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“Rainbow” trapped in a self-similar coaxial optical waveguide
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) The schematic SDW (left) and its cross section (right). In the SDW, a hollow core (refractive index ) is surrounded by a coaxial Thue–Morse multilayer consisting of two building blocks (yellow layer) and (blue layer). The refractive-index distributions in the SDWs with different generations: (b) and (c) , respectively.

Image of FIG. 2.
FIG. 2.

The calculated photonic band structures of the SDW, which contains the cladding Thue–Morse dielectric multilayer with different generations : (a) ; (b) ; (c) ; and (d) , respectively. Note that the PBGs are for both TE and TM polarizations. (e) The central frequency distribution of the PBGs in the SDW with different Thue–Morse generations.

Image of FIG. 3.
FIG. 3.

(a) The transmission modes in SDW with the generation . The modes are plotted in circles: the red is for , the brown is for , the blue is for , and the green is for . The black solid line is for incident light. (b) The reciprocal of the attenuation as a function of frequency for the modes: (top), (middle), and (down), respectively. Here the characterized size of the SDW is , thereafter, the SDW works at optical frequency.

Image of FIG. 4.
FIG. 4.

The electric-field time-average energy density distributions in the SDW with the generation for different modes: (a)–(c) modes, (d)–(e) modes, and (f) modes, respectively. Here the characterized size of the SDW is .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: “Rainbow” trapped in a self-similar coaxial optical waveguide