Propagation of the electromagnetic field in fully coated near-field optical probes

Vaccaro, L.; Aeschimann, L.; Staufer, U.; Herzig, H. P.; Dändliker, R.
July 2003
Applied Physics Letters;7/21/2003, Vol. 83 Issue 3, p584
Academic Journal
Fully metal-coated near-field optical probes, based on a cantilever design, have been studied theoretically and experimentally. Numerical simulations prove that these structures allow nonzero modal emission of the electromagnetic field through a 60-nm-thick metallic layer, that is opaque when deposited on flat substrates. The far-field intensity patterns recorded experimentally correspond to the ones calculated for the fundamental and first excited LP modes. Moreover, this study demonstrates that a high confinement of the electromagnetic energy can be reached in the near-field, when illuminated with radially polarized light. Finally, it was verified that the confinement of the field depends on the volume of the probe apex.


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