摘要
本文采用硅柱子周期性排列构成六角结构光子晶体,用平面波展开方法和FDTD方法研究表明,此结构光子晶体存在等效折射率接近-1的频率区域.在等效折射率趋于-1但不等于-1时,此光子晶体平板结构超透镜能形成一个非近场的像.模拟还发现,此结构平板光子晶体等效折射率为非-1时,可以亚波长成像.
This paper aims at designing a 2D photonic crystal(PC) with negative refractive index close to -1.Plane wave expansion method(PWEM) is used to obtain the band diagram and its equal-frequency surface(EFS).And the finite difference time domain(FDTD) simulation method is also used to analyze the equivalent refractive index of the PC.The results show the equivalent refractive index of the PC close to -1 within a certain frequency band.A super-lens is formed by this photonic crystal,which can form a non-near-field image.Moreover,the super-lens has the capability of subwavelength imaging with its effective index close to-1.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第5期311-315,共5页
Acta Physica Sinica
基金
国家重点基础研究发展计划(批准号:2005CB724304)
国家自然科学基金(批准号:60777045)
校博士科研启动基金(批准号:1D-00-341-003)资助的课题~~
关键词
负折射
光子晶体
亚波长
成像
negative refraction
photonic crystals
sub-wavelength
imaging