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We propose and numerically investigate the thermal-insensitive properties of a wavelength-selectivefilter based on heterostructure photonic crystals with ultralow-refractive-index metallic nanowires.The operational principle of the proposed device is based on the photon trapping by total externalreflections between the ultralow refractive index metamaterial claddings and the guiding air cores.The low propagation losses, the ultracompact size as well as the temperature-insensitive operationare the main advantages of the proposed metamaterial technology, making the proposedde-multiplexer an excellent candidate for applications in nanophotonic-integrated systems operatingin the visible frequency spectrum

Low-temperature-sensitivity heterostructure photonic-crystal wavelength-selective filter based on ultralow-refractive-index metamaterials