Polarization Engineering in Photonic Crystal Waveguides for Spin-Photon Entanglers.
Polarization Engineering in Photonic Crystal Waveguides for Spin-Photon Entanglers.
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DOI：
10.1103/physrevlett.115.153901
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发表时间：
2014-06
影响因子：
8.6
通讯作者：
A. Young;A. Thijssen;D. Beggs;P. Androvitsaneas;L. Kuipers;J. Rarity;S. Hughes;R. Oulton
中科院分区：
文献类型：
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作者：
A. Young;A. Thijssen;D. Beggs;P. Androvitsaneas;L. Kuipers;J. Rarity;S. Hughes;R. Oulton
通过对光子晶体波导中投影的局域态密度(LDOS)的全面分析，我们发现位相在光-物质相互作用的对称性中起着至关重要的作用。通过考虑量子点(QD)自旋耦合到光子晶体波导(PCW)模，我们证明了光-物质相互作用可以是不对称的，从而导致单向发射和确定的纠缠光子源。此外，我们还表明，了解与LDOS和量子点自旋相关的相位对于可以在PCW中用量子点实现的一系列器件来说是至关重要的。我们还展示了量子干涉的抑制如何防止偶极子在波导中的反射，并强调了描述这些自旋相关系统中光-物质相互作用的半经典偶极近似的根本崩溃。
By performing a full analysis of the projected local density of states (LDOS) in a photonic crystal waveguide, we show that phase plays a crucial role in the symmetry of the light-matter interaction. By considering a quantum dot (QD) spin coupled to a photonic crystal waveguide (PCW) mode, we demonstrate that the light-matter interaction can be asymmetric, leading to unidirectional emission and a deterministic entangled photon source. Further we show that understanding the phase associated with both the LDOS and the QD spin is essential for a range of devices that can be realized with a QD in a PCW. We also show how suppression of quantum interference prevents dipole induced reflection in the waveguide, and highlight a fundamental breakdown of the semiclassical dipole approximation for describing light-matter interactions in these spin dependent systems.