Nanophotonic energy up conversion using ZnO nanorod double-quantum-well structures

Yatsui, T.; Sangu, S.; Kobayashi, K.; Kawazoe, T.; Ohtsu, M.; Yoo, J.; Yi, G.-C.
February 2009
Applied Physics Letters;2/23/2009, Vol. 94 Issue 8, p083113
Academic Journal
We report on near-field spectroscopy of ZnO/ZnMgO nanorod double-quantum-well structures (DQWs) for a nanometer-scale photonic device. We observed energy up conversion assisted by the absorption of phonons generated in the ZnO nanorod DQWs. Theoretical calculation of the coherent excitonic excitation of the population with incoherent phonon coupling agrees well with the obtained experimental power dependence of the up conversion efficiency. It should result in an increase in the efficiency of devices, such as photodetectors, solar cells, and so on.


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