An analog of photon-assisted tunneling in a periodically modulated waveguide array.

An analog of photon-assisted tunneling in a periodically modulated waveguide array.
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周期性调制波导阵列中光子辅助隧道效应的模拟

DOI:
10.1038/srep35744
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发表时间:
2016-10-21
期刊:
影响因子:
4.6
通讯作者:
Wu Y
Wu Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Li L;Luo X;Yang X;Wang M;Lü X;Wu Y

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通过对非高频区三通道光波导系统的研究,从理论上模拟了周期驱动格子阵列中暗Floquit态产生的光子辅助隧道效应(PAT)。这种模拟的PAT只需周期性地调制顶部波导并调整底部与其相邻波导之间的距离即可实现。数值计算表明,在五通道波导系统中也存在PAT共振,并且可能存在于具有其他奇数个波导的波导阵中,但随着波导数目的增加,PAT共振会变得很弱。由于起源不同于传统的PAT,我们在工作中发现的这种PAT与零能(暗)Floquit态的存在密切相关。它在目前可获得的实验条件下很容易观察到,并可用于控制光在波导阵列中的传播。
We theoretically report an analog of photon-assisted tunneling (PAT) originated from dark Floquet state in a periodically driven lattice array without a static biased potential by studying a three-channel waveguide system in a non-high-frequency regime. This analog of PAT can be achieved by only periodically modulating the top waveguide and adjusting the distance between the bottom and its adjacent waveguide. It is numerically shown that the PAT resonances also exist in the five-channel waveguide system and probably exist in the waveguide arrays with other odd numbers of waveguides, but they will become weak as the number of waveguides increases. With origin different from traditional PAT, this type of PAT found in our work is closely linked to the existence of the zero-energy (dark) Floquet states. It is readily observable under currently accessible experimental conditions and may be useful for controlling light propagation in waveguide arrays.
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