New design of multi-band negative-index metamaterial and absorber at visible frequencies

Author:

Gong Boyi1,Guo Fan1,Zou Wenkang1,Chen Lin1,Song Kun2,Zhao Xiaopeng2

Affiliation:

1. Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, China

2. Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710129, China

Abstract

A new negative-index metamaterial (NIM) structure is proposed by designing the metallic holes of traditional double-fishnet (DF) structures from uniform sizes to several different sizes. Numerical results demonstrate that the new metamaterial, as an improved variant of the DF structure, achieved a multi-band negative refractive index across a wide range of visible frequencies from 470 THz to 540 THz, which covers the red, orange, yellow, and green regions of the visible spectra. Meanwhile, a low-profile nanostrctured absorber was obtained when one side of the perforated metal layer of this multi-band NIM was substituted with a continuous metal film with the same thickness. The absorber showed the high absorption of more than 95% at multiple frequencies of 511, 520, 523, 525, and 527 THz. The behavior of multi-frequency response effectively broadened the working bandwidth. Finally, the physical mechanism of the multi-band operating characteristics of NIM and absorber was analyzed with the distributions of current intensity at different resonant frequencies.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

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