Abstract

We theoretically demonstrate the imaging properties of a complex two-dimensional (2D) face-centered square lattice photonic crystal (PC) made from germanium cylinders in air background. The finite-difference time-domain (FDTD) method is employed to calculate the band structure and simulate image construction. The band diagram of the complex structure is significantly compressed. Negative refraction occurs in the second energy band with negative phase velocity at a frequency of 0.228 (2\pi c/a), which is lower than results from previous studies. Lower negative refraction frequency leads to higher image resolution. Numerical results show that the spatial resolution of the system reaches 0.7296 \lambda, which is lower than the incident wavelength.

© 2013 Chinese Optics Letters

Optimal design of a two-dimensional photonic crystal of square lattice with a large complete two-dimensional bandgap

Min Qiu and Sailing He
J. Opt. Soc. Am. B 17(6) 1027-1030 (2000)

Holographic design of a two-dimensional photonic crystal of square lattice with a large two-dimensional complete bandgap

L. Z. Cai, G. Y. Dong, C. S. Feng, X. L. Yang, X. X. Shen, and X. F. Meng
J. Opt. Soc. Am. B 23(8) 1708-1711 (2006)

Subwavelength imaging of a point source based on two-dimensional photonic crystals

Hongliang Ma, Binming Liang, Songlin Zhuang, Jiabi Chen, Qiang Jiang, and Junwei Ding
Opt. Lett. 41(16) 3833-3835 (2016)

Holographic design of a two-dimensional photonic crystal of square lattice with pincushion columns and large complete band gaps

L. Z. Cai, C. S. Feng, M. Z. He, X. L. Yang, X. F. Meng, G. Y. Dong, and X. Q. Yu
Opt. Express 13(11) 4325-4330 (2005)

Maximizing band gaps in two-dimensional photonic crystals in square lattices

Xiao-liang Cheng and Jing Yang
J. Opt. Soc. Am. A 30(11) 2314-2319 (2013)