Fluorescence Axial Localization with Nanometer Accuracy and Precision

Fluorescence Axial Localization with Nanometer Accuracy and Precision
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DOI:
10.1021/nl301542c
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发表时间:
2012-07-01
期刊:
影响因子:
10.8
通讯作者:
Sivasankar, Sanjeevi
Sivasankar, Sanjeevi
中科院分区:
材料科学1区
文献类型:
--
作者:
Li, Hui;Yen, Chi-Fu;Sivasankar, Sanjeevi

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我们描述了一种新的技术,驻波轴向纳米(SWAN),图像的轴向位置的一个单一的纳米级荧光物体与亚纳米精度和3.7纳米精度。一个驻波,通过定位在聚焦激光束的原子力显微镜尖端产生的,用于激发荧光;轴向位置确定从发射强度的相位。我们使用SWAN来测量不同长度的单个DNA分子的取向,这些分子接枝在具有不同功能的表面上。
We describe a new technique, standing wave axial nanometry (SWAN), to image the axial location of a single nanoscale fluorescent object with sub-nanometer accuracy and 3.7 nm precision. A standing wave, generated by positioning an atomic force microscope tip over a focused laser beam, is used to excite fluorescence; axial position is determined from the phase of the emission intensity. We use SWAN to measure the orientation of single DNA molecules of different lengths, grafted on surfaces with different functionalities.