Multispectral Sharp Plasmon Resonances for Polarization-Manipulated Subtractive Polychromatic Filtering and Sensing

Abstract

Compared with the conventional color filter with the only one fixed output color filtering, developing active multicolor filters with controllable color output can lead to more compact and sophisticated color filter-based devices. We propose and demonstrate a plasmon scheme consisting of a nonclose-packed cross-shaped metallic antenna array for active subtractive multicolor filtering and high-quality sensing. Multiband antireflection spectrum with ultra-narrow bandwidths (<10 nm) in the optical region is achieved, which could be tuned quasi-quantitatively by controlling the incidence polarization state. The multispectral optical features are with high scalability via properly tuning the geometry parameters or the crystal symmetry. In addition, high-performance sensing is realized in such ultra-compact nanoplasmonic structure (~λ/4) and suggests one more way to artificially modify the polychromatic color filtering. The results presented by such a scheme open up a new approach for the multispectral nanophotonic device platform that combines the unique merits of multiband, sharp resonances with polarization-adjusting and plasmonic-integrated photonics.