Z. Wang, Xu, X., Fan, D., Wang, Y., and Chen, R. T., “High quality factor subwavelength grating waveguide micro-ring resonator based on trapezoidal silicon pillars,” Optics Letters, vol. 41, no. 14, pp. 3375-3378, 2016. Publisher's VersionAbstract
Subwavelength grating waveguide-based micro-ring resonators (SWGMRs) are a promising platform for research in light–matter interaction. However, it is extremely difficult to achieve small radius SWGMR devices (e.g., 5 μm) with satisfying quality factors (e.g., ∼10,000). One major issue is the large bend loss of small radius SWGMRs. In this work, we report the use of trapezoidal silicon pillars instead of conventional rectangular silicon pillars as building blocks of SWGMRs. We found that an asymmetric effective refractive index profile created by trapezoidal silicon pillars can significantly reduce the bend loss and therefore increase the quality factors of SWGMRs. For the first time to the best of our knowledge, we have experimentally demonstrated a 5 μm radius SWGMR made of trapezoidal silicon pillars (T-SWGMR) with an applicable quality factor as high as 11,500, 4.6 times of that (∼2800) offered by a conventional SWGMR made of rectangular silicon pillars, which indicates an 81.4% reduction of the propagation loss. This approach can also be readily employed to enhance SWGMRs with larger radii. We have also experimentally demonstrated a 10 μm radius T-SWGMR with a quality factor as high as 45,000, which indicates a propagation loss as low as 6.07 dB/cm.
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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
Y. Wang, Qiu, B., McGaughey, A. J. H., Ruan, X., and Xu, X., “Mode-Wise Thermal Conductivity of Bismuth Telluride,” J. of Heat Transfer, vol. 135, pp. 091102 , 2013.PDF icon PDF
Y. Wang and Xu, X., “Molecular dynamics studies of ultrafast laser-induced nonthermal melting,” Appl. Phys. A, vol. 110, pp. 617, 2012.PDF icon PDF
C. Yang, Wang, Y., and Xu, X., “Molecular dynamics studies of ultrafast laser-induced phase and structural change,” International Journal of Heat and Mass Transfer, vol. 55, pp. 6060–6066, 2012.PDF icon PDF
Y. Wang, Yu, X., and Venkatasubramanian, R., “Acoustic Phonon Scattering in Bi2Te3 /Sb2Te3 Superlattices,” Appl. Phys. Lett., vol. 97, pp. 083103, 2010.PDF icon PDF
C. M. Liebig, Wang, Y., and Xu, X., “Controlling Phase Change Using Femtosecond Photo-Excited Coherent Phonons,” Optics Express, vol. 18, pp. 20498, 2010.PDF icon PDF
Y. Wang, Xu, X., and Yang, J., “Resonant Oscillation of Misch-Metal Atoms in Filled Skutterudites,” Phys. Rev. Let, vol. 102, pp. 175508, 2009.PDF icon PDF
Y. Wang, Xu, X., and Zheng, L., “Molecular Dynamics Simulation of Ultrafast Photo Ablation of Fused Silica Film,” Appl. Phys. A, vol. 92, pp. 849, 2008.PDF icon PDF
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
K. Kuang, Y.Wang,, Huang, X., and Liao, G., “Experimental Study on Fire Suppression Effectiveness of Superfine and Surface Treatment Powder. J. Safety & Environment,” J. Safety & Environment, vol. 6, pp. 115, 2006.