Department of Physics, Texas Tech University, Lubbock, Texas 79409, USA. luis.grave‐de‐
Opt Lett. 2011 Jul 1;36(13):2516; discussion 2517. doi: 10.1364/OL.36.002516.
We comment on a recent paper [Opt. Lett.35, 1944 (2010)].
我们评论了最近的一篇论文[Opt. Lett.35, 1944 (2010)]。