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Proceedings Paper

Spectroscopic photon localization microscopy: breaking the resolution limit of single molecule localization microscopy (Conference Presentation)
Author(s): Biqin Dong; Luay Matthew Almassalha; Ben E. Urban Jr.; The-Quyen Nguyen; Satya Khuon; Teng-Leong Chew; Vadim Backman; Cheng Sun; Hao F. Zhang

Paper Abstract

Distinguishing minute differences in spectroscopic signatures is crucial for revealing the fluorescence heterogeneity among fluorophores to achieve a high molecular specificity. Here we report spectroscopic photon localization microscopy (SPLM), a newly developed far-field spectroscopic imaging technique, to achieve nanoscopic resolution based on the principle of single-molecule localization microscopy while simultaneously uncovering the inherent molecular spectroscopic information associated with each stochastic event (Dong et al., Nature Communications 2016, in press). In SPLM, by using a slit-less monochromator, both the zero-order and the first-order diffractions from a grating were recorded simultaneously by an electron multiplying charge-coupled device to reveal the spatial distribution and the associated emission spectra of individual stochastic radiation events, respectively. As a result, the origins of photon emissions from different molecules can be identified according to their spectral differences with sub-nm spectral resolution, even when the molecules are within close proximity. With the newly developed algorithms including background subtraction and spectral overlap unmixing, we established and tested a method which can significantly extend the fundamental spatial resolution limit of single molecule localization microscopy by molecular discrimination through spectral regression. Taking advantage of this unique capability, we demonstrated improvement in spatial resolution of PALM/STORM up to ten fold with selected fluorophores. This technique can be readily adopted by other research groups to greatly enhance the optical resolution of single molecule localization microscopy without the need to modify their existing staining methods and protocols. This new resolving capability can potentially provide new insights into biological phenomena and enable significant research progress to be made in the life sciences.

Paper Details

Date Published: 24 April 2017
PDF: 1 pages
Proc. SPIE 10071, Single Molecule Spectroscopy and Superresolution Imaging X, 1007107 (24 April 2017); doi: 10.1117/12.2250214
Show Author Affiliations
Biqin Dong, Northwestern Univ. (United States)
Luay Matthew Almassalha, Northwestern Univ. (United States)
Ben E. Urban Jr., Northwestern Univ. (United States)
The-Quyen Nguyen, Northwestern Univ. (United States)
Satya Khuon, Howard Hughes Medical Institute (United States)
Teng-Leong Chew, Howard Hughes Medical Institute (United States)
Vadim Backman, Northwestern Univ. (United States)
Cheng Sun, Northwestern Univ. (United States)
Hao F. Zhang, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 10071:
Single Molecule Spectroscopy and Superresolution Imaging X
Jörg Enderlein; Ingo Gregor; Zygmunt Karol Gryczynski; Rainer Erdmann; Felix Koberling, Editor(s)

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