2026-04-14T06:43:59Zhttps://recercat.cat/oai/request

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

PT-axisymmetry for extraordinary field confinement Botey Cumella, Muriel Ahmed Waseem, Waqas Waseem Herrero Simon, Ramon Staliunas, Kestutis Universitat Politècnica de Catalunya. Departament de Física Universitat Politècnica de Catalunya. DONLL - Dinàmica no Lineal, Òptica no Lineal i Làsers Àrees temàtiques de la UPC::Física Nanophotonics PT-symmetry nanophotonics Nanofotònica 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) 2017 Conference report Botey, M., Ahmed, W., Herrero, R., Staliunas, K. PT-axisymmetry for extraordinary field confinement. A: SPIE Photonics West OPTO Conference. "Proceedings Volume 10112, Photonic and Phononic Properties of Engineered Nanostructures VII". Washington: International Society for Photo-Optical Instrumentation Engineers (SPIE), 2017, p. 1-4. 9781510606654 https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10112/101121P/PT-axisymmetry-for-extraordinary-field-confinement/10.1117/12.2254247.short https://hdl.handle.net/2117/116798 10.1117/12.2254247 eng www-spiedigitallibrary-org http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain 4 p. application/pdf International Society for Photo-Optical Instrumentation Engineers (SPIE)