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Giant 2D-chiroptical response in an achiral metasurface integrated with black phosphorus.
Opt Express ; 30(5): 8266-8274, 2022 Feb 28.
Article in En | MEDLINE | ID: mdl-35299572
In this work, we proposed a black phosphorus (BP) achiral metasurface and theoretically study the chiroptical response arising from extrinsic 2D-chirality in the mid-infrared regime. The achiral metasurface is composed of a monolayer BP sheet sandwiched by a silver ring array and dielectric spacer stacking on a silver substrate. The giant circular conversion dichroism (CCD) of the achiral metasurface is allowed at oblique incidence for the cooperative interaction of BP anisotropic surface plasmon modes and localized surface plasmons in metal rings, and the integrated BP can dynamically modulate the chiroptical response by controlling the doping concentration of BP. Furthermore, we found that a multiband phenomenon for CCD response occurs when tuning the thickness of the spacer. The proposed hybrid achiral metasurface provides more flexible opportunities to realize active polarization modulator, biosensor and chiral detection.

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Opt Express Journal subject: OFTALMOLOGIA Year: 2022 Document type: Article Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Opt Express Journal subject: OFTALMOLOGIA Year: 2022 Document type: Article Country of publication: United States