摘要
利用图解法系统地研究了由不同类型的单负材料作为包层的三层平板波导的模式特征。研究表明单负介质波导具有一系列奇异的特性,与传统介质波导或左手介质波导相比,此波导的芯区横向振荡导模的模折射率范围较大。除0阶导模外,其它TE,TM导模均为芯区横向振荡模,且同阶的TE、TM模的色散曲线几乎重合,只有0阶的TE,TM模才可以支持表面波的传播。单负介质的结构参数对0阶导模的影响较大。一定条件下,波导中可以出现0阶导模的完全缺失或仅支持表面波的传输,还会出现超慢波现象,甚至可以共生都是后向波的0阶双模。
A graphical method is used to systematically investigate the mode characteristics of an asymmetrical threelayer slab waveguide clad with different single-negative materials. It is demonstrated the waveguide has unusual properties dramatically different from those of conventional waveguide and left-handed material waveguide. The effective refractive index of transverse oscillating guided modes lies in a wider region. In addition, the high-order modes are transverse oscillating guided modes in the core region, only the zero-order one is a surface wave mode. The dispersion curves of high-order TE- and TM- polarized guided modes are nearly the same. The constitutive parameters of single-negative materials have considerable influence on zero-order guided mode. Under certain condition in the waveguide, complete disappearance of zero-order modes, only surface wave propagation, superslow wave, and zero-order dual modes of backward waves will occur.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2008年第10期1888-1892,共5页
Acta Optica Sinica
基金
江苏省高校自然科学基础研究项目(07KJD140036)资助课题
关键词
导波光学
平板波导
单负介质
色散曲线
超慢波
guidedwave optics
slab waveguide
single-negative material（SNG）
dispersion curve
superslow wave
