Abstract

In this Letter, a photonic crystal (PC) flat lens with a scatterer-size gradient is proposed, which simultaneously achieves imaging of the point source and sub-wavelength focusing of the plane wave in the first, second, and fifth bands. The imaging of the point source breaks through the diffraction limit in the second and fifth bands. The PC flat lens with the scatterer-size gradient is expected to be used in a new multifunctional optical imaging and focusing device, which improves the application potential of a PC flat lens.

© 2019 Chinese Laser Press

Large object distance and super-resolution graded-index photonic crystal flat lens

Shengnan Liang, Jianlan Xie, Pinghua Tang, and Jianjun Liu
Opt. Express 27(7) 9601-9609 (2019)

Negative refraction and flat-lens focusing in a 2D square-lattice photonic crystal at microwave and millimeter wave frequencies

R. Meisels, R. Gajić, F. Kuchar, and K. Hingerl
Opt. Express 14(15) 6766-6777 (2006)

Subwavelength imaging by a graded-index photonic-crystal flat lens in a honeycomb lattice

Peng Shi, Kun Huang, and Yong-ping Li
J. Opt. Soc. Am. A 28(10) 2171-2175 (2011)

Wavelength dependence of focusing properties of two-dimensional photonic quasicrystal flat lens

Jianjun Liu, Zhigang Fan, Haili Hu, Maohua Yang, Chunying Guan, Libo Yuan, Hao Guo, and Xiong Zhang
Opt. Lett. 37(10) 1730-1732 (2012)

Focusing of electromagnetic waves by a left-handed metamaterial flat lens

Koray Aydin, Irfan Bulu, and Ekmel Ozbay
Opt. Express 13(22) 8753-8759 (2005)