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Updated: Jan 20, 2026
Atomic Emission Spectroscopy: Interference
Self-Interference of Exciton Emission in Organic Single Crystals Visualized by Energy-Momentum Spectroscopy
Christian Schörner1, Sajedeh Motamen2, Laurent Simon3
1Soft Matter Spectroscopy, University of Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany.
Abstract:
We employ energy-momentum spectroscopy on isolated organic single crystals with micrometer-sized dimensions. The single crystals are grown from a thiophene-based oligomer and are excellent low-loss active waveguides that support multiple guided modes. Excitation of the crystals with a diffraction-limited laser spot results in emission into guided modes as well as into quasi-discrete radiation modes. These radiation modes are mapped in energy-momentum space and give rise to dispersive interference patterns. On the basis of the known geometry of the crystals, especially the height, the characteristics of the interference maxima allow one to determine the energy dependence of two components of the anisotropic complex refractive index. Moreover, the method is suited to identify the orientation of molecules within (and around) a crystalline structure.
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