Axisymmetric photonic structures with PT-symmetry

Waqas W. Ahmed; Ramon Herrero; Muriel Botey; Kestutis Staliunas

doi:10.1117/12.2239122

16 September 2016 Axisymmetric photonic structures with PT-symmetry

Waqas W. Ahmed, Ramon Herrero, Muriel Botey, Kestutis Staliunas

Proceedings Volume 9920, Active Photonic Materials VIII; 99201U (2016) https://doi.org/10.1117/12.2239122
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

PT-symmetric structures in photonic crystals, combining refractive index and gain-loss modulations is becoming a research field with increasing interest due to the light directionality induced by these particular potentials. Here, we consider PT-symmetric potentials with axial symmetry to direct light to the crystal central point obtaining a localization effect. The axial and PT-symmetric potential intrinsically generates an exceptional central point in the photonic crystal by the merge of both symmetries. This particular point in the crystal lattice causes field amplitude gradients with exponential slopes around the crystal center. The field localization strongly depends on the phase of the central point and on the complex amplitude of the PT-potential. The presented work analyzes in a first stage 1D linear PT-axisymmetric crystals and the role of the central point phase that determines the defect character, i.e. refractive index defect, gain-loss defect or a combination of both. The interplay of the directional light effect induced by the PT-symmetry and the light localization around the central point through the axial symmetry enhances localization and allows higher field concentration for certain phases. The linearity of the studied crystals introduces an exponential growth of the field that mainly depends on the complex amplitude of the potential. The work is completed by the analysis of 2D PT-axisymmetric potentials showing different spatial slopes and growth rates caused by symmetry reasons.

Conference Presentation

Citation Download Citation

Waqas W. Ahmed, Ramon Herrero, Muriel Botey, and Kestutis Staliunas "Axisymmetric photonic structures with PT-symmetry", Proc. SPIE 9920, Active Photonic Materials VIII, 99201U (16 September 2016); https://doi.org/10.1117/12.2239122

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