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In this work, we for the first time propose and demonstrate a feasible strategy for multi-band ultra-narrow optical transmission of the plasmonic crystals by introducing a high-index dielectric (HID) cavity, which can be acted as an efficient optical field coupling and hybridization component. Five sharp transmission bands with the maximal bandwidth of 6.5 nm are achieved. High spectral Q-factor of 327 with the corresponding bandwidth of 2.8 nm is observed in the optical region. These features pave a simple and universal way for multispectral narrowband optical transmission based on the typical plasmonic crystals. [ABSTRACT FROM AUTHOR]

Highly conductive metal film structures with light transparency are of great importance for practical applications in optoelectronics. Here we investigate the feasible way for tuning the intrinsic opaque continuous metal film to be optical transparency by using a dielectric layer. The introduced dielectric acts as a resonant cavity and supports strong optical field coupling capability. In comparison with the nearly opaque response of the original metal film, transmission enhancement factor up to 2300% with the maximal transmittance of 78% are achieved in the dielectric cavity coupled metal film system. Moreover, it is observed that the multiband light transmission behavior can be highly scaled by tuning the cavity length. These impressive optical properties suggest the proposed motif to be a new alternative way for achieving transparent and highly conducting metal film structures with potential applications in transparent conductors, plasmonic filters and images. [ABSTRACT FROM AUTHOR]