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      Dispersion engineering of infrared epsilon-near-zero modes by strong coupling to optical cavities

      research-article
      Nanophotonics
      De Gruyter
      dispersion engineering, epsilon-near-zero, Fabry–Perot cavity, phase change material, strong coupling

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          Abstract

          Epsilon-near-zero (ENZ) materials have recently emerged as a promising platform for infrared nanophotonics. A significant challenge in the design of ENZ-based optics is to control the dispersion of ENZ modes that otherwise have a flat profile near the ENZ frequency. Strong coupling with an optical cavity is a promising approach to ENZ dispersion engineering, which however has limitations due to the lack of tunability or nanofabrication demands of the cavity employed. Here, we theoretically and numerically show that much of the limitations of previous approaches can be overcome by strongly coupling the ENZ mode to an unpatterned Fabry–Perot cavity. We demonstrate this unprecedented ENZ dispersion control in coupled cavities by designing tunable infrared polarizers that can absorb s and reflect p-polarized components, or vice versa, for almost any oblique angle of incidence, i.e. omnidirectional polarizers. The feasibility of active control is also demonstrated using a phase change material within the cavity, which predicts dynamic switchability of polariton dispersions across multiple resonant levels at mid-infrared wavelengths. These results are expected to advance the current understanding of strongly coupled ENZ interactions and demonstrate their potential in tailoring dispersions for active and passive control of light.

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          Most cited references56

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          Exciton-polariton Bose-Einstein condensation

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            Fano resonances in photonics

            The importance of the Fano resonance concept is recognized across multiple fields of physics. In this Review, Fano resonance is explored in the context of optics, with particular emphasis on dielectric nanostructures and metasurfaces.
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              Phase-change materials for non-volatile photonic applications

              Materials whose optical properties can be reconfigured are crucial for photonic applications such as optical memories. Phase-change materials offer such utility and here recent progress is reviewed.
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                Author and article information

                Contributors
                Journal
                Nanophotonics
                Nanophotonics
                nanoph
                nanoph
                Nanophotonics
                De Gruyter
                2192-8606
                2192-8614
                21 June 2023
                August 2023
                : 12
                : 16
                : 3301-3312
                Affiliations
                deptDepartment of Chemical Sciences , universityIndian Institute of Science Education and Research , Mohali, 140306, India
                Author notes
                Corresponding author: Ben Johns, deptDepartment of Chemical Sciences , universityIndian Institute of Science Education and Research , Mohali, 140306, India, E-mail: benjohns@ 123456iisermohali.ac.in .
                Author information
                https://orcid.org/0000-0002-6752-5931
                Article
                nanoph-2023-0215
                10.1515/nanoph-2023-0215
                11501747
                39634149
                e0f5fcee-e0fd-4a8f-abf3-8b1069549135
                © 2023 the author(s), published by De Gruyter, Berlin/Boston

                This work is licensed under the Creative Commons Attribution 4.0 International License.

                History
                : 02 April 2023
                : 08 June 2023
                Page count
                Figures: 6, Tables: 1, References: 56, Pages: 12
                Categories
                Research Article

                dispersion engineering,epsilon-near-zero,fabry–perot cavity,phase change material,strong coupling

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