Optical trapping reveals differences in dielectric and optical properties of copper nanoparticles compared to their oxides and ferrites.

ABSTRACT: In a nanoplasmonic context, copper (Cu) is a potential and interesting surrogate to less accessible metals such as gold, silver or platinum. We demonstrate optical trapping of individual Cu nanoparticles with diameters between 25 and 70 nm and of two ionic Cu nanoparticle species, CuFe₂O₄ and CuZnFe₂O₄, with diameters of 90 nm using a near infrared laser and quantify their interaction with the electromagnetic field experimentally and theoretically. We find that, despite the similarity in size, the trapping stiffness and polarizability of the ferrites are significantly lower than those of Cu nanoparticles, thus inferring a different light-particle interaction. One challenge with using Cu nanoparticles in practice is that upon exposure to the norma

SUBMITTER: Purohit P 

PROVIDER: S-EPMC6985125 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature