Focusing properties of a photonic crystal slab with negative refraction

被引：75
|
作者：
He, SL [1 ]
Ruan, ZC
Chen, L
Shen, JQ
机构：
[1] Royal Inst Technol, State Key Lab Modern Opt Instrumentat, Ctr Opt & Electromagnet Res, Joint Res Ctr Photon, Stockholm, Sweden
[2] Zhejiang Univ, Hangzhou 310027, Peoples R China
[3] Royal Inst Technol, Div Electromagnet Theory, Alfven Lab, S-10044 Stockholm, Sweden
来源：
PHYSICAL REVIEW B | 2004年 / 70卷 / 11期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1103/PhysRevB.70.115113
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A layered Korringa-Kohn-Rostoker method is exploited to study the subwavelength imaging through a slab of rods-in-air photonic crystal. Both the intensity and phase spectra of transmission are investigated. The high transmission of evanescent waves arises due to the excitation of some slab-guided bound modes and the high coupling between the incident evanescent field and some bulk-guided Bloch modes. Through a study of the phase spectrum of transmission, it is shown that the self-collimation effect occurs at smaller incident angles whereas the negative refraction effect occurs at relatively larger incident angles. The existence of imaging aberrations is also explained with the phase spectrum. The focusing properties of the photonic crystal slab are mainly due to the negative-refraction effect for large incident angles, rather than the self-collimation effect.
引用
收藏
页码：115113 / 1
页数：10
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