Controllable optical activity of non-spherical Ag and Co SERS substrate with different magnetic field

Fan Chun-Zhen^{1, †}, Zhu Shuang-Mei^{1, 2}, Xin Hao-Yi¹

(color online) (a) and (b) TEM images of the prepared Co nanoparticles with different magnifications; (c) absorption spectrum of the non-spherical Ag colloid.