Abstract
The study of accelerating Airy-family beams has made significant progress, not only in terms of numerical and experimental investigations, but also in conjunction with many potential applications. However, the curvature of such beams (and hence their acceleration) is usually greater than the wavelength. Relatively recently, a new type of localized wave beams with subwavelength curvature, called photonic hooks, was discovered. This paper briefly reviews the substantial literature concerning photonic jet and photonic hook phenomena, based on the photonic jet principle. Meanwhile, the photonic jet ensemble can be produced by optical wave diffraction at 2D phase diffraction gratings. The guidelines of jets’ efficient manipulation, through the variation of both the shape and spatial period of diffraction grating rulings, are considered. Amazingly, the mesoscale dielectric Janus particle, with broken shape or refractive index symmetry, is used to generate the curved photonic jet—a photonic hook—emerging from its shadow-side surface. Using the photonic hook, the resolution of optical scanning systems can be improved to develop optomechanical tweezers for moving nanoparticles, cells, bacteria and viruses along curved paths and around transparent obstacles. These unique properties of photonic jets and hooks combine to afford important applications for low-loss waveguiding, subdiffraction-resolution nanopatterning and nanolithography.
Highlights
Nowadays, bending light beams are being intensively investigated for propagation in free space.The most well-known is the Airy beam, which was first predicted by Berry and Balazs in 1979 [1]and experimentally demonstrated by Siviloglou et al in 2007 [2]
A common optical scheme for Airy beam formation includes a cylindrical lens and a spatial light modulator (SLM), which operates only at restricted power. The latter is mounted in the front focal plane of the cylindrical lens, while the Airy beam generates in its back focal plane and nearby
The results and discussions in this paper include the initial identification of the photonic jet and hook for dielectric microparticles, subwavelength curved localized light beams, photonic jet array by diffraction grating, experimental observations, and the potential applications
Summary
Nowadays, bending light beams are being intensively investigated for propagation in free space. A common optical scheme for Airy beam formation includes a cylindrical lens and a spatial light modulator (SLM), which operates only at restricted power. The latter is mounted in the front focal plane of the cylindrical lens, while the Airy beam generates in its back focal plane and nearby. Scaling the Airy beam generation from visible light to the terahertz range is not always possible This is because SLMs cannot operate in the terahertz range, due to the absence of materials with the required modulation [26]. The results and discussions in this paper include the initial identification of the photonic jet and hook for dielectric microparticles, subwavelength curved localized light beams, photonic jet array by diffraction grating, experimental observations, and the potential applications
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