W. Wu and Wang, Y., “

Ultrafast carrier dynamics and coherent acoustic phonons in bulk CdSe

,” Optics Letters, vol. 40, no. 1, pp. 64-67, 2015. Publisher's VersionAbstract
The femtosecond pump-probe technique is used to study the dynamics of photoexcited carriers and coherent acoustic phonons in bulk CdSe semiconductor. A turning point from fast to slow decay is observed, whose amplitude decreases with pump fluences and eventually flips the sign of differential reflectivity. The maximum change of differential reflectivity shows a saturation at high pump fluences, which is attributed to the optical energy gap dependent on carrier density. Long-lasting coherent oscillations of acoustic phonons have also been detected, and their amplitude and lifetime have a strong dependence on pump fluences. Our results can facilitate the understanding of ultrafast carrier and phonon dynamics in CdSe nanocrystals.
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J. Covey, Finke, A. D., Xu, X., Wu, W., Wang, Y., Diederich, F., and Chen, R. T., “

All-optical switching with 1-ps response time in a DDMEBT enabled silicon grating coupler/resonator hybrid device

,” OPTICS EXPRESS, vol. 22, no. 20, pp. 24532, 2014. Publisher's VersionPDF icon PDF
Y. Zhang and Wang, Y., “

The Effect of Coherent Optical Phonon on Thermal Transport

,” Appl. Phys. A, 2014.PDF icon PDF
Y. Wang, Guo, L., Xu, X., Pierce, J., and Venkatasubramanian, R. a, “The Origin of Coherent Phonons in Bi2Te3 Excited by Ultrafast Laser Pulses,” Phys. Rev. B, vol. 88, pp. 064307 , 2013.PDF icon PDF
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Y. Wang, Xu, X., and Venkatasubramanian, R., “Reduction in Coherent Phonon Life Time in Bi2Te3 /Sb2Te3 Superlattices,” Appl. Phys. Lett., vol. 93, pp. 113114, 2008.PDF icon PDF
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