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利用椭圆形孔替代传统光子晶体薄板波导中邻接波导的最内层两排圆孔构成一种新型低损耗光子晶体薄板光波导.该波导的群速度和群速度色散特性强烈依赖于波导中这两排邻接波导的椭圆孔的特性.借助波导导模展开方法,计算得到波导的能带结构和群指数,并分析了它们与椭圆孔的参数关系.通过优化这些椭圆孔的参数,可以增加光子晶体光波导导模在光锥以下的无固有传输损耗带宽,在2—4.5nm的带宽上实现无色散的常数群速度.这些理论结果将为低损耗低色散慢光波导的设计制造提供理论基础.
A new type of low loss photonic crystal thin-film optical waveguide is formed by replacing the innermost two rows of circular holes in the adjacent waveguide in the traditional photonic crystal thin-film waveguides with elliptical holes. The group velocity and the group velocity dispersion characteristics of the waveguide depend strongly on these two The characteristics of the elliptical aperture of the adjoining waveguides are obtained.The energy band structure and group index of the waveguide are calculated and the parameters of the elliptical aperture are analyzed by means of waveguide mode unwrapping.The photonic crystals The optical waveguide guided modes have no intrinsic transmission loss bandwidth below the optical cone and no-dispersion constant group velocity over a bandwidth of 2-4.5 nm. These theoretical results will provide a theoretical basis for the design and manufacture of low-loss and low-dispersion slow optical waveguides.