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We have applied photoexcitation by ultrashort laser pulses to single crystal thin CrO(2) films to trigger coherent transient magnetization rotation on a subnanosecond time scale, in macroscale single domains. Moreover, by applying the photoexcitation by pairs of temporally separated pump pulses, the transient precession of the magnetization can be phase controlled, depending on the time separation between the pulses. The mechanism behind the photoexcitation originates from the modulation of the magnetocrystalline anisotropy by nonthermal hot electron spins. 相似文献
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Thin films of polyelectrolyte/J aggregate dye bilayers with high absorption coefficient (6 nm thick with alpha approximately equal to 1.0 x 10(6) cm(-1)) inserted in an optical microcavity enable the cavity quantum electrodynamic strong coupling limit to be reached at room temperature with a coupling strength (Rabi splitting) of 265 +/- 15 meV. By embedding these films in a resonant cavity organic LED structure, we demonstrate the first emissive electrically pumped exciton-polariton device. 相似文献
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H. Harde H. Burggraf H. W. K. Tom R. K. Jain P. B. Corkum R. S. Taylor Th. Sizer II J. D. Kafka C. Gable G. Mourou D. H. Auston P. R. Smith S. Williamson R. Trebino A. E. Siegman J. Kuhl J. H. Harris S. Sugai A. V. Nurmikko M. G. Li Veerendra K. Mathur Chi H. Lee M. Hasselbach S. C. Hsu H. S. Kwok 《Applied physics. B, Lasers and optics》1982,28(2-3):246-254