Gao T, Estrecho E, Li G, Egorov O A, Ma X, Winkler K, Kamp M, Schneider C, Höfling S, Truscott A G, Ostrovskaya E A
Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia.
Institute of Condensed Matter Theory and Solid State Optics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany.
Phys Rev Lett. 2016 Aug 26;117(9):097403. doi: 10.1103/PhysRevLett.117.097403. Epub 2016 Aug 25.
We demonstrate, experimentally and theoretically, a Talbot effect for hybrid light-matter waves-an exciton-polariton condensate formed in a semiconductor microcavity with embedded quantum wells. The characteristic "Talbot carpet" is produced by loading the exciton-polariton condensate into a microstructured one-dimensional periodic array of mesa traps, which creates an array of phase-locked sources for coherent polariton flow in the plane of the quantum wells. The spatial distribution of the Talbot fringes outside the mesas mimics the near-field diffraction of a monochromatic wave on a periodic amplitude and phase grating with the grating period comparable to the wavelength. Despite the lossy nature of the polariton system, the Talbot pattern persists for distances exceeding the size of the mesas by an order of magnitude. Thus, our experiment demonstrates efficient shaping of the two-dimensional flow of coherent exciton polaritons by a one-dimensional "flat lens."
我们通过实验和理论证明了混合光物质波的塔尔博特效应——一种在嵌入量子阱的半导体微腔中形成的激子极化激元凝聚体。通过将激子极化激元凝聚体加载到台面陷阱的微结构化一维周期性阵列中，产生了特征性的“塔尔博特地毯”，这为量子阱平面内的相干极化激元流创建了一系列锁相源。台面外塔尔博特条纹的空间分布类似于单色波在周期振幅和相位光栅上的近场衍射，光栅周期与波长相当。尽管极化激元系统具有损耗特性，但塔尔博特图案在超过台面尺寸一个数量级的距离上仍然存在。因此，我们的实验证明了一维“平面透镜”对相干激子极化激元二维流的有效整形。
