https://doi.org/10.1051/epjconf/202328705038
Enhanced epsilon-near-zero structures for photonics
1 Center for Photonics Sciences, University of Eastern Finland, 80101 Joensuu, Finland
2 Tampere Institute for Advanced Study, Tampere University, 33100 Tampere, Finland
3 Faculty of Engineering and Natural Sciences, Tampere University, 33720 Tampere, Finland
* Corresponding author: roman.calpe@uef.fi
Published online: 18 October 2023
We present an experimental realization of a novel layered metamaterial we label enhanced epsilon-near-zero (eENZ). The structure is a stack of alternating thin films made of ENZ– and dielectric material and it can be designed for desired refractive/reflective properties by appropriately tuning the film thicknesses. The structure supports thin film resonances, guided modes and Ferrel-Berreman plasmon modes and the performance of the structure shows a large improvement to many currently available bulk ENZ materials. Additionally, we recently demonstrated the possible use of eENZ for coherence switching in lasers [1]. We demonstrate the design, fabrication and characterization of the optical properties of the eENZ stack and compare the measured transmission properties with transfer matrix method (TMM) simulations.
© The Authors, published by EDP Sciences, 2023
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