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During the last 2 years, it was shown that an electromagnetic beamconfiguration can be bent after propagation through an asymmetrically shaped(Janus) dielectric particle, which adds a new degree of simplicity forgeneration of a curved light beam. This effect is termed "photonic hook" (PH)and differs from Airy-family beams. PH features the smallest curvature radiusof electromagnetic waves ever reported which is about 2 times smaller than thewavelength of the electromagnetic wave. The nature of a photonic hook is a thedispersion of the phase velocity of the waves inside a trapezoid or composedparticle, resulting in an interference afterwards.

Photonic hook -- a new type of subwavelength self-bending structured light beams: a tutorial review