Compressed Sensing for Reconstructing Coherent Multidimensional Spectra

Zhengjun Wang, Shiwen Lei, Khadga Jung Karki*, Andreas Jakobsson, Tönu Pullerits

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We apply two sparse reconstruction techniques, the least absolute shrinkage and selection operator (LASSO) and the sparse exponential mode analysis (SEMA), to two-dimensional (2D) spectroscopy. The algorithms are first tested on model data, showing that both are able to reconstruct the spectra using only a fraction of the data required by the traditional Fourier-based estimator. Through the analysis of the sparsely sampled experimental fluorescence-detected 2D spectra of LH2 complexes, we conclude that both SEMA and LASSO can be used to significantly reduce the required data, still allowing one to reconstruct the multidimensional spectra. Of the two techniques, it is shown that SEMA offers preferable performance, providing more accurate estimation of the spectral line widths and their positions. Furthermore, SEMA allows for off-grid components, enabling the use of a much smaller dictionary than that of the LASSO, thereby improving both the performance and the lowering of the computational complexity for reconstructing coherent multidimensional spectra.

Original languageEnglish
Pages (from-to)1861-1866
Number of pages6
JournalJournal of Physical Chemistry A
Volume124
Issue number9
DOIs
StatePublished - 5 Mar 2020
Externally publishedYes

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