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国家自然科学基金(11204209)

作品数:3 被引量:14H指数:2
相关作者:邢琼勇冯列峰王存达张国义李丁更多>>
相关机构:海南工商职业学院北京大学天津大学更多>>
发文基金:国家自然科学基金天津市自然科学基金更多>>
相关领域:电子电信机械工程更多>>

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Accurate dependences of spontaneous emission factor, lifetime, and photon lifetime on threshold current
2020年
Using the rate equation, several optical methods of characterizing the threshold of a laser diode(LD) were analyzed. The thresholds determined by all methods are consistent if the spontaneous-emission-coefficient(β) is small. If β>0.05, the thresholds obtained by different methods are different. Especially, for micro-nano LDs with a large β, these methods are starting to become inaccurate. However, the d^2S/dI^2-I is a relatively accurate method to characterize threshold of these LDs compared to other methods. The effects of the spontaneous-emission-lifetime(τsp) and the photon-lifetime(τp) on thresholds were analyzed. The exact functions between the threshold and the β, τsp and τp were obtained.
JIA Kai-pingZHANG LiangFENG Lie-feng
关键词:LIFETIMEPHOTONACCURATE
半导体GaN基蓝光发光二极管的精确电学特性被引量:8
2013年
对传统的电容-电压(C-V)、电流-电压(I-V)测量方法和我们自建的表征方法测量得到的蓝光发光二极管(LED)正向特性的结果做了详细的对比分析,发现传统测量方法得到的电学参量是不够精确的。但是传统C-V方法得到的表观电容以及我们自建方法得到的结电容在大电压和低频率下都表现出了明显的负值,该实验结果与经典肖克莱理论相冲突。此外,我们精确地得到了负的结电容以及结电导随电压和频率变化的经验表达式。这将为半导体二极管的正向电学特性的理论研究提供实验基础。
李杨冯列峰李丁王存达邢琼勇张国义
关键词:发光二极管(LED)负电容电导P-N结
Broadband achromatic polarization insensitive metalens over 950 nm bandwidth in the visible and near-infrared被引量:6
2022年
Metalenses are expected to play an increasingly important role in miniaturized and integrated optical imaging components/systems.However,devising broadband achromatic metalenses with high focusing efficiencies is still quite challenging.In this work,we proposed an aperture-shared partition phase cooperative manipulation approach for designing a highefficiency broadband achromatic metalens composed of two concentric sub-metalenses.As a proof-of-concept,an achromatic polarization-independent metalens is successfully designed for the visible and near-infrared range from450 nm to 1400 nm with the focusing efficiency over 70% for the wavelength range of 600 nm to 1400 nm.The approach reported here provides a possibility for designing a high-performance metalens,which has great potential applications in integrated optics.
Peng SunMengdie ZhangFengliang DongLiefeng FengWeiguo Chu
关键词:BROADBAND
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