کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
851431 | 909318 | 2011 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Dispersionless slow light by photonic crystal slab waveguide with innermost elliptical air holes Dispersionless slow light by photonic crystal slab waveguide with innermost elliptical air holes](/preview/png/851431.png)
We report a low-loss photonic crystal slab waveguide formed by deforming the innermost circle air holes in the conventional photonic crystal slab waveguide into elliptical ones. We obtain the photonic bands and group index of guided modes in this photonic crystal waveguide by guided-mode expansion method and investigate the dependence of photonic bands and group index of guided modes on the parameters of the innermost elliptical air holes. The group velocity and group velocity dispersion of this waveguide strongly depend on the innermost elliptical air holes. Photonic crystal slab waveguide with the optimum innermost elliptical air holes possesses a wider single mode region below the light line, in which light can easily propagate without intrinsic loss. At the same time, the guided mode supported by this waveguide has nearly constant group velocity and vanishing group velocity dispersion in a 3–5 nm bandwidth.
Journal: Optik - International Journal for Light and Electron Optics - Volume 122, Issue 13, July 2011, Pages 1174–1178