Multilayer tungsten-alumina-based broadband light absorbers for high-temperature applications

Manohar Chirumamilla, Alexander Roberts, Fei Ding, Deyong Wang, Peter Kjær Kristensen, Sergey Bozhevolnyi, Kjeld Pedersen

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

    104 Citationer (Scopus)


    Efficient broadband absorption of visible and near-infrared light by low
    quality-factor metal-insulator-metal (MIM) resonators using refractory materials is
    reported. Omnidirectional absorption of incident light for broad angles of incidence and
    polarization insensitivity are observed for the fabricated MIM resonator. Excellent
    thermal stability of the absorber is demonstrated at high operating temperatures (800 °C).
    The experimental broadband absorption spectra show good agreement with simulations.
    The resonator with 12 nm top tungsten and 100 nm alumina spacer film shows
    absorbance above 95% in the range of 650 to 1750 nm. The absorption window is tunable
    in terms of the center wavelength, bandwidth, and the value of maximum absorbance
    (~98%) by simple variation of appropriate layer thicknesses. Owing to their flexibility,
    ease of fabrication and low cost, the presented absorbers have the potential for a wide
    range of applications, including the use in commonly used infrared bands or absorbers for
    (solar) thermo-photovoltaic energy conversion, where high absorbance and
    simultaneously low (thermal) re-radiation is of paramount importance.
    TidsskriftOptical Materials Express
    Udgave nummer8
    Sider (fra-til)2704-2714
    StatusUdgivet - 2016


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