Ultralong‐Range Energy Transport in a Disordered Organic Semiconductor at Room Temperature Via Coherent Exciton‐Polariton Propagation
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- Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 USA
- Department of Physics City College of New York City University of New York New York NY 10031 USA
- Department of Physics University of Michigan Ann Arbor MI 48109 USA
- Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 USA, Department of Physics University of Michigan Ann Arbor MI 48109 USA, Department of Materials Science and Engineering University of Michigan Ann Arbor MI 48109 USA
Abstract Amorphous molecular solids are inherently disordered, exhibiting strong exciton localization. Optical microcavities containing such disordered excitonic materials have been theoretically shown to support both propagating and localized exciton‐polariton modes. Here, the ultrastrong coupling of a Bloch surface wave photon and molecular excitons in a disordered organic thin film at room temperature is demonstrated, where the major fraction of the polaritons are propagating states. The delocalized exciton‐polariton has a group velocity as high as 3 × 10 7 m s –1 and a lifetime of 500 fs, leading to propagation distances of over 100 µm from the excitation source. The polariton intensity shows a halo‐like pattern that is due to self‐interference of the polariton mode, from which a coherence length of 20 µm is derived and is correlated with phase breaking by polariton scattering. The demonstration of ultralong‐range exciton‐polariton transport at room temperature promises new photonic and optoelectronic applications such as efficient energy transfer in disordered condensed matter systems.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1631487
- Journal Information:
- Advanced Materials, Journal Name: Advanced Materials Vol. 32 Journal Issue: 28; ISSN 0935-9648
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
Web of Science
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