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Type: 
Journal
Description: 
Today, nanophotonics still lacks components for modulation that can be easily implementable in existing silicon-on-insulator (SOI) technology. Chalcogenide phase change materials (PCMs) are promising candidates for tuning in the near infrared: at the nanoscale, thin layers can provide enough contrast to control the optical response of a nanostructure. Moreover, all-dielectric metamaterials allow for resonant behavior without having ohmic losses in the telecom range. Here, a novel hybridization of a SOI-based metamaterial with PCM GeTe is experimentally investigated. A metamaterial based on Si nanorods, covered by a thin layer of GeTe, is designed and fabricated. Switching GeTe from amorphous to crystalline leads to a rather high resonance-governed reflection contrast at 1.55 μm. Additional confocal Raman imaging is done to differentiate the crystallized zones of the metamaterials’ unit cell. The findings …
Publisher: 
Optical Society of America
Publication date: 
15 Mar 2019
Authors: 

E Petronijevic, G Leahu, V Di Meo, A Crescitelli, P Dardano, G Coppola, E Esposito, I Rendina, M Miritello, MG Grimaldi, V Torrisi, G Compagnini, C Sibilia

Biblio References: 
Volume: 44 Issue: 6 Pages: 1508-1511
Origin: 
Optics Letters