Mermillod Q, Jakubczyk T, Delmonte V, Delga A, Peinke E, Gérard J-M, Claudon J, Kasprzak J
Univ. Grenoble Alpes, F-38000 Grenoble, France.
CNRS, Institut Néel, "Nanophysique et semiconducteurs" group, F-38000 Grenoble, France.
Phys Rev Lett. 2016 Apr 22;116(16):163903. doi: 10.1103/PhysRevLett.116.163903.
We perform coherent nonlinear spectroscopy of individual excitons strongly confined in single InAs quantum dots (QDs). The retrieval of their intrinsically weak four-wave mixing (FWM) response is enabled by a one-dimensional dielectric waveguide antenna. Compared to a similar QD embedded in bulk media, the FWM detection sensitivity is enhanced by up to 4 orders of magnitude, over a broad operation bandwidth. Three-beam FWM is employed to investigate coherence and population dynamics within individual QD transitions. We retrieve their homogenous dephasing in a presence of low-frequency spectral wandering. Two-dimensional FWM reveals off-resonant Förster coupling between a pair of distinct QDs embedded in the antenna. We also detect a higher order QD nonlinearity (six-wave mixing) and use it to coherently control the FWM transient. Waveguide antennas enable us to conceive multicolor coherent manipulation schemes of individual emitters.
我们对强限制在单个砷化铟量子点（QD）中的单个激子进行了相干非线性光谱研究。一维介质波导天线能够提取其固有的微弱四波混频（FWM）响应。与嵌入体介质中的类似量子点相比，在较宽的工作带宽内，FWM检测灵敏度提高了多达4个数量级。采用三光束FWM来研究单个量子点跃迁内的相干性和布居动力学。我们在存在低频光谱漂移的情况下提取了它们的均匀退相。二维FWM揭示了嵌入天线中的一对不同量子点之间的非共振福斯特耦合。我们还检测到了高阶量子点非线性（六波混频），并利用它来相干控制FWM瞬态。波导天线使我们能够构思单个发射器的多色相干操纵方案。
