title: Absolute left-handed behaviors in a triangular elliptical-rod photonic crystal.
abstract: In this paper we theoretically study the left-handed behaviors in a two-dimensional triangular photonic crystal made of elliptical rods in air. An absolute left-handed region is found in the second photonic band by using the plane wave expansion method to analyze the photonic band structure and equifrequency contours. Typical left-handed behaviors such as negative refraction, flat superlensing and plano-concave lensing are demonstrated by the finite-difference time-domain simulations. These behaviors are also compared with the quasi-negative refraction and the resulted focusing effects in a square-lattice two-dimensional photonic crystal.
authors.forename: Zhixiang
authors.initials: Z
authors.lastname: Tang
authors.forename: Runwu
authors.initials: R
authors.lastname: Peng
authors.forename: Dianyuan
authors.initials: D
authors.lastname: Fan
authors.forename: Shuangchun
authors.initials: S
authors.lastname: Wen
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.forename: Liejia
authors.initials: L
authors.lastname: Qian