Open AccessFocusing property of two-dimensional photonic crystals with ring-shaped air holes
Author(s) -
Lingkai Kong,
Zhiqiang Zhang,
Feng Zhu,
Xiaoyan Li,
Cuihua Jiang,
Hai Ming
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.7702
Subject(s) - finite difference time domain method , radius , optics , plane wave expansion , photonic crystal , slab , hexagonal lattice , dielectric , ring (chemistry) , refractive index , materials science , physics , negative refraction , condensed matter physics , optoelectronics , chemistry , computer security , organic chemistry , geophysics , antiferromagnetism , computer science
Imaging properties of two-dimensional photonic crystal slab lens consisting of a triangular lattice of ring-shaped air holes in a high-refraction-index dielectric medium have been studied. The results calculated by the plane wave expansion method PWE and the finite-difference time-domain method FDTD show that the effective index n=-1 can be realized in this structure. A perfect image can be obtained by increasing the inner radius of ring-shaped holes from 0 to 0.13a with the outer radius 0.4a at the normalized frequency 0.3a/λ. Based on the result of normalized frequency with effective refraction index -1 versus inner radius of ring-shaped holes we theoretically analyzed the effects of structure parameters to equifrequency contours of respective normalized frequency and imaging properties.