Beilstein J. Nanotechnol.2011,2, 448–458, doi:10.3762/bjnano.2.49
can be utilized in experiments requiring light confinement.
Keywords: nanosphere-lithography; near-field enhancement; plasma etching; soft-lithography; surfaceplasmons; Introduction
Classical electromagnetic theories describing optical transmission through small apertures [1][2] do not take into
account the role of surfaceplasmons on metal films. In contrast to the predictions of these theories, enhanced optical transmission (EOT) was found for arrays of holes in metal films [3]. The transmission enhancements were attributed to the surfaceplasmons excited in the array [4]. This discovery
triggered extensive research on nanostructures that support surfaceplasmons, namely, nanocavities on metal films, arrays of interacting metal particles and gratings. The coupling between light and localized surfaceplasmons on metal nanostructures that have been favorably tailored leads to a variety of
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Figure 1:
Fabrication of arrays of metal film coated hemispheres. Main steps: (a) Preparation of 2D colloidal...