history of classical optics is associated with dielectric lenses, with a Mie size parameter, q=2πR/λ (where R is the radius sphere, and λ is the radiation wavelength) of about q>100, where the geometrical optics approximation is valid. The optically resonant dielectric nanostructures with a high refractive index has the size parameter of the one, q~1. But the dielectric particles with q ~ 10, are in the region between the wave and geometric optics turned out to be a "black spot" on the map of dielectric photonics. However, the studies on the optics of dielectric spheres of mesoscale sizes over the past twenty years, discover a number of unusual phenomena, including optical vortices, single and double both photonic nanojets and photonic hook, high-order Fano resonances, and the excitation of giant magnetic fields. The report gives a brief overview of these phenomena. The presence of a number of interesting applications indicates a new promising direction in photonics called mesotronics.
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