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We introduce chip-integrated visible light communication-band modulatorsbased on niobium (Nb) metallic plasmonic nano-antenna arrays. Our plasmonicnano-devices provide strong sensitivity to the polarization of the incidentvisible light and the geometrical parameters of their subwavelength nanoscalebuilding blocks. Moreover, they offer optical modulation properties withmodulation depth MD = 60% at resonant wavelength lambda= 716 nm, at roomtemperature. By engineering the photo response of the Nb nano-device arrays, weobserve a maximum extinction A(lambda)= 1- R(lambda}) = 95 % at resonantwavelength {\lambda}= 650 nm. Our results suggest that the integrated Nbnano-antenna array devices can be considered as suitable platforms for therealisation of chip-scale optoelectronic devices interfacing cryogenics quantumcircuits, and fibre-based communication systems, for applications in quantumcomputing, quantum communication, and quantum processing.

On-chip visible light communication-band metasurface modulators with niobium plasmonic nano-antenna arrays