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Design and fabrication of broadband ultralow reflectivity black Si surfaces by laser micro/nanoprocessing 被引量:21
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作者 Jing Yang fangfang luo +5 位作者 Tsung Sheng Kao Xiong Li Ghim Wei Ho Jinghua Teng Xiangang luo Minghui Hong 《Light(Science & Applications)》 SCIE EI CAS 2014年第1期147-154,共8页
Light collection efficiency is an important factor that affects the performance of many optical and optoelectronic devices.In these devices,the high reflectivity of interfaces can hinder efficient light collection.To ... Light collection efficiency is an important factor that affects the performance of many optical and optoelectronic devices.In these devices,the high reflectivity of interfaces can hinder efficient light collection.To minimize unwanted reflection,anti-reflection surfaces can be fabricated by micro/nanopatterning.In this paper,we investigate the fabrication of broadband anti-reflection Si surfaces by laser micro/nanoprocessing.Laser direct writing is applied to create microstructures on Si surfaces that reduce light reflection by light trapping.In addition,laser interference lithography and metal assisted chemical etching are adopted to fabricate the Si nanowire arrays.The anti-reflection performance is greatly improved by the high aspect ratio subwavelength structures,which create gradients of refractive index from the ambient air to the substrate.Furthermore,by decoration of the Si nanowires with metallic nanoparticles,surface plasmon resonance can be used to further control the broadband reflections,reducing the reflection to below 1.0%across from 300 to 1200 nm.An average reflection of 0.8%is achieved. 展开更多
关键词 ANTI-REFLECTION BROADBAND laser micro/nanoprocessing surface plasmons
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Power electronic transformer with adaptive PLL technique for voltage-disturbance ride through 被引量:7
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作者 Jianhua WANG fangfang luo +5 位作者 Qing DUAN Zhendong JI Binshi GU Jun YOU Wei GU Jianfeng ZHAO 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2018年第5期1090-1102,共13页
The power electronic transformer(PET) has recently emerged as a type of power converter. It features the basic functions of power conversion and isolation as well as additional functions related to power quality contr... The power electronic transformer(PET) has recently emerged as a type of power converter. It features the basic functions of power conversion and isolation as well as additional functions related to power quality control. A novel PET for a distribution grid called a flexible power distribution unit is proposed in this paper, and the energy exchange mechanism between the network and the load is revealed. A 30 kW 600 VAC/220 VAC/110 VDC medium-frequency isolated prototype is developed and demonstrated. This paper also presents key control strategies of the PET for electrical distribution grid applications,especially under grid voltage disturbance conditions.Moreover, stability issues related to the grid-connected three-phase PET are discussed and verified with an impedance-based analysis. The PET prototype is tested, and it passes the voltage-disturbance ride-through function. The experimental results verify the power quality control abilities of the PET. 展开更多
关键词 POWER electronic transformer Mediumfrequency isolation Voltage-disturbance RIDE THROUGH POWER quality Stability
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