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首页> 外文期刊>Scientific reports. >Anomalous transparency in photonic crystals and its application to point-by-point grating inscription in photonic crystal fibers
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Anomalous transparency in photonic crystals and its application to point-by-point grating inscription in photonic crystal fibers

机译：光子晶体中的异常透明度及其在光子晶体纤维中的逐点光栅铭文中的应用

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It is common belief that photonic crystals behave similarly to isotropic and transparent media only when their feature sizes are much smaller than the wavelength of light. Here, we counter that belief and we report on photonic crystals that are transparent for anomalously high normalized frequencies up to 0.9, where the crystal’s feature sizes are comparable with the free space wavelength. Using traditional photonic band theory, we demonstrate that the isofrequency curves can be circular in the region above the first stop band for triangular lattice photonic crystals. In addition, by simulating how efficiently a tightly focused Gaussian beam propagates through the photonic crystal slab, we judge on the photonic crystal’s transparency rather than on isotropy only. Using this approach, we identified a wide range of photonic crystal parameters that provide anomalous transparency. Our findings indicate the possibility to scale up the features of photonic crystals and to extend their operational wavelength range for applications including optical cloaking and graded index guiding. We applied our result in the domain of femtosecond laser micromachining, by demonstrating what we believe to be the first point-by-point grating inscribed in a multi-ring photonic crystal fiber.
机译：常见的是，仅当它们的特征尺寸远小于光的波长时，光子晶体同样地表达与各向同性和透明介质类似。在这里，我们反击该信念，我们报告了对高达0.9的异常高归一化频率透明的光子晶体，其中晶体的特征尺寸与自由空间波长相当。使用传统的光子频带理论，我们证明了型曲线可以是三角形晶格光子晶体的第一挡槽的区域中的圆形曲线。另外，通过模拟有效地通过光子晶体板传播的有效，我们仅判断光子晶体的透明度而不是在各向同性上。使用这种方法，我们确定了提供异常透明度的广泛的光子晶体参数。我们的研究结果表明，扩大光子晶体的特征并扩展其运行波长范围的可能性，以供包括光学覆盖和分级指数引导的应用。我们通过演示我们认为是在多环光子晶体纤维中铭刻的第一点逐点光栅的Femtosecond激光微机器领域的结果。

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