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基于法布里-珀罗腔理论,研究了由2块相同单负材料作为反射镜构成微腔结构的共振特性。若反射镜是负ε材料,在一定条件下可实现TM腔模的全向透射;若是负μ材料,则可实现TE腔模的全向透射。随着入射角的增大,全向透射谱变窄,品质因子提高。腔中介质折射率的提高,可有效缩短TM全向透射微腔结构的尺寸,但对TE全向透射微腔结构尺寸的调制就稍弱。单负材料损耗的存在,不会破坏两种微腔结构的全向共振特性,但随着入射角的增大腔模的透射率有所降低。通过优化处理给出了这两种微腔结构能实现全向透射时所需满足的各种条件,为全向滤波器的设计提供理论指导。
Based on the Fabry-Perot cavity theory, the resonant characteristics of a microcavity structure composed of two identical single-negative materials as a mirror are studied. If the mirror is negative ε material, under certain conditions can be achieved TM mode cavity omnidirectional transmission; if the negative μ material, you can achieve the TE cavity mode omni-directional transmission. As the incident angle increases, the omnidirectional transmission spectrum becomes narrower and the quality factor increases. The increase of the refractive index of the cavity medium can effectively shorten the size of TM omnidirectional transmission microcavity structure, but the modulation of TE omnidirectional transmission microcavity structure size is weaker. The existence of single-negative material loss will not undermine the omnidirectional resonance characteristics of the two microcavity structures, but the transmittance of the cavity modems decreases with the incident angle. The optimal conditions for these two kinds of microcavity structures to be achieved in omni-directional transmission are given, which provide theoretical guidance for the design of omnidirectional filters.