Plasmonic nano-resonator enhanced one-photon luminescence from single   gold nanorods
  Strong Stokes and anti-Stokes one-photon luminescence from single gold nanorods is measured in experiments. It is found that the intensity and polarization of the Stokes and anti-Stokes emissions are in strong correlation. Our experimental observation discovered a coherent process in light emission from single gold nanorods. We present a theoretical mode, based on the concept of cavity resonance, for consistently understanding both Stokes and anti-Stokes photoluminescence. Our theory is in good agreement of all our measurements. 
Keyu Xia, Yingbo He, Hongming Shen, Yuqing Cheng, Qihuang Gong, Guowei   Lu
cond-mat.mes-hall physics.optics