Abstract
During last 2 years it was shown that an electromagnetic field can be made to curve after propagation through a simple dielectric material of special shape, which adds a new-found degree of simplicity. This effect was termed ‘photonic hooks’ – it is an unique electromagnetic beam configuration behind a mesoscale dielectric 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 a new dielectric particle-based strategy to design self-bending subwavelength structured light beams.
Highlights
The word “optics” is derived from the ancient Greek philosophers term meaning "appearance, look" and was based on the idea that light propagates along straight lines expanding as they travel
In [9, 12] we theoretically studied a photonic nanojet” (PJ) formed behind the symmetric particle with an equal rib and discussed some examples of photonic hook” (PH) behind the mesoscale particles with broken symmetry
We have propose to extend the idea of the dielectric particle with broken symmetry to control the wave fronts of surface wave
Summary
The word “optics” is derived from the ancient Greek philosophers term meaning "appearance, look" and was based on the idea that light propagates along straight lines expanding as they travel. It is important to note that for finite power Airy beams, while the local intensity features do self-bend in a self-similar fashion, the Ehrenfest theorem still holds preserving the balance of the transverse electromagnetic momentum Ever since, this class of accelerating or self-bending beams has attracted considerable attention and found applications in many and diverse fields, especially in the paraxial domain. In the past few years, other types of Airy-like accelerating curved beams have been intensely explored; among them: “half Bessel” [5], Weber (travel along parabolic) and Mathieu (travel along elliptic curves) beams [6, 7] These beams are by nature non-paraxial and can bend at larger angles.
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