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Opt Express. 2012 Apr 23;20(9):10376-81. doi: 10.1364/OE.20.010376.

Wide-angle polarization independent infrared broadband absorbers based on metallic multi-sized disk arrays.

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  • 1Department of Physics, National Taiwan University, Taipei 10617, Taiwan.


Two-dimensional metallic broadband absorbers on a SiO(2)/Ag/Si substrate were experimentally studied. The absorptivity of such structure can be increased by tailoring the ratio of disk size to the unit cell area. The metallic disk exhibits a localized surface plasmon polariton (LSPP) mode for both TE and TM polarizations. A broadband thermal emitter can be realized because the LSPP mode is independent of the periodicities. By manipulating the ratios and disk sizes, a high-performance, wide-angle, polarization-independent dual band absorber was experimentally achieved. The results demonstrated a substantial flexibility in absorber designs for applications in thermal photovoltaics, sensors, and camouflage.

© 2012 Optical Society of America

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