In the past few years, it has shown that photonic jet – a high-intensity near-field focus can be curved through focusing of an asymmetric mesoscale dielectric particle. This unique electromagnetic beam configuration breaking spatial symmetry was termed ‘photonic hooks’ and demonstrated different features from Airy-family beams using a relatively simple experimental setup. The measured radius of the photonic curvature it creates approximates to half of the wavelength, which is the smallest curvature of electromagnetic wave ever reported. This effect was discovered in many relevant fields, including near-field optics (both in transmitted and reflection modes), terahertz (THz) radiation, in-plane plasmonics, and acoustics, and this paper is a short review for them.
During last several years it was shown, that an electromagnetic field can be made to curve after propagation through a simple dielectric mesoscale Janus particle of special shape, which adds a newfound degree of simplicity. This effect was discovered by I.V.Minin and O.V.Minin and termed ‘photonic hooks’– it is an unique electromagnetic self-bending subwavelength structured light beams configuration behind a mesoscale particle with a broken symmetry and differ from Airy-family beams. PH features the radius of curvature, which is about 2 times smaller than the electromagnetic wavelength - this is the smallest curvature radius of electromagnetic waves ever reported. The nature of a photonic hook is in dispersion of the phase velocity of the waves inside of particle, resulting in interference. Here, we report an experimental verification of the photonic hook effect in terahertz waveband.
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