Speaker
Description
By using a model interface consisting of a metallic grating and a zinc phthalocyanine (ZnPc) thin film, we temporally and spatially resolve the energy transfer process from plasmon to molecular exciton via the plasmon-induced resonance energy transfer (PIRET) mechanism. It is found that the energy transfer can occur within 30 fs for a distance of 20 nm. The energy transfer range is much larger than typical hot carrier transfer and exciton-to-exciton energy processes. Hence, this ultrafast and long-range energy transfer channel can be useful for boosting the exciton/free carrier generation yield in semiconductor layers that are optically thin. Moreover, the enhancement in the exciton production yield does not diminish even for photon energies that are below the optical bandgap of ZnPc. Therefore, the observed energy transfer process can effectively extent the optical absorption to frequencies below the optical bandgap.
| Talk Credit? | Yes |
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