Low-threshold surface-emitting colloidal quantum-dot circular Bragg laser array  

作　　者：Yangzhi Tan Yitong Huang Dan Wu Yunjun Wang Xiao Wei Sun Hoi Wai Choi Kai Wang 

机构地区：[1]State Key Laboratory of Optical Fiber and Cable Manufacture Technology,Institute of Nanoscience and Applications,Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,China [2]Department of Electrical and Electronic Engineering,The University of Hong Kong,Hong Kong,China [3]College of New Materials and New Energies,Shenzhen Technology University,Shenzhen,China [4]Suzhou Xingshuo Nanotech Co.,Ltd.(Mesolight),Suzhou,China

出　　处：《Light(Science & Applications)》2025年第1期238-248,共11页光(科学与应用)(英文版)

基　　金：supported by the National Natural Science Foundation of China(no.62122034);National Key Research and Development Program of China(no.2022YFB3606504,and 2022YFB3602903);Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting(no.2017KSYS007);Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting(no.ZDSYS201707281632549);Shenzhen Key Laboratory of Applied Technologies of Super-Diamond and Functional Crystals(no.ZDSYS20230626091303007);Shenzhen Stable Support Research Foundation(no.20220717215521001);Shenzhen Science and Technology Program(no.JCYJ20220818100411025);High Level of Special Funds from Southern University of Science and Technology(no.G030230001 and no.G03034K002).

摘　　要：Colloidal quantum dots(CQDs)are attractive gain media due to their wavelength-tunability and low optical gain threshold.Consequently,CQD lasers,especially the surface-emitting ones,are promising candidates for display,sensing and communication.However,it remains challenging to achieve a low-threshold surface-emitting CQD laser array with high stability and integration density.For this purpose,it is necessary to combine the improvement of CQD material and laser cavity.Here,we have developed high-quality CQD material with core/interlayer/graded shell structure to achieve a low gain threshold and high stability.Subsequently,surface-emitting lasers based on CQD-integrated circular Bragg resonator(CBR)have been achieved,wherein the near-unity mode confinement factor(Γof 89%)and high Purcell factor of 22.7 attributed to the strong field confinement of CBR enable a low lasing threshold of 17μJ cm^(-2),which is 70%lower than that(56μJ cm^(-2))of CQD vertical-cavity surface-emitting laser.Benefiting from the high quality of CQD material and laser cavity,the CQD CBR laser is capable of continuous stable operation for 1000 hours(corresponding to 3.63×10^(8)pulses)at room temperature.This performance is the best among solution-processed lasers composed of nanocrystals.Moreover,the miniaturized mode volume in CBR allows the integration of CQD lasers with an unprecedentedly high density above 2100 pixels per inch.Overall,the proposed low-threshold,stable and compactly integrated CQD CBR laser array would advance the development of CQD laser for practical applications.

关 键 词：resonator CIRCULAR surface 

分 类 号：TN248[电子电信—物理电子学]