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arXiv 1202.4313physics.opticscond-mat.mtrl-sciquant-ph
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用于集成量子光子学的GaN定向耦合器

GaN directional couplers for integrated quantum photonics

Yanfeng Zhang, Loyd McKnight, Erman Engin, Ian M. Watson, Martin J. Cryan, Erdan Gu, Mark G. Thompson, Stephane Calvez, Jeremy L. O'Brien, Martin D. Dawson

摘要:

大截面GAN波导被认为是实现集成量子光子电路的合适结构。这种几何形状的定向耦合器已被设计与援助的光束传播方法和使用电感耦合等离子体蚀刻制造。扫描电子显微镜检查表明,高品质的端面耦合和耦合区域中的肋对之间的明确定义的间隙。在800 nm处的光学特性示出了单模操作和耦合长度依赖的分光比。通过测量可见度为96%的宏欧曼德尔倾角,在定向耦合器中观察到简并光子对的双光子干涉。

英文摘要:

Large cross-section GaN waveguides are proposed as a suitable architecture to achieve integrated quantum photonic circuits. Directional couplers with this geometry have been designed with aid of the beam propagation method and fabricated using inductively coupled plasma etching. Scanning electron microscopy inspection shows high quality facets for end coupling and a well defined gap between rib pairs in the coupling region. Optical characterization at 800 nm shows single-mode operation and coupling-length-dependent splitting ratios. Two photon interference of degenerate photon pairs has been observed in the directional coupler by measurement of the Hong-Ou-Mandel dip with 96% visibility.

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