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Materials with ultra-narrowband light transparent window are desirable for applications in optoelectronics. Due to the intrinsic loss in the traditional metallic nanostructures, the plasmonic or electromagnetically induced light transparent spectrum is with a typically broad bandwidth. In this work, a novel strategy for achieving ultra-narrowband optical transparent window is theoretically proposed and demonstrated based on the dielectric dimer resonators metamolecule array. Owing to the electromagnetic resonant coupling in this lossless all-dielectric metamolecule, a transparent window with the bandwidth down to nanometer scale and the spectral slope up to 71%/nm is achieved. The obtained optical properties can be manipulated in the spectral range by adjusting the structural parameters and dielectric permittivity. These findings pave a new way for sharp narrowband transparent window with potential applications in filtering, optical manipulation, etc. [ABSTRACT FROM AUTHOR]

Plasmonic–colloidal crystals are with unique optical properties due to the combination of the plasmonic and photonic features. In this paper, we demonstrate a novel dual-band plasmonic refractometric sensing motif by using a metal film coated colloidal crystal (CC) intercalated with a silicon (Si) layer (M–Si–CC), where the Si layer can simultaneously couple with the top plasmonic crystal and the bottom CC. Distinct sensing behaviors of the two transmittance peaks are observed. In addition, significantly improved sensitivity is achieved in comparison with those of the conventional metal coated CCs (M–CCs). Moreover, the structure is with quite simple design and could be fabricated in a straightforward manner over large areas. These features hold the proposed motif with potential applications in multispectral biosensing and detection. [ABSTRACT FROM AUTHOR]