Anomalous zero-group-velocity photonic bonding states with local chirality
Anomalous zero-group-velocity photonic bonding states with local chirality
复制标题
具有局部手性的反常零群速度光子键合态
DOI：
10.1364/josab.35.002356
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
S. Saito
中科院分区：
文献类型：
--
作者：
M. Sotto;K. Debnath;A. Khokhar;I. Tomita;D. Thomson;S. Saito
手性是实现芯片上量子计算的关键特性，因此可以设计出类似于门和晶体管的高效确定性光子构建块。光子晶体波导（pcw）很有希望实现这一目的，因为圆形极化点会使量子发射器（QE）的方向性不平衡。在非对称波导中，局部手性是突出的，并延伸到高场强区域。然而，圆形极化点的珀塞尔效应在带边缘附近饱和，这是量子电动力学（QED）的首选区域。因此，单向性和超强光物质相互作用难以结合。在这里，我们从带边缘附近进行减损，并通过打破镜像对称性来耦合具有不同宇称的模式。实现的光子键合态（PBS）的模拟带结构显示单模异常零群速度（ZGV）点，其能量流远离带边缘，与理想的无限珀塞尔因子同义语。在硅（Si）板中制造的器件显示出极大的减速效应。最重要的是，他们模拟的电场模式在高场强区域具有圆形极化点，QE将获得单向发射行为。这种在pcw中设计PBS的方法为超越手性光物质片上实验铺平了道路。
Chirality is a crucial property to enthrone quantum computation on-chip and thereby engineer efficient deterministic photonic building blocks analogous to gates and transistors. Photonic Crystal Waveguides (PCWs) are promising for this purpose due to circular polarisation points that can unbalance the directionality of a quantum emitter (QE). In non-symmorphic waveguides, the local chirality is prominent and extends into high field intensity regions. Nevertheless, the Purcell effect at circular polarisation points saturates near the band-edge, the preferred region for Quantum ElectroDynamics (QED). Consequently, uni-directionality and ultra-strong light-matter interaction are difficult to combine. Here, we detract from the vicinity of the band-edge, and couple modes with different parities by breaking the mirror symmetry. Simulated bandstructures of the implemented Photonic Bonding States (PBS) display single-mode anomalous zero-group-velocity (ZGV) points with a non-vanishing energy flow far from the band edge, synonymous with an idealistic infinite Purcell Factor. Fabricated devices in Silicon (Si) slabs demonstrate an extremely large slow-down effect. On top of that, their simulated electric field patterns feature circular polarisation points at high field intensity regions where a QE would acquire uni-directional emission behaviour. This method to engineer PBS in PCWs paves the way for outperforming chiral light-matter experiment on-chip.