Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, UK
Centre for Quantum Photonics, H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK.
Philos Trans A Math Phys Eng Sci. 2016 Aug 28;374(2075). doi: 10.1098/rsta.2015.0263.
Photonic crystal waveguides are known to support C-points-point-like polarization singularities with local chirality. Such points can couple with dipole-like emitters to produce highly directional emission, from which spin-photon entanglers can be built. Much is made of the promise of using slow-light modes to enhance this light-matter coupling. Here we explore the transition from travelling to standing waves for two different photonic crystal waveguide designs. We find that time-reversal symmetry and the reciprocal nature of light places constraints on using C-points in the slow-light regime. We observe two distinctly different mechanisms through which this condition is satisfied in the two waveguides. In the waveguide designs, we consider a modest group velocity of vg≈c/10 is found to be the optimum for slow-light coupling to the C-points.This article is part of the themed issue 'Unifying physics and technology in light of Maxwell's equations'.
光子晶体波导已知支持具有局部手性的 C 点-点极化奇点。这样的点可以与偶极子发射器耦合，从而产生高度定向的发射，从中可以构建自旋光子纠缠器。人们非常关注利用慢光模式来增强这种光物质耦合的前景。在这里，我们探索了两种不同光子晶体波导设计的行波到驻波的转变。我们发现，时间反转对称性和光的互易性对在慢光区使用 C 点施加了限制。我们观察到在这两种波导中满足该条件的两种截然不同的机制。在所考虑的波导设计中，我们发现，对于与 C 点的慢光耦合，适中的群速度 vg≈c/10 是最佳的。本文是主题为“根据麦克斯韦方程组统一物理和技术”的特刊的一部分。
