链式微腔的低损耗光传输特性

Low-loss light propagation in the chain of mi crocavities

针对微腔的光子聚焦独特性质,研究微腔光子聚焦光束的耦合特性及光子传输效率,提出了一种新型链式微腔的光传输方法,分析了球形微腔的光子聚焦强度、位置与入射波长的关系,得到了平面波入射到链式球形微腔的光强分布及传输特性.仿真结果和分析表明,微腔的光子聚焦效应及光场的后向放大效应使链式微腔具有高聚焦波束和低损耗特性,可以应用于低损耗光波导的设计;在亚波长空间分辨率的光学微探针、微创激光手术、光镊等方面也具有实际的应用价值.

According to the focusing property of the photonic nanojet,the coupling characteristics for the chain of microcavities have been studied.Low-loss light propagation in the chain of microcavities is proposed.The influence of different wavelengths on the intensity of the photonic nanojet and the location of the focal spot are given.Intensity distribution and transmission characteristics for the chain of coupled spherical microcavities are analysed.Simulation results and theoretical analysis show that the chain of spherical microcavities has a highly focused beam and low-loss characteristics because of the focusing effect and backscattering enhancement of the photonic nanojet.A low-loss waveguide can be designed by using these properties of the chain of spherical microcavities.Sub-wavelength focusing of the beam,high optical throughput,and broad spectral transmission properties make the chains of microspheres able to be used in a variety of biomedical applications including minimally invasive and ultraprecise laser surgery.