Broadband single-molecule excitation spectroscopy

Lukasz Piatkowski (), Esther Gellings and Niek F. van Hulst ()
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Lukasz Piatkowski: ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
Esther Gellings: ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
Niek F. van Hulst: ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Over the past 25 years, single-molecule spectroscopy has developed into a widely used tool in multiple disciplines of science. The diversity of routinely recorded emission spectra does underpin the strength of the single-molecule approach in resolving the heterogeneity and dynamics, otherwise hidden in the ensemble. In early cryogenic studies single molecules were identified by their distinct excitation spectra, yet measuring excitation spectra at room temperature remains challenging. Here we present a broadband Fourier approach that allows rapid recording of excitation spectra of individual molecules under ambient conditions and that is robust against blinking and bleaching. Applying the method we show that the excitation spectra of individual molecules exhibit an extreme distribution of solvatochromic shifts and distinct spectral shapes. Importantly, we demonstrate that the sensitivity and speed of the broadband technique is comparable to that of emission spectroscopy putting both techniques side-by-side in single-molecule spectroscopy.

Date: 2016
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DOI: 10.1038/ncomms10411

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