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 are in good agreement with numerical analysis and show good perspectives of all-dielectric tunable near-infrared nanophotonics.

Near-infrared modulation by means of GeTe/SOI-based metamaterial / Petronijevic, E.; Leahu, G.; Meo, V. D. I.; Crescitelli, A.; Dardano, P.; Coppola, G.; Esposito, E.; Rendina, I.; Miritello, M.; Grimaldi, M. G.; Torrisi, V.; Compagnini, G.; Sibilia, C.. - In: OPTICS LETTERS. - ISSN 0146-9592. - 44:6(2019), pp. 1508-1511. [10.1364/OL.44.001508]

Near-infrared modulation by means of GeTe/SOI-based metamaterial

Petronijevic E.
Primo
Conceptualization
;
Leahu G.
Investigation
;
Sibilia C.
Ultimo
Project Administration
2019

Abstract

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 are in good agreement with numerical analysis and show good perspectives of all-dielectric tunable near-infrared nanophotonics.
metamaterials, phase change materials
01 Pubblicazione su rivista::01a Articolo in rivista
Near-infrared modulation by means of GeTe/SOI-based metamaterial / Petronijevic, E.; Leahu, G.; Meo, V. D. I.; Crescitelli, A.; Dardano, P.; Coppola, G.; Esposito, E.; Rendina, I.; Miritello, M.; Grimaldi, M. G.; Torrisi, V.; Compagnini, G.; Sibilia, C.. - In: OPTICS LETTERS. - ISSN 0146-9592. - 44:6(2019), pp. 1508-1511. [10.1364/OL.44.001508]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1286778
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