報告題目：PerovLight: Perovskite Materials for Emergent Nanophotonics and Polaritonics
報告人：熊啟華教授
報告時間：2019年6月6日（星期四）下午2:00
報告地點：長安校區啟翔樓233會議室
邀請人：官操教授
承辦學院：柔性電子研究院
聯系電話：8846-0889
報告摘要：
Halide perovskites have recently attracted tremendous attention due to their remarkable properties as an optical gain material, which have shown high performance in solar cells, light-emitting diodes, photodetectors and many other optoelectronic applications. In this talk, I will first review our recent progress in the investigation of halide perovskite materials as excellent optical gain materials, which can be synthesized by either physical or chemical ways. Steady-state and transient spectroscopy approaches can elaborate the large exciton binding energy higher than room temperature thermal excitation energy, and exciton dynamics. High crystalline quality supports the optically pumped photonic lasing based on the intrinsic whispering gallery mode cavity, while the lasing quality factor can be as high as 5000 in all-inorganic perovskite crystals. Next, I will present our experimental realization of room-temperature polariton lasing in all-inorganic cesium lead chloride perovskite crystals embedded in two distributed Bragg reflectors. The perovskite crystals possess efficient polariton-polariton scattering due to the Wannier-Mott exciton nature with large binding energy. The polariton lasing is evidenced by a superlinear power dependence, macroscopic ground state occupation, and increase of the temporal coherence. Finally, we will present our recent results of manipulating polariton Bose-Einstein condensate in one-dimensional perovskite waveguide and lattices, opening a new venue towards room temperature quantum fluids of light and quantum optics.
Key words:Halide Perovskites, Exciton Polariton, Spontaneous coherence, Polariton Laser, Polariton Bose-Einstein Condensate.
References:
1.R. Suet al., “Room temperature one-dimensional polariton condensate propagation in lead halide perovskites”,Science Advances, DOI: 10.1126/sciadv.aau0244 (2018)
2.K.B. Linet al., “Perovskite light-emitting diodes with external quantum efficiency exceeding 20 per cent”,Nature562, 245-248 (2018)
3.J. Xinget al., “Color-stable highly luminescent sky-blue perovskite light-emitting diodes”Nature Communications, DOI: 10.1038/s41467-018-05909-8 (2018)
4.G.K. Longet al., “Spin control in reduced-dimensional chiral perovskites”,Nature Photonics12, 528-533 (2018)
5.F. Yan,et al., “Highly efficient visible colloidal lead-halide perovskite nanocrystal light-emitting diodes”,Nano Lett.18, 3157-3164 (2018)
6.R. Suet al., “Room temperature polariton lasing in all-inorganic perovskite”,Nano Lett.17, 3982–3988 (2017)
7.Q. Zhang,et al., “High quality whispering-gallery-mode lasing from cesium lead halide perovskite nanoplatelets”,Adv. Funct. Mater. 26, 6238-6245 (2016)
8.Q. Zhang,et al., “Room-temperature near-infrared high-Q perovskite whispering-gallery planar nanolasers”,Nano Lett.14, 5995-6001 (2014)
報告人簡介：
熊啟華是南洋理工大學數理科學學院和電氣電子工程學院雙聘教授。美國物理學會會士。1997年本科畢業于武漢大學物理系，2000年從上海應用物理研究所獲得碩士學位，2006年于賓夕法尼亞州立大學獲得博士學位，師從Peter C. Eklund教授。2006-2009年在哈佛大學Charles Lieber研究組從事博士后研究。2009年初獲得新加坡國立研究基金研究員項目資助并于當年6月加入南洋理工大學，任南洋助理教授。2014年獲得終身教職，2016年升正教授。2014-2019年間擔任數理科學學院副院長。熊啟華教授的主要研究領域是以穩態和瞬態光譜學為主要實驗手段，以光和物質相互作用為研究主題,著重研究低維半導體納米材料基于光子-聲子-電子耦合作用的物理機制和量子調控。他在納米光子學和表面等離子體學，激光制冷，以及二維半導體材料光學性質等一系列前沿課題做出了一系列有影響的工作。在《自然》及子刊,《科學-進展》，《納米通訊》，《先進材料》等一系列國際知名雜志上發表了200多篇文章，并被世界知名雜志及大眾媒體所報道，總引用次數超過10000次，H-因子59。其出色的研究獲得了一些獎勵和認可，比如新加坡物理學會納米科技獎（2015），新加坡國立研究基金NRF Investigatorship獎（2014），和南洋理工大學南洋研究卓越獎（2014）等。2018年4月起，擔任美國光學學會旗艦雜志《Optics Express》副主編。2018年12月起，擔任Wiley信息材料領域新創刊雜志《InfoMat》的副主編。
