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
中科院分区:
文献类型:
--
作者:
Li, Hui;Yen, Chi-Fu;Sivasankar, Sanjeevi
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.