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Effective integration of highly-efficient focusing apodized grating and quantum dots on a solid substrate for scalable quantum photonic circuits

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Science China(Physics,Mechanics & Astronomy) 2024年

作者： Beimeng Yao Rongbin Su Shunfa Liu changkun song Ying Yu Jin Liu Xuehua Wang State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat-sen University State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen University

Recent advancements in quantum photonic circuits have significantly influenced the field of quantum information processing. The pursuit of an integrated quantum photonic circuit that offers an active, stable platform for large-scale integration and high processing efficiency remains a key objective. The grating coupler, as a crucial element for an efficient transformation output interface in the integrated quantum photonic circuits, presents significant potential for practical applications. Here, we demonstrate the integration block of a highly efficient shallow-etched focusing apodized grating coupler with indium arsenide(InAs) quantum dots(QDs) in gallium arsenide(GaAs) on a SiO2substrate for active quantum photonic circuits. The designed grating couplers possess a high efficiency over 90% in the broadband(900-930 nm) from the circuit to free space, and a nearly-perfect match with the fiber mode. Experimentally, the efficiency to free space reaches 81.8%, and the match degree with the fiber mode is high up to 92.1%. The proposed integration block offers the potential for large-scale integration of active quantum photonic circuits due to its stable solid substrate and highly performant output for quantum measurements.

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Single photon emitter deterministically coupled to a topological corner state

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Light(Science & Applications) 2024年第1期13卷 135-141页

作者： Mujie Rao Fulong Shi Zhixuan Rao Jiawei Yang changkun song Xiaodong Chen Jianwen Dong Ying Yu Siyuan Yu State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySchool of PhysicsSun Yat-Sen UniversityGuangzhou 510006China Hefei National Laboratory Hefei 230088China

Incorporating topological physics into the realm of quantum photonics holds the promise of developing quantum light emitters with inherent topological robustness and immunity to ***,the deterministic interaction of quantum emitters with topologically nontrivial resonances remains largely *** we present a single photon emitter that utilizes a single semiconductor quantum dot,deterministically coupled to a second-order topological corner state in a photonic crystal *** investigating the Purcell enhancement of both single photon count and emission rate within this topological cavity,we achieve an experimental Purcell factor of Fp=***,we demonstrate the on-demand emission of polarized single photons,with a second-order autocorrelation function g(2)(0)as low as 0.024±*** approach facilitates the customization of light-matter interactions in topologically nontrivial environments,thereby offering promising applications in the field of quantum photonics.

关键词： topological quantum deterministic

基于28 nm RRAM的可重构真随机数发生器

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浙江大学学报（工学版） 2024年第7期58卷 1516-1523页

作者：宋长坤郑彩萍陈铖颖厦门理工学院光电与通信工程学院福建厦门361024

基于阻变存储器(RRAM)电流饥饿型环形振荡器的真随机数发生器(TRNG)方案,提出交替读写的操作模式,优化熵源重构机制.针对现有RRAM在多操作周期下跨导线性化问题,提出熵可配置电阻窗口钳位电路.通过减小电阻窗口获得RRAM非线性的最大化,... 详细信息

基于阻变存储器(RRAM)电流饥饿型环形振荡器的真随机数发生器(TRNG)方案,提出交替读写的操作模式,优化熵源重构机制.针对现有RRAM在多操作周期下跨导线性化问题,提出熵可配置电阻窗口钳位电路.通过减小电阻窗口获得RRAM非线性的最大化,所提电路能够有效避免RRAM出现过度置位、过度复位的现象,保证熵源稳定性.基于UMC 28 nm HKMG工艺对TRNG进行流片.输出数据统计性测试结果通过了NIST SP800-22所有测试集的真随机数标准测试.检测结果表明,在高斯分布的95%置信区间,所有统计数据的自相关函数值均落在-0.003~0.003,输出序列具有良好的随机性.

关键词：阻变存储器(RRAM) 真随机数发生器(TRNG) 熵源电流饥饿型环形振荡器跨导线性

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基于OpenCV技术的智能盲杖设计与实现

河南科技 2024年第14期51卷 27-30页

作者：李政轩李杰翁一帆李永胜宋长坤郑州科技学院

【目的】以提升视障人士的生活质量和独立性，基于OpenCV技术开发一种创新的视障人士辅助装置——智能盲杖。【方法】通过摄像头实时采集环境图像，借助OpenCV技术进行图像处理和分析，并且融合了语音提示和导航功能，帮助视障人士更加... 详细信息

【目的】以提升视障人士的生活质量和独立性，基于OpenCV技术开发一种创新的视障人士辅助装置——智能盲杖。【方法】通过摄像头实时采集环境图像，借助OpenCV技术进行图像处理和分析，并且融合了语音提示和导航功能，帮助视障人士更加准确地定位和导航。【结果】研究结果表明，该装置可以成功辅助视障人士感知周围环境，并提供准确而及时的视觉信息。使用该装置后，视障人士展现出更高的独立性和安全性。【结论】基于OpenCV技术的视障人士辅助装置是一种创新、实用的设计，显著提高了视障人士的生活质量和日常行动能力。未来的研究方向包括优化硬件设计，提高系统的稳定性和耐用性，以及扩展语音提示和导航功能，以适应更多日常场景，从而为视障人士群体带来更广泛、更深远的益处。该设计对提升社会包容性和促进科技助力残障人士生活品质方面具有积极意义。

关键词：图像处理语音提示导航功能定位与导航

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Bright semiconductor single-photon sources pumped by heterogeneously integrated micropillar lasers with electrical injections

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Light(Science & Applications) 2023年第3期12卷 489-496页

作者： Xueshi Li Shunfa Liu Yuming Wei Jiantao Ma changkun song Ying Yu Rongbin Su Wei Geng Haiqiao Ni Hanqing Liu Xiangbin Su Zhichuan Niu You-ling Chen Jin Liu State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSchool of Electronics and Information TechnologySun Yat-sen University510275GuangzhouChina Hisilicon Research Huawei Technologies Co.Ltd518129ShenzhenChina State Key Laboratory for Superlattice and Microstructures State Key Laboratory on Integrated OptoelectronicsInstitute of SemiconductorsChinese Academy of Sciences100083BeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences100049BeijingChina

The emerging hybrid integrated quantum photonics combines the advantages of different functional components into a single chip to meet the stringent requirements for quantum information *** the tremendous progress in hybrid integrations of III-V quantum emitters with silicon-based photonic circuits and superconducting single-photon detectors,on-chip optical excitations of quantum emitters via miniaturized lasers towards single-photon sources(SPSs)with low power consumptions,small device footprints,and excellent coherence properties is highly desirable yet *** this work,we present realizations of bright semiconductor SPSs heterogeneously integrated with on-chip electrically-injected *** from previous one-by-one transfer printing technique implemented in hybrid quantum dot(QD)photonic devices,multiple deterministically coupled QD-circular Bragg Grating(CBG)SPSs were integrated with electrically-injected micropillar lasers at one time via a potentially scalable transfer printing process assisted by the wide-field photoluminescence(PL)imaging *** pumped by electrically-injected microlasers,pure single photons are generated with a high-brightness of a count rate of 3.8 M/s and an extraction efficiency of 25.44%.Such a high-brightness is due to the enhancement by the cavity mode of the CBG,which is confirmed by a Purcell factor of *** work provides a powerful tool for advancing hybrid integrated quantum photonics in general and boosts the developments for realizing highly-compact,energy-efficient and coherent SPSs in particular.

关键词： pumped quantum photon

Inter-facet composition modulation of III-nitride nanowires over pyramid textured Si substrates by stationary molecular beam epitaxy

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Nano Research 2021年第5期14卷 1502-1511页

作者： Peng Wang Hedong Chen Hao Wang Dan Wang changkun song Xingyu Wang Hongjie Yin Lujia Rao Guofu Zhou Richard Nötzel Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou510006China National Center for International Research on Green Optoelectronics South China Normal UniversityGuangzhou510006China Department of Physics Xiamen UniversityXiamen361005China Analysis&Testing Center South China Normal UniversityGuangzhou510631China Academy of Shenzhen Guohua Optoelectronics Shenzhen518110China

InGaN nanowires (NWs) are grown on pyramid textured Si substrates by stationary plasma-assisted molecular beam epitaxy (PA-MBE). The incidence angles of the highly directional source beams vary for different pyramid facets, inducing a distinct inter-facet modulation of the In content of the InGaN NWs, which is verified by spatial element distribution analysis. The resulting multi-wavelength emission is confirmed by photoluminescence (PL) and cathodoluminescence (CL). Pure GaN phase formation dominates on certain facets, which is attributed to extreme local growth conditions, such as low active N flux. On the same facets, InGaN NWs exhibit a morphology change close to the pyramid ridge, indicating inter-facet atom migration. This cross-talk effect due to inter-facet atom migration is verified by a decrease of the inter-facet In content modulation amplitude with shrinking pyramid size. A detailed analysis of the In content variation across individual pyramid facets and element distribution line profiles reveals that the cross-talk effect originates mainly from the inter-facet atom migration over the convex pyramid ridge facet boundaries rather than the concave base line facet boundaries. This is understood by first-principles calculations showing that the pyramid baseline facet boundary acts as an energy barrier for atom migration, which is much higher than that of the ridge facet boundary. The influence of the growth temperature on the inter-facet In content modulation is also presented. This work gives deep insight into the composition modulation for the realization of multi-color light-emitting devices based on the monolithic growth of InGaN NWs on pyramid textured Si substrates.

关键词： pyramid textured Si substrate composition modulation III-nitride nanowire molecular beam epitaxy stationary growth cross talk

InAs/GaAs自组织量子点的可控分子束外延生长及其新型光电器件研究

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真空科学与技术学报 2023年第3期43卷 210-218页

作者：陈英鑫黄晓莹杨灼辉钟汉城宋长坤刘林喻颖余思远中山大学电子与信息工程学院、光电材料与技术国家重点实验室广州510275

半导体量子点因其具有类原子的分立能级结构,可在三维方向上对载流子运动进行束缚,因此被认为是光发射器件(激光器、量子光源等)极具前景的有源物质之一。其器件的性能强烈依赖于量子点材料的品质、光场与量子点偶极子场的有效相互作用... 详细信息

半导体量子点因其具有类原子的分立能级结构,可在三维方向上对载流子运动进行束缚,因此被认为是光发射器件(激光器、量子光源等)极具前景的有源物质之一。其器件的性能强烈依赖于量子点材料的品质、光场与量子点偶极子场的有效相互作用等。本文将从半导体InAs/GaAs自组织量子点的可控分子束外延生长调控技术出发,进一步探讨应用于光通信、片上光互联领域的量子点激光器,以及应用于光量子信息领域的高品质量子光源器件。

关键词：半导体量子点半导体激光器量子光源

大学生职业目标的认识误区及其解决——基于岭南师范学院经管类学生的调查

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岭南师范学院学报 2016年第5期37卷 14-19页

作者：宋长琨岭南师范学院商学院广东湛江524048

职业目标是大学生对于自己未来所从事的行业、岗位和职位的设计和规划。调查显示,大学生对于职业目标存在三个方面的认识误区:其一,认为职业目标可有可无,忽视职业规划的重要性;其二,对于设立职业目标的理由不充分,职业目标成了无源之... 详细信息

职业目标是大学生对于自己未来所从事的行业、岗位和职位的设计和规划。调查显示,大学生对于职业目标存在三个方面的认识误区:其一,认为职业目标可有可无,忽视职业规划的重要性;其二,对于设立职业目标的理由不充分,职业目标成了无源之水、无本之木;其三,在目标设计上不够系统,总目标与分目标、大目标与小目标之间缺少密切的关联。对此,学校要加强教育,学生应增进理解,进而设计出科学、合理的职业目标,才能让大学生通过职业规划把自己的理想变成现实。

关键词：大学生职业生涯规划职业目标

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非易失性静态随机存储器研究进展

半导体技术 2022年第1期47卷 1-8,18页

作者：冯平尹家宇宋长坤余仕湖李伯阳陈铖颖左石凯厦门理工学院光电与通信工程学院福建厦门361024 厦门新声科技有限公司福建厦门361115

在非易失性存储器领域,非易失性静态随机存储器(NVSRAM)可以克服现有非易失性存储器的缺点与限制,并完全替代静态随机存储器(SRAM)。首先,对几种新型非易失性存储器进行了简单阐述;其次介绍了NVSRAM的基本工作原理和特点,针对NVSRAM在... 详细信息

在非易失性存储器领域,非易失性静态随机存储器(NVSRAM)可以克服现有非易失性存储器的缺点与限制,并完全替代静态随机存储器(SRAM)。首先,对几种新型非易失性存储器进行了简单阐述;其次介绍了NVSRAM的基本工作原理和特点,针对NVSRAM在解决传统SRAM掉电数据储存问题、加快读取速度以及减少功耗等方面的优势进行阐述。对近年来基于阻变存储器的NVSRAM的研究背景和国内外研究现状进行了调研,着重比较和分析了已有结构的优缺点,重点探讨了提高恢复率、减少漏电流和降低功耗的关键优化技术。最后,展望了NVSRAM未来的应用和研究发展方向。

关键词：非易失性静态随机存储器(SRAM) 恢复率漏电流功耗