Wang Luojia, Gu Ying, Chen Hongyi, Zhang Jia-Yu, Cui Yiping, Gerardot Brian D, Gong Qihuang
State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China.
Sci Rep. 2013 Oct 7;3:2879. doi: 10.1038/srep02879.
Surface plasmons with ultrasmall optical mode volume and strong near field enhancement can be used to realize nanoscale light-matter interaction. Combining surface plasmons with the quantum system provides the possibility of nanoscale realization of important quantum optical phenomena, including the electromagnetically induced transparency (EIT), which has many applications in nonlinear quantum optics and quantum information processing. Here, using a custom-designed resonant plasmon nanocavity, we demonstrate polarized position-dependent linewidth-controllable EIT spectra at the nanoscale. We analytically obtain the double coherent population trapping conditions in a double-Λ quantum system with crossing damping, which give two transparent points in the EIT spectra. The linewidths of the three peaks are extremely sensitive to the level spacing of the excited states, the Rabi frequencies and detunings of pump fields, and the Purcell factors. In particular the linewidth of the central peak is exceptionally narrow. The hybrid system may have potential applications in ultra-compact plasmon-quantum devices.
具有超小光学模式体积和强近场增强的表面等离激元可用于实现纳米尺度的光与物质相互作用。将表面等离激元与量子系统相结合，为在纳米尺度实现重要的量子光学现象提供了可能，这些现象包括电磁诱导透明（EIT），其在非线性量子光学和量子信息处理中有许多应用。在此，我们使用定制设计的共振等离激元纳米腔，展示了纳米尺度下偏振位置依赖的线宽可控EIT光谱。我们通过分析得出了具有交叉阻尼的双Λ量子系统中的双相干布居俘获条件，这在EIT光谱中给出了两个透明点。三个峰的线宽对激发态的能级间距、泵浦场的拉比频率和失谐以及珀塞尔因子极为敏感。特别是中心峰的线宽异常狭窄。该混合系统可能在超紧凑等离激元 - 量子器件中具有潜在应用。
