2Fletcher D A,Goodson K E,Kino G S.Focusing in microlenses close to a wavelength in diameter[J].Optics Letters,2001,26(7):399-401.
3Yotnan B Y,Byron Gates,Yadong Yin,et al. Monodispersed colloidal spheres:old materials with new applications [J].Adavanced Materials,2000,12(10):693-713.