We propose a technique capable of designing fishnet metamaterials that have a negative refractive index (NRI) over a broad range in the visible and infrared. The technique relies on optimizing the shape and scale of the fishnet apertures as well as the depth of different layers of the composite. A metamaterial is obtained that exhibits an unbroken 552 nm bandwidth of NRI, covering the entire red and infrared regions. Moreover, two fishnet structures perforated with star-like holes are found to render refractive index negative in the yellow and green spectra.
© 2014 Optical Society of America
Original Manuscript: January 30, 2014
Revised Manuscript: March 16, 2014
Manuscript Accepted: March 17, 2014
Published: April 10, 2014
Shiwei Zhou, Scott Townsend, Yi Min Xie, Xiaodong Huang, Jianhu Shen, and Qing Li, "Design of fishnet metamaterials with broadband negative refractive index in the visible spectrum," Opt. Lett. 39, 2415-2418 (2014)