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Updated: Apr 5, 2026

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
Spectroscopic Study of Anisotropic Excitons in Single Crystal Hexacene
Alexey Chernikov1, Omer Yaffe1, Bharat Kumar2
1†Departments of Physics and Electrical Engineering, Columbia University, New York, New York 10027, United States.
Abstract:
The linear optical response of hexacene single crystals over a spectral range of 1.3-1.9 eV was studied using polarization-resolved reflectance spectroscopy at cryogenic temperatures. We observe strong polarization anisotropy for all optical transitions. Pronounced deviations from the single-molecule, solution-phase spectra are present, with a measured Davydov splitting of 180 meV, indicating strong intermolecular coupling. The energies and oscillator strengths of the relevant optical transitions and polarization-dependent absorption coefficients are extracted from quantitative analysis of the data.
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