Abstract
In the past, the polarization-insensitive absorption is realized mainly employing the two-dimensional periodic structure of fourfold rotational symmetry, which greatly increases the manufacturing complexity and cost. Here, we present the numerical design of a polarization-independent near-perfect absorber incorporating one-dimensional embedded aluminum grating. The absorption peaks near 99% at 520-nm wavelength for different polarization angles are achieved. The underlying mechanism associated with the resonance is attributed to the magnetic polariton resonance and the cavity-mode resonance for TM and TE polarization, respectively, and further explained by the inductor-capacitor circuit model and the eigen equation of cavity mode. Furthermore, the effects of geometrical parameters of the nano-cavity on the absorption performance are discussed. The proposed structure may provide a new way to achieve polarization-independent absorption with one-dimensional meta-surface, which has broad applications in plasmonic sensors, photo-detectors, and so on.
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Funding
This work was supported by the National Natural Science Foundation of China (NSFC, Grant No. 61505134, 61575133, 91023044), National Key Research and Development Plan (Grant No. 2016YFF0100900), Jiangsu Science and Technology Project (Grant No. BE2016079, BZ2016008), and the project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Zhou, Y., Zhang, H., Luo, M. et al. Polarization-Independent Narrowband Near-Perfect Absorption Based on One-Dimension Embedded Aluminum Grating. Plasmonics 14, 999–1004 (2019). https://doi.org/10.1007/s11468-018-0886-0
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DOI: https://doi.org/10.1007/s11468-018-0886-0