Scanning interferometric microscopy for the detection of ultrasmall phase shifts in condensed matter
Scanning interferometric microscopy for the detection of ultrasmall phase shifts in condensed matter
复制标题
扫描干涉显微镜用于检测凝聚态物质中的超小相移
DOI：
10.1103/physreva.73.021802
复制
发表时间：
2006
影响因子：
2.9
通讯作者：
W. Moerner
中科院分区：
文献类型：
--
作者：
Jaesuk Hwang;M. Fejer;W. Moerner
本文介绍了一种基于偏振Sagnac干涉法测量超微小相移的扫描光学显微镜，并用这种方法检测固体中的少量吸收分子，而不使用荧光。对-三联苯主体晶体中三苯分子的吸收和伴随的光学相移与样品的周期性光学饱和有关。在0.078美元的模体带宽下获得了$8.75\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}\phantom{\rule{0.3em}{0ex}}\mathrm{rad}$的探测灵敏度，在室温下可以探测到低至19美元的聚丙撑分子的信号。
We describe a scanning optical microscope based on polarization Sagnac interferometry for measuring ultrasmall phase shifts, and use this method to detect small numbers of absorbing molecules in a solid without the use of fluorescence. The absorption and concomitant optical phase shift of terrylene dopant molecules in a $p$-terphenyl host crystal are made time dependent by periodic optical saturation of the sample. A detection sensitivity of $8.75\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}\phantom{\rule{0.3em}{0ex}}\mathrm{rad}$ is achieved with a $0.078\phantom{\rule{0.3em}{0ex}}\mathrm{Hz}$ bandwidth, and detection of signals from as few as $19\ifmmode\pm\else\textpm\fi{}3$ terrylene molecules is demonstrated at room temperature.