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arXiv 1810.09686physics.opticscond-mat.dis-nn
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一维弱无序光子晶体临界无序度的直接实验测定

Direct experimental determination of critical disorder in one-dimensional weakly disordered photonic crystals

M. Balasubrahmaniyam, Sushil Mujumdar

摘要:

本文报道了弱无序一维光子晶体临界无序度的实验测量。我们测量的配置平均传输在不同程度的弱无序。我们提取的状态密度(DoS)后,拟合的传输与理论配置文件,并确定弱无序实现的Lifshitz尾。我们观察到范霍夫奇点的消失和平坦的DoS在我们的系统中增加混乱。无序强度的系统变化使我们能够研究Lifshitz指数随无序度的变化。这为一维晶体中的临界无序提供了一个直接的处理方法,已知在该临界无序下系统的输运行为会发生变化。在非常弱的无序在带宽和midgap的DoS变化的矛盾的行为被认为是解决到同步行为超越临界无序。实验测得的传输进行了明确的签名的关键障碍,这是在非常好的协议与理论预期的障碍。

英文摘要:

We report experimental measurement of critical disorder in weakly disordered, one-dimensional photonic crystals. We measure the configurationally-averaged transmission at various degrees of weak disorder. We extract the density of states (DoS) after fitting the transmission with theoretical profiles, and identify the Lifshitz tail realized by weak disorder. We observe the vanishing of Van Hove singularities and the flattening of the DoS with increasing disorder in our system. Systematic variation of disorder strength allows us to study the behavior of Lifshitz exponent with the degree of disorder. This provides a direct handle to the critical disorder in the one-dimensional crystal, at which the transport behavior of the system is known to change. The contradictory behavior at very weak disorder in the DoS variation at the bandedge and the midgap are seen to resolve into synchronous behavior beyond the critical disorder. The experimentally measured transmission is shown to carry a clear signature of the critical disorder, which is in very good agreement with the theoretically expected disorder.

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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