Ultrafast low-pump fluence all-optical modulation based on graphene-metal hybrid metasurfaces.

ABSTRACT: Graphene is an attractive material for all-optical modulation because of its ultrafast optical response and broad spectral coverage. However, all-optical graphene modulators reported so far require high pump fluence due to the ultrashort photo-carrier lifetime and limited absorption in graphene. We present modulator designs based on graphene-metal hybrid plasmonic metasurfaces with highly enhanced light-graphene interaction in the nanoscale hot spots at pump and probe (signal) wavelengths. Based on this design concept, we have demonstrated high-speed all-optical modulators at near and mid-infrared wavelengths (1.56 μm and above 6 μm) with significantly reduced pump fluence (1-2 orders of magnitude) and enhanced optical modulation. Ultrafast near-infrared pump-probe measurement results sugg

SUBMITTER: Basiri A 

PROVIDER: S-EPMC9021307 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature