Optics Laboratory, School of Engineering, Ecole Polytechnique Fédérale de Lausanne, BM 4.107, Station 17, CH-1015 Lausanne, Switzerland.
Phys Rev Lett. 2010 May 21;104(20):207402. doi: 10.1103/PhysRevLett.104.207402. Epub 2010 May 19.
A nonlinear optical plasmonic core-shell nanocavity is demonstrated as an efficient, subwavelength coherent light source through second-harmonic generation. The nonlinear optical plasmonic nanocavity incorporates a noncentrosymmetric medium, which utilizes the entire mode volume for even-order nonlinear optical processes. In previous plasmonic nanocavities, enhancement of such processes was only possible at the interface but symmetry prohibited in the body. We measured an enhancement of over 500 times in the second-harmonic radiation power. Calculations show that an enhancement of over 3500 times is achievable.
一个非线性光学等离子体芯壳纳米腔被证明是一个高效的亚波长相干光源，通过二次谐波产生。非线性光学等离子体纳米腔采用非中心对称介质，利用整个模式体积进行偶数阶非线性光学过程。在以前的等离子体纳米腔中，只有在界面处才能增强这些过程，但由于对称性，在体内是不可能的。我们测量到二次谐波辐射功率增强了 500 多倍。计算表明，增强倍数超过 3500 倍是可行的。
