报告题目：Excellent LOPA direct laser writing technique for deterministic coupling of a quantum dot based single photon source into polymeric photonic structures
报告人：Ngoc Diep LAI
报告人单位：École Normale Supérieure Paris-Saclay
邀请人：黄坤 研究员
地点：闵行校区光学大楼A508会议室
报告时间：2024年6月11日（周二），下午14:00-16:00
报告摘要：
In the last few years, the broad research fields of Nanophotonic and Quantum Optics have shown increasing common interests, which are now regularly explored with nano-emitters. A major tool to develop quantum functionalities in integrated optical circuit or nanostructures is guiding or confining light at the nanoscale. Shaping the electromagnetic environment of a single photon emitter using dielectric cavities allows a full control of the emitter spontaneous emission and the fabrication of bright single photon sources. A challenge is to couple deterministically a single emitter to a photonic multi-dimensional structure in order to fully enhance its optical properties (such as brightness, spectrum, lifetime, etc.), and also to manipulate the propagation of light on demand, which is crucial for quantum information application. In this talk, I will first introduce the LOPA (Low one-photon absorption) technique as an excellent way for achieving this goal. I will explain how the LOPA technique allowing very flexibly realization of 2D and 3D nanometric structures. I will show that this LOPA technique is excellent for enhancing the stability of the quantum dot based single photon source. Then, I will explain how the quantum dot based single photon source can be inserted on demand into any polymeric photonic structure. It was evident that the position of the QD inside a polymeric pillar is a crucial factor of the extraction of the emitted photons. The single photon number is enhanced up to 5 folds and the single photon quality is increased about 60% with a selected orientation of the QD thanks to the high directional emission of the coupled QD/photonic system.
报告人简介：
Ngoc Diep Lai obtained a Ph.D. degree in laser physics at the University of Rennes 1 (France) in 2003. He spent 4 years at the National Chung Cheng University (Taiwan), for his first Postdoctoral Research. His work focused on studies of nonlinear properties of polymer materials and nanotechnologies for fabrication of polymer-based photonic crystals. In 2007, he joined the Quantum Nanophotonics Research Group of the Quantum Photonics and Molecular Laboratory (now becomes LUMIN laboratory) of the École Normale Supérieure de Cachan (now called ENS Paris-Saclay), France. He worked towards the optimization of single photons source, coherent manipulation of single-electron spin associated to color center in diamond, and super-resolution imaging techniques. He is hired in 2009 at ENS Paris-Saclay as an Assistant Professor and he became an Associate Professor in 2013. His current research focuses on elaboration of magneto/photonic/plasmonic and quantum nanostructures by optical lithography technique and various applications. He has supervised and co- supervised 13 PhD students in the domain of the photonic crystals and nonlinear photonic crystals, optical and magnetic manipulations of single solid-state emitters, plasmonics and laser. He is co- authored 81 peer-review articles, 4 book chapters, and 22 proceedings papers. He is actually a coordinator of the Monabiphot international master program (changed to PhysEnBio program from Sept. 2024) of the University Paris-Saclay, France.