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Genetic optimization Invents non-Hermitian potentials for Asymmetric Reflectivity

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Ahmed Waseem, Waqas Waseem
Herrero Simon, RamonMés informacióMés informacióMés informació
Botey Cumella, MurielMés informacióMés informacióMés informació
Wu, Ying
Staliunas, KestutisMés informacióMés informacióMés informació
Document typeResearch report
Defense date2020-08
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
We propose a general design strategy based on genetic optimization to realize asymmetric reflectivity in periodic and non-periodic planar structures containing dielectric and gain-loss layers. By means of an optimization algorithm, it is possible to design the imaginary (or real) part of the complex permittivity distribution from any given and arbitrary real (or imaginary) permittivity distribution, i.e to create non-Hermitian potentials intended to achieve on-demand light transport for a selected spectral range. Indeed, the asymmetric response of the obtained complex permittivity distribution is directly related to its area in the complex permittivity plane. In particular, unidirectional light reflection can be designed in such a way that it switches from left to right (or vice versa) depending on the operating frequency. Moreover, such controllable unidirectional reflectivity can be realized using a stack of dielectric layers while keeping the refractive index and gain-loss within realistic values.
CitationAhmed, W. [et al.]. Genetic optimization Invents non-Hermitian potentials for Asymmetric Reflectivity. 2020. 
URIhttp://hdl.handle.net/2117/345572
URL other repositoryhttps://arxiv.org/abs/2008.12057
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  • Departament de Física - Reports de recerca [324]
  • DONLL - Dinàmica no lineal, òptica no lineal i làsers - Reports de recerca [9]
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