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飞秒时间分辨近场光学系统实现及其应用
  • ISSN号：1000-3290
  • 期刊名称：《物理学报》
  • 时间：0
  • 分类：TN247[电子电信—物理电子学]
  • 作者机构：[1]北京大学物理系,人工微结构和介观物理国家重点实验室,北京100871
  • 相关基金：国家自然科学基金（批准号：10434020,10521002）和国家重点基础研究发展计划（973）项目（批准号：2007cB307001）资助的课题
作者： 李智[1], 张家森[1], 杨景[1], 龚旗煌[1]
关键词： 飞秒近场, 扫描近场光学显微镜, 飞秒光脉冲, 金纳米颗粒, femtosecond-SNOM, scanning near-field optical microscope （SNOM）, femtosecond laser, gold nanoparticle
中文摘要：

结合飞秒光脉冲和近场光学显微镜，成功实现了飞秒时间分辨近场光学系统．系统通过高频声光调制和差频锁相探测，极大提高了信噪比并消除了抽运、探测光本底信号，从而在收集模式下测得了飞秒时间分辨的透射光微弱信号变化．同时获得了80nm的空间分辨和小于200fs的时间分辨测量．利用该实验系统，研究了金纳米结构的热电子弛豫动力学过程，观察到不同位置间热电子弛豫动力学的差异．

英文摘要：

By combining femtosecond laser with the scanning near-field optical microscope （ SNOM）, we have successfully realized the femtosecond-resolved near-field optical system. Through high frequency acousto-optic modulation and difference frequency lock-in detection, the signal-to-noise ratio was greatly improved and the background signals of the pump and probe light were removed. Therefore, we can measure a femtosecond-resolved weak transmission change in the collection mode SNOM. Spatial resolution of 80 nm and temporal resolution better than 200 fs were achieved simultaneously. Using this system, we studied the relaxation processes of hot electrons in gold nanostrucures and the difference in relaxation dynamics was observed at different sample positions.

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期刊信息
  • 《物理学报》
  • 北大核心期刊（2011版）
  • 主管单位:中国科学院
  • 主办单位:中国物理学会 中国科学院物理研究所
  • 主编：欧阳钟灿
  • 地址：北京603信箱(中国科学院物理研究所)
  • 邮编：100190
  • 邮箱：apsoffice@iphy.ac.cn
  • 电话：010-82649026
  • 国际标准刊号：ISSN：1000-3290
  • 国内统一刊号：ISSN：11-1958/O4
  • 邮发代号:2-425
  • 获奖情况:
  • 1999年首届国家期刊奖,2000年中科院优秀期刊特等奖,2001年科技期刊最高方阵队双高期刊居中国期刊第12位
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  • 被引量:49876