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arXiv 1306.3832physics.optics
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光子晶体薄膜吸收特性的模态剪裁方法

Modal approach for tailoring the absorption in a photonic crystal membrane

Romain Peretti, Guillaume Gomard, Christian Seassal, Xavier Letartre, Emmanuel Drouard

摘要:

在本文中,我们提出了一种方法来定制的吸收在光子晶体膜。为此,我们首先应用时域耦合模理论,这样的亚波长膜,并证明,即使是对称膜,如果涉及简并模式,也可以达到100%的共振吸收。然后从该模型中导出设计规则,以调整吸收。随后,使用时域有限差分模拟作为概念证明,并在具有对应于非晶硅在约720 nm处的光学指数的高折射率的低吸收材料(消光系数=10-2)上进行。这样做,获得了85%的共振吸收,这明显高于通常报道的50%最大值。最后对这些结果进行了理论分析和验证,以便将我们的方法推广到其他材料、结构和应用中。

英文摘要:

In this paper, we propose a method for tailoring the absorption in a photonic crystal membrane. For that purpose, we first applied Time Domain Coupled Mode Theory to such a subwavelength membrane and demonstrated that 100% resonant absorption can be reached even for a symmetric membrane, if degenerate modes are involved. Design rules were then derived from this model in order to tune the absorption. Subsequently, Finite Difference Time Domain simulations were used as a proof of concept and carried out on a low absorbing material (extinction coefficient=10-2) with a high refractive index corresponding to the optical indices of amorphous silicon at around 720 nm. In doing so, 85% resonant absorption was obtained, which is significantly higher than the commonly reported 50% maximum value. Those results were finally analyzed and confronted to theory so as to extend our method to other materials, configurations and applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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