Dynamic Nonlocal Dielectric Metasurfaces: Tuning Collective Lattice Resonances via Substrate–Superstrate Permittivity Contrast

Author:

Allayarov Izzatjon123,Evlyukhin Andrey B.34,Roth Diane J.5,Chichkov Boris34,Zayats Anatoly V.5,Calà Lesina Antonio123ORCID

Affiliation:

1. Hannover Centre for Optical Technologies Leibniz University Hannover Nienburger Str. 17 30167 Hannover Germany

2. Institute of Transport and Automation Technology Leibniz University Hannover An der Universität 2 30823 Garbsen Germany

3. Cluster of Excellence PhoenixD Leibniz University Hannover Welfengarten 1A 30167 Hannover Germany

4. Institute of Quantum Optics Leibniz University Hannover Welfengarten 1 30167 Hannover Germany

5. Department of Physics and London Centre for Nanotechnology King's College London Strand London WC2R 2LS UK

Abstract

Contrary to local resonances of single nanostructures, collective (or nonlocal) resonances in periodic metasurfaces, such as surface lattice resonances (SLRs), can significantly enhance light–matter interaction, leading to higher spectral selectivity. The dynamic control of such nonlocal response represents an emerging field of research. While tuning of SLRs has been demonstrated in plasmonic metasurfaces, the use of dielectric metasurfaces provides additional conditions to control both reflectance and transmittance, with minimum absorption effects. A close‐to‐homogeneous environment is usually required to guarantee the excitation of SLRs. Here, we propose theoretically and demonstrate experimentally a practical strategy for the tuning of SLRs in dielectric metasurfaces when an arbitrary index mismatch is considered between substrate and superstrate. The approach is based on a generalized lattice sum theory that accounts for the presence of a substrate. Dynamic tuning of the SLRs in silicon metasurfaces placed on a substrate is achieved with a changeable superstrate via an optofluidic process. Two tuning mechanisms are revealed corresponding to shifting and damping of the SLR, depending on the superstrate–substrate refractive index contrast. The demonstrated dynamic manipulation of transmission and reflection may be exploited in dielectric metasurfaces for tunable spectral selectivity, sensing, or novel display technologies.

Funder

Deutsche Forschungsgemeinschaft

Alexander von Humboldt-Stiftung

European Research Council

Engineering and Physical Sciences Research Council

Publisher

Wiley

Subject

Pharmacology (medical),Complementary and alternative medicine,Pharmaceutical Science

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