2026-04-17T04:29:46Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1167982026-01-30T08:07:22Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Botey Cumella, Muriel author Ahmed Waseem, Waqas Waseem author Herrero Simon, Ramon author Staliunas, Kestutis author 2017 Optical Parity-Time (PT-) symmetric systems support unusual properties when the symmetric coupling between internal modes is broken. We propose a new class of quasiperiodic PT-axisymmetric systems which lead to a simultaneous extraordinary field enhancement and localization at the symmetry center. The effect is based on the asymmetric radial coupling of outward to inward propagating waves of the complex structure. We explore such optical potentials in 1D and 2D combining gain/loss and index modulations, which could have actual realizations in nanophotonic structures. As a direct application, we show how to render a broad aperture vertical-cavity surface-emitting lasers (VCSEL) into a bright and narrow beam source. Postprint (published version) Àrees temàtiques de la UPC::Física Nanophotonics PT-symmetry nanophotonics Nanofotònica PT-axisymmetry for extraordinary field confinement