Twist-induced guidance in coreless photonic crystal fiber: A helical channel for light.
Sci Adv
; 2(11): e1601421, 2016 Nov.
Article
em En
| MEDLINE
| ID: mdl-28138531
ABSTRACT
A century ago, Einstein proposed that gravitational forces were the result of the curvature of space-time and predicted that light rays would deflect when passing a massive celestial object. We report that twisting the periodically structured "space" within a coreless photonic crystal fiber creates a helical channel where guided modes can form despite the absence of any discernible core structure. Using a Hamiltonian optics analysis, we show that the light rays follow closed spiral or oscillatory paths within the helical channel, in close analogy with the geodesics of motion in a two-dimensional gravitational field. The mode diameter shrinks, and its refractive index rises, as the twist rate increases. The birefringence, orbital angular momentum, and dispersion of these unusual modes are explored.
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Base de dados:
MEDLINE
Tipo de estudo:
Guideline
Idioma:
En
Revista:
Sci Adv
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Alemanha