10 September 2007 Progress in developing nanophotonic devices driven by an optical near-field
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We review recent progress in the development of nanophotonic devices using the optical near-field interaction. ZnO nanocrystallites are potentially ideal components for realizing room-temperature operation of such devices due to their high exciton-binding energy and great oscillator strength. To confirm this promising optical property of ZnO, we examined the near-field time-resolved spectroscopy of ZnO nanorod double-quantum-well structures (DQWs). First, we observed the nutation of the population between the resonantly coupled exciton states of DQWs, in which the coupling strength of the near-field interaction was found to decrease exponentially as the separation increased. Furthermore, we successfully demonstrated the switching dynamics of a dipole-forbidden optical energy transfer among resonant exciton states. Our results provide criteria for designing nanophotonic devices. The success of time-resolved near-field spectroscopy of isolated DQWs described here is a promising step toward realizing a practical nanometer-scale photonic switch and related devices.
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Takashi Yatsui, Takashi Yatsui, Gyu-Chul Yi, Gyu-Chul Yi, Motoichi Ohtsu, Motoichi Ohtsu, } "Progress in developing nanophotonic devices driven by an optical near-field", Proc. SPIE 6779, Nanophotonics for Communication: Materials, Devices, and Systems IV, 677906 (10 September 2007); doi: 10.1117/12.731932; https://doi.org/10.1117/12.731932

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