Vaccaro, L.Aeschimann, L.Staufer, U.Herzig, H. P.Dändliker, R.2009-05-122009-05-122009-05-12200310.1063/1.1594288https://infoscience.epfl.ch/handle/20.500.14299/39962The propagation of the electromagnetic field in fully coated near field optical probes was analyzed. It was proved that these structures allow nonzero modal emission of the electromagnetic field through a 60-nm thick metallic layer. It was also found that a high confinement of the electromagnetic energy can be reached in the near field, when illuminated with radially polarized light.text::journal::journal article::research article