Internal Roughness Improves Hyperbolic Metamaterial Absorber |

Andrei Andryieuski, DTU Fotonik, Technical University of Denmark, Kongens Lyngby, Denmark, Andrei V. Lavrinenko, DTU Fotonik, Technical University of Denmark, Kongens Lyngby, Denmark, Sergei V. Zhukovsky, DTU Fotonik, Technical University of Denmark, Kongens Lyngby, Denmark |

Hyperbolic metamaterials (HMMs) can support electromagnetic waves with extremely large wavevectors. Such waves can be excited by an incident plane wave via scattering at surface inhomogeneities [Fig. 1(a)]. Various applications of hyperbolic metamaterials have been suggested [1], including imaging, sensing, thermal radiation engineering and absorbers. Specifically, it was shown earlier [2] that HMMs with roughened outer surface have improved light absorption compared to smooth-surface HMMs. In this work we further investigate the influence of Figure 1. (a) Normally incident plane wave can excite large wavevectors bulk plasmons in HMM via scattering at surface inhomogeneity. (b-c) Absorbance for 5 rough layers (R5) is larger than for 1 rough surface (R1) and 4 ordinary internal (O4) layers for δ=0.05 (b) and δ=0.25 (c). References [1] M. Noginov, M. Lapine, V. Podolskiy, and Y. Kivshar, Focus issue: hyperbolic metamaterials, Optics Express, 2013, vol. 21, pp. 14895–14897. [2] E. Narimanov, H. Li, Y. Barnakov, T. Tumkur, and M. Noginov, Reduced reflection from roughened hyperbolic metamaterials, Optics Express, 2013, vol. 21, pp. 14956-14961. [3] A. Andryieuski, S. V Zhukovsky, and A. V Lavrinenko, Rough metal and dielectric layers make an even better hyperbolic metamaterial absorber, Optics Express, 2014, vol. 22, pp. 14975–14980. |

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