Fig. 1


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Simulated perfect twist-symmetric structures with pin-type deformations. Studied structures: (a) purely periodic, (b) 2-fold, (c) 3-fold, and (d) 4-fold. (e) Dispersion diagram using the dimensions: h p  = 1.2 mm, w p  = 1 mm, r i  = 1 mm, r o  = 2.5 mm, and p = 10 mm; (f) Effective refractive index comparison of the purely periodic and 4-fold twist-symmetric structures with dimensions: h p  = 1.2 mm (tuned: h p  = 1.075 mm), w p  = 1 mm, r i   =  1 mm, r o  = 2.5 mm, and p = 6 mm.

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