Self-Interference of Exciton Emission in Organic Single Crystals Visualized by Energy-Momentum Spectroscopy | Zendy

Christian Schörner | Zendy; Sajedeh Motamen | Zendy; Laurent Simon | Zendy; Günter Reiter | Zendy; Richard Hildner | Zendy

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Self-Interference of Exciton Emission in Organic Single Crystals Visualized by Energy-Momentum Spectroscopy

Author(s) -

Christian Schörner,

Sajedeh Motamen,

Laurent Simon,

Günter Reiter,

Richard Hildner

Publication year - 2018

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.8b00811

Subject(s) - interference (communication) , spectroscopy , position and momentum space , anisotropy , materials science , molecular physics , exciton , momentum (technical analysis) , radiation , diffraction , laser , excitation , optics , chemistry , condensed matter physics , physics , channel (broadcasting) , finance , quantum mechanics , electrical engineering , economics , engineering

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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