| 5 | Design of a micrometer-long superconducting nanowire perfect absorber for efficient high-speed single-photon detection显示文摘Despite very efficient superconducting nanowire single-photon detectors(SNSPDs)reported recently,combining their other performance advantages such as high speed and ultralow timing jitter in a single device still remains challenging.In this work,we present a perfect absorber model and the corresponding detector design based on a micrometer-long NbN nanowire integrated with a 2D photonic crystal cavity of ultrasmall mode volume,which promises simultaneous achievement of near-unity absorption,gigahertz counting rates,and broadband optical response with a 3 dB bandwidth of 71 nm.Compared to previous stand-alone meandered and waveguideintegrated SNSPDs,this perfect absorber design addresses the trade space in size,efficiency,speed,and bandwidth for realizing large on-chip single-photon detector arrays. | RISHENG CHENG SIHAO WANG CHANG-LING ZOU HONG X.TANG | 2020 | Photonics Research2020，8，8： | 0 |
| 6 | 在大井眼中用LWD声波测量来探测浅层钻井危险区显示文摘美国内务部,矿物管理服务(MMS)要求在潜在的浅层钻井危险区必须安装导管柱和表层套管。但在LWD测井确认出的安全区域MMS对使用导管柱和表层套管不作要求,且LWD代替电缆测井评估浅地层有明显优势。模型显示在纵波慢度接近钻井泥浆慢度时LWD可以测量出纵波慢度。在大井眼和超慢速地层,91/2in的LWD声波仪器采集浅层数据是非常合适的。因此钻井时,实时的LWD测井可以确证出该地层有没有浅层气藏,且被MMS接受。这样,在多井项目操作中,可以降低电缆项目的操作费用,也节省出拆卸导管柱和表层套管的费用,可以节约215万USD左右。 | 韩璐 J.Prilliman Derek Buster X.Tang 刘红岐 魏小龙 廖茂杰 杜玉荣 康志磊 | 2011 | 国外测井技术2011，31，1： | 0 |
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