亚毫米尺度金属包覆波导超高阶导模的损耗研究

亚毫米尺度金属包覆波导中的超高阶导模具有一些重要性质,如偏振不灵敏性,对波导参数及入射光波长非常灵敏的特性,这引起了人们对它研究的极大兴趣.基于亚毫米尺度金属包覆波导,已经实现了一些具有良好光学特性和实用价值的导波光电子器件.该文用一阶微扰理论对亚毫米尺度金属包覆波导中的超高阶导模的损耗性质进行了详细的研究,发现超高阶导模在波导中的传输损耗随着光入射角度的减小而急剧增大,也即随着其模序数的增大而增大,并且导波层的厚度越大,其超高阶导模的传输损耗越小.

Study on the Loss of Ultra-High Order Modes in the Symmetrical Metal-Cladding Waveguide with Sub-Millimeter Scale

There are some important characteristic of ultra-high order modes in the symmetrical metal-cladding optical waveguide with sub-millimeter scale,such as polarization-independence,high sensitivity to parameters of the waveguides and the wavelength of the incident light.Because of its special characteristic,people have more and more interest in studying the ultra-high order modes.And some optoelectronic devices with good optical parameters and utilitarian values which based on symmetrical metal-cladding optical waveguide with sub-millimeter scale have been achieved.In this paper,the propagation loss of the ultra-high order modes in the waveguide has been studied by the first order disturbance theory.And it is found that the propagation loss becomes heavy when the incident angle of the light becomes small and the modes order number becomes big.But it is also found that thicker is the waveguides,less is the loss of the ultra-high order modes.