Light-dressed states under intense optical near fields
Light-dressed states under intense optical near fields
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DOI：
10.1103/physreva.98.053440
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发表时间：
2018-09
影响因子：
2.9
通讯作者：
T. Takeuchi;T. Sako;K. Nobusada
中科院分区：
文献类型：
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作者：
T. Takeuchi;T. Sako;K. Nobusada
从光缀饰态的角度研究了具有强光学近场（ONF）的有限量子系统的激发动力学。一个简单的模型，包括一个单一的电子和一个纳米尺寸的短偶极子源。通过计算ONF作用下的含时波函数，我们证明了ONF的光学响应不仅包括一阶和三阶，而且还包括二阶和四阶谐波，这是传统空间均匀激光场所不能获得的。为了解释奇异高次谐波产生的原因，我们对ONF改变的修饰态进行了研究。结果表明，光学非均匀性对修饰态的空间分布有显著影响，使得宇称破缺使禁戒光跃迁成为可能。这是由ONF的空间不连续性引起的，特别是它的不对称性，这是遗传给穿着状态的。
We studied the excitation dynamics of a finite quantum system with an intense optical near field (ONF) from a perspective of light-dressed states. A simple model consisting of a single electron and a nano-sized short dipole source were employed. By calculating the time-dependent wave function subjected to the ONF, we demonstrated that the optical responses involved not only the first- and third-order but also the second-, fourth-order harmonic generations that were not obtained from conventional spatially homogeneous laser fields. In order to elucidate the origins of the exotic high-order harmonic generations, the dressed states altered by the ONF were explored. The result showed that the spatial distribution of the dressed states were significantly influenced by the ONF, making forbidden optical transitions to be allowed by parity breaking. This was caused by the spatial inhomogeneousness of the ONF, specifically its asymmetry, that was inherited to the dressed states.