http://opticalengineering.spiedigitallibrary.org/article.aspx?articleid=1859835&journalid=92
Xiao-Lei Zhao
Tianjin University, College of Precision Instrument and Opto-electronics Engineering, Key Laboratory of Optoelectronic Information Science and Technology, Institute of Laser and Opto-electronics, Tianjin 300072, China
Cai Yuan
Tianjin University, College of Precision Instrument and Opto-electronics Engineering, Key Laboratory of Optoelectronic Information Science and Technology, Institute of Laser and Opto-electronics, Tianjin 300072, China
Shi-Lin Xu, Wen-Hua Lv, Jian-Quan Yao
Tianjin University, College of Precision Instrument and Opto-electronics Engineering, Key Laboratory of Optoelectronic Information Science and Technology, Institute of Laser and Opto-electronics, Tianjin 300072, China
Opt. Eng. 53(4), 045102 (Apr 03, 2014). doi:10.1117/1.OE.53.4.045102
History: Received December 13, 2013; Revised March 6, 2014; Accepted March 7, 2014
Abstract. An asymmetric negative-zero-positive index metamaterial (NZPIM) waveguide with two different Dirac points (DPs) operating in the terahertz (THz) regime is proposed. Its propagating characteristics are investigated by using the graphical method. Due to the linear dispersion near the DPs, the asymmetric NZPIM waveguide exhibits unique properties of guided modes, which are different from that in conventional waveguide but similar to that of electron waves in graphene waveguides. It is shown that the guided mode properties can be tuned by adjusting the incident angular frequency. In addition, the properties of surface-guided modes are also discussed. Our work may have potential applications in THz functional devices as well as reference value in investigating the guided modes of electrons in graphene waveguides.
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