Spectral representation of the Casimir Force Between a Sphere and a Substrate
C. E. Román-Velázquez, Cecilia Noguez, C. Villarreal, R. esquivel-Sirvent
Abstract
We calculate the Casimir force in the non-retarded limit between a spherical nanoparticle and a substrate, and we found that high-multipolar contributions are very important when the sphere is very close to the substrate. We show that the highly inhomegenous electromagnetic field induced by the presence of the substrate, can enhance the Casimir force by orders of magnitude, compared with the classical dipolar approximation.
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