4.7 Article

Multidimensional electronic spectroscopy in high-definition-Combining spectral, temporal, and spatial resolutions

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JOURNAL OF CHEMICAL PHYSICS
卷 154, 期 23, 页码 -

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AMER INST PHYSICS
DOI: 10.1063/5.0052234

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资金

  1. Department of Atomic Energy, India [58/20/31/2019-BRNS]
  2. Science and Engineering Research Board, India [CRG/2019/003691, IPA/2020/000033]
  3. Infosys Foundation, Bangalore

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Coherent multidimensional spectroscopies have been implemented across different regions of the electromagnetic spectrum over the past two decades, providing new insights into molecular scale phenomena. Recent technological developments have enabled higher spatial resolution while addressing issues caused by ensemble averaging.
Over the past two decades, coherent multidimensional spectroscopies have been implemented across the terahertz, infrared, visible, and ultraviolet regions of the electromagnetic spectrum. A combination of coherent excitation of several resonances with few-cycle pulses, and spectral decongestion along multiple spectral dimensions, has enabled new insights into wide ranging molecular scale phenomena, such as energy and charge delocalization in natural and artificial light-harvesting systems, hydrogen bonding dynamics in monolayers, and strong light-matter couplings in Fabry-Perot cavities. However, measurements on ensembles have implied signal averaging over relevant details, such as morphological and energetic inhomogeneity, which are not rephased by the Fourier transform. Recent extension of these spectroscopies to provide diffraction-limited spatial resolution, while maintaining temporal and spectral information, has been exciting and has paved a way to address several challenging questions by going beyond ensemble averaging. The aim of this Perspective is to discuss the technological developments that have eventually enabled spatially resolved multidimensional electronic spectroscopies and highlight some of the very recent findings already made possible by introducing spatial resolution in a powerful spectroscopic tool. Published under an exclusive license by AIP Publishing.

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