Abstract
Stacked metasurfaces are being investigated in light of exploring exotic optical effects that cannot be achieved with single-layered metasurfaces. In this article, we theoretically demonstrate that metallic wire-grid metasurfaces with specific polarization properties have the ability to induce tunable Fano resonances when they are stacked. The developed original model—combining a circulating field approach together with an extended Jones formalism—reveals the underlying principle that gives rise to the polarization-induced Fano resonances. The theoretical frame is validated in an experimental proof of concept using commercially available wire-grids and a terahertz time domain spectrometer. This unexplored possibility opens an alternative path to the realization and control of Fano resonances by using stacked metallic metasurfaces. Furthermore, these findings suggest that the polarization can be used as an additional degree of freedom for the design of optical resonators with enhanced and tunable properties.
Highlights
Stacked metasurfaces are being investigated in light of exploring exotic optical effects that cannot be achieved with single-layered metasurfaces
Metallic metamaterials rised in popularity because of the wide diversity of physical effects which they can exhibit such as extraordinary optical transmission[15], negative refraction[16] or perfect absorption[17]
The period, the thickness and the aperture width of both Metallic Wire-Grid Metasurfaces (MWGMs) are denoted by p, h, and a respectively
Summary
Stacked metasurfaces are being investigated in light of exploring exotic optical effects that cannot be achieved with single-layered metasurfaces. The theoretical frame is validated in an experimental proof of concept using commercially available wire-grids and a terahertz time domain spectrometer This unexplored possibility opens an alternative path to the realization and control of Fano resonances by using stacked metallic metasurfaces. The main focus of the present work is not to report another polarization-dependent metasurface design where the unit cell itself is exciting Fano resonances[25, 26], but rather to demonstrate, theoretically and experimentally, another route for the realization of Fano resonances via stacked metasurfaces This concept is theoretically introduced and further developped thanks to an original cavity model which combines a circulating field approach[27] and an extended Jones formalism[28]. This unusual configuration to excite Fano resonances paves the way toward unconventional designs of tunable and high quality factor devices, which are in great demand in the THz region
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
