单负材料平面微腔结构的共振模研究

利用传输矩阵法研究了由单负材料构成的平面微腔结构的共振模特性。研究表明,腔模频率主要由腔中介质的物质参数和结构参数来决定。单负材料层的厚度影响共振模的线宽,随厚度增加而谱线变窄。单负材料损耗的存在,影响共振模的透射率,使腔内局域电场减小。选择合适的单负材料层厚度,可使腔中局域电场达到最大。还研究了斜入射时腔模的偏振特性,在一定条件下可实现TM腔模的全向透射,用以设计全向滤波器。

Study of Resonant Modes of a Planar Microcavity Composed of Single-Negative Materials

The resonant mode characteristics of a planar microcavity composed of single-negative materials（SNG） are studied with the transfer matrix method.It shows that the resonant frequency is mainly determined by the material parameters and structure parameters of the dielectric in cavity.However,the line width（FWHM） is affected by the thickness of SNG reflective layer and it tends to be narrow with thickness increasing.The absorption of SNG decreases the transmittance of resonant mode and reduces the local electric field in the cavity.With the appropriate thickness of SNG,the local electric field in the cavity can reach the maximum.The polarization properties of the resonant modes are also studied.Under certain conditions,the omnidirectional transmission of TM resonant mode can be realized,which is useful for designing an omnidirectional filter.