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Superprism effect in all-glass volumetric photonic crystals

Filipkowski A., Buczyński R., Waddie A. J., Kujawa I., Pysz D., Taghizadeh M. R., Stępień R.

Opto-Electronics Review

2012

Vol. 20, No. 3

267-274

This paper focuses on the superprism effect which can be obtained in low-contrast photonic crystals. The modelling is related to the newly developed method for all-dielectric photonic crystals. This places material constraints on the simulated crystals which limit the refractive index difference to 0.1 for all-glass photonic crystals and 0.6 for air-glass structures and forces us to focus on hexagonal lattices. The simulations show the existence of superprism effect in both types of structure for realistic glasses. In both cases various linear filling factors are studied in order to maximize the frequency range of the superprism effect. For the air-F2 glass structure it reaches 0.108 normalized frequencies and for the air-NC21 glass structure it reaches 0.99 normalized frequencies for TM polarization. For the double glass structures, the largest range is for the F2/NC21 photonic crystal and spans 0.012 normalized frequencies. In the F2/NC21 crystal the frequency range reaches 0.005 for TE polarization.

A novel structure for 4-channel all optical demultiplexer using 12-fold photonic quasicrystal

Pishvai Bazargani H.

Optica Applicata

2011

Vol. 41, nr 3

661--668

In this work, a new structure for a 4-channel all optical demultiplexer has been designed, using a 12-fold photonic quasicrystal (PQC). The structure used in this research is composed of air rods of 150 nm in diameter, arranged on silicon nitride substrate with a pitch of 260 nm and lattice constant of 0.25. The area of the structure is only 16 ?m2 which is quite interesting for optical integrated circuit applications. The four channels are separated by introducing some defects to the crystal. Also, superprism effect in PQCs has been investigated by changing the tiling angle of input Gaussian modulated wave. Finally, four channels with spacing of 7.8 nm between channels one and two, 3.6 nm between channels two and three and 7.3 nm between channels three and four, around 0.6 ?m as the central wavelength have been separated. The crosstalk level between adjacent channels is about -8 dB for channels one and two, -3 dB for channels two and three and -6.5 dB for channels three and four.