EIT-like all-dielectric metamaterials with phase changing layers for all-optical switching applications

Publication date: 1 Gen 2017

JournalSource: OPENALEXOpenAlex type: articleClosed Access
Authors: Alessio Crescitelli, Emanuela Esposito, Emilija Petronijevic, G. Leahu, Valentina Di Meo, A. Crescitelli, Principia Dardano, Giuseppe Coppola, E. Esposito, Ivo Rendina, Maria Miritello, Maria Grazia Grimaldi, C. Sibilia

In this work, we propose the hybridization of all-dielectric metasurfaces based on Si nanoresonators with thin layers of phase change materials (PCM). The concept of all-dielectric metasurfaces is important when one needs to avoid inherent ohmic losses in metal-based nanostructures, e.g. for high Qfactor and figure of merit (FOM). Si nanoresonators can possess electric and magnetic resonances while having low losses in the desired range. On the other hand, chalcogenide PCM have at least two phases with different optical properties, stable at room temperature; switching between these two phases can be reversibly done by a visible laser. If a thin PCM layer is put in contact with Si nanoresonator, its phase-change will change the dielectric environment of the nanoresonator, thus changing the overall resonant response. We numerically investigate the all-optical switching in telecom range of the metasurface based on nanorods and square-like nanorings, namely “bright” and “dark” nanoresonators, respectively. We then experimentally report on the PCM switching metasurface based on nanorods, i.e. “bright” resonators. We strongly believe that this research could lead to new perspectives in all-optical, all-dielectric nanophotonics.

Origin
OpenAlex
Pages
14 (4 .)
Cited by
1
Legacy ID
5c5166e1cf530e07f3b76c7880df2752
Biblio references
Pages: 14 (4.)-14 (4.)