The invention discloses a method for modulating a
gold nanorod optical section on a single
wavelength. The method for modulating the
gold nanorod optical section on the single
wavelength includes thefollowing steps that newly prepared AgNO<3> is added in a mixed liquid of CTAB and 5-
bromine salicylic acid, and anti-light standing is conducted; a HAuCl<4>.3H<2>O solution is added, and uniform stirring is conducted; an
ascorbic acid solution is added, stirring is conducted until the solution is colorless, and a growth liquid is obtained; the HAuCl<4>.3H<2>O solution is added in a mixed liquid of the CTAB and the 5-
bromine salicylic acid, and stirring is conducted; the
ascorbic acid solution is added, stirring is conducted until the solution is colorless, and a regrowth liquid is obtained; an original
seed crystal solution and the growth liquid are mixed and stirred, and standing is conducted until the color of the solution turns into purple;
centrifugation is conducted on the solution,gold nanorods are dispersed in the mixed liquid of the CTAB and the 5-
bromine salicylic acid, and a new
seed crystal solution is obtained; and the new
seed crystal solution and the regrowth liquid aremixed, the volume of the regrowth liquid and the concentration of the 5-bromine salicylic acid are adjusted, then the gold nanorods with the same wavelengths and different optical sections can be obtained. According to the method for modulating the
gold nanorod optical section on the single
wavelength, the operation is simple, the repetitive rate is high, and scattering and absorbing sections ofthe gold nanorods can be modulated on any single wavelength.