Abstract
Bending light in a controllable way is desired in various applications such as beam steering, navigating and cloaking. Different from the conventional way to bend light by refractive index gradient, transformation optics or special beams through wavefront design such as Airy beams and surface plasmons, we proposed a mechanism to bend light via resonant adiabatic optical transition between Floquet-Bloch (FB) modes from different FB bands in longitudinally modulated photonic lattices. The band structure of longitudinally modulated photonic lattices was calculated by employing the concept of quasi-energy based on the Floquet-Bloch theory, showing the existence of band discontinuities at specific resonant points which cannot be revealed by the coupled-mode theory. Interestingly, different FB bands can be seamlessly connected at these resonant points in longitudinally modulated photonic lattices driven by adiabatically varying the longitudinal modulation period along the propagation direction, which stimulates the adiabatic FB mode transition between different FB bands.
Highlights
Atomic or molecular systems driven by a temporally periodic field, especially by an intensive laser field, leading to the discovery of many novel atom-field interaction phenomena that cannot be explained by the general perturbation theory[26,37,38,39]
Band discontinuity and adiabatic optical transition between different FB modes are predicted at specific resonant points, which can be used to manipulate the flow of light in photonic lattices with controllable bending light trajectory
Bending the light propagation trajectory in a designable way is desired in many practical applications such as beam steering and switching, beam navigation and even cloaking, and it may be achieved by designing the refractive index gradient along the light propagation trajectory[47] or through transformation optics[48,49] or by employing special beams with special wavefront structure such as Airy beams[50,51,52] or Airy plasmons[53,54,55,56,57,58]
Summary
Atomic or molecular systems driven by a temporally periodic field, especially by an intensive laser field, leading to the discovery of many novel atom-field interaction phenomena that cannot be explained by the general perturbation theory[26,37,38,39]. Band discontinuity and adiabatic optical transition between different FB modes are predicted at specific resonant points, which can be used to manipulate the flow of light in photonic lattices with controllable bending light trajectory
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