Nanowire Waveguides Launching Single Photons in a Gaussian Mode for Ideal Fiber Coupling

作者：Bulgarini Gabriele^*; Reimer Michael E; Bavinck Maaike Bouwes; Jons Klaus D; Dalacu Dan; Poole Philip J; Bakkers Erik P A M; Zwiller Val

来源：Nano Letters, 2014, 14(7): 4102-4106.

DOI：10.1021/nl501648f

• Quantum dot
• nanowire
• single photon emission
• waveguide modes
• Fourier microscopy

Quantum communication as well as integrated photonic circuits require single photons propagating in a well-defined Gaussian mode. However, tailoring the emission mode to a Gaussian remains an unsolved challenge for solid-state quantum emitters due to their random positioning in the host material or photonic structure. Here, we overcome these limitations by embedding a semiconductor quantum dot in a tapered nanowire waveguide. Owing to the deterministic positioning of the emitter in the waveguide, we demonstrate a Gaussian emission profile in the far field. Hence, we further couple the emission into a single-mode optical fiber with a record efficiency of 93%, thereby addressing a major hurdle for practical implementation of single photon sources in emerging photonic technologies.

• 出版日期2014-7