Photonic crystal surface modes narrow-band filtering.
Photonic crystal surface modes narrow-band filtering.
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DOI：
10.1364/opex.13.005783
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发表时间：
2005-07
期刊：
影响因子：
3.8
通讯作者：
E. Popov;S. Enoch
中科院分区：
文献类型：
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作者：
E. Popov;S. Enoch
已知穿过二维光子晶体板的光传输会出现禁带。通过对板片表面切割的特定选择，可以引入在晶体表面附近引导的模式，该模式可以具有位于禁带内部的传播常数。这些模式可以使用放置在表面上的附加衍射光栅来激发。这种谐振激励会在间隙中引入缺陷，从而导致窄带传输达到 100% 最大值。通过在垂直入射附近工作，可以利用布拉格单元边界附近的模式色散曲线的平坦化，并降低对光束平行度的要求，同时保持强的光谱选择性。
Light transmission through a slab of two-dimensional photonic crystal is known to present forbidden gaps. By a particular choice of he surface cut of the slab, it is possible to introduce modes guided in the vicinity of the crystal surface, which can have propagation constants lying inside the forbidden gap. These modes can be excited using additional diffraction gratings positioned onto the surfaces. This resonant excitation introduces defects in the gap that can lead to a narrow-band transmission with a 100% maximum. By working near normal incidence, it is possible to use the flattening of the mode dispersion curve near the Bragg cell boundaries and to reduce the requirements for beam parallelism, while preserving the strong spectral selectivity.