Bending light via adiabatic optical transition in longitudinally modulated photonic lattices.

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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Han B,Xu L,Dou Y,Xu J,Zhang G

doi

10.1038/srep15805

subject

Has Abstract

pub_date

2015-10-29 00:00:00

pages

15805

issn

2045-2322

pii

srep15805

journal_volume

5

pub_type

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