Focusing of surface phonon polaritons
- 19 May 2008
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 92 (20)
- https://doi.org/10.1063/1.2930681
Abstract
Surface phonon polaritons (SPs) on crystal substrates have applications in microscopy, biosensing, and photonics. Here, we demonstrate focusing of SPs on a silicon carbide (SiC) crystal. A simple metal-film element is fabricated on the SiC sample in order to focus the surface waves. Pseudoheterodyne scanning near-field infrared microscopy is used to obtain amplitude and phase maps of the local fields verifying the enhanced amplitude in the focus. Simulations of this system are presented, based on a modified Huygens’ principle, which show good agreement with the experimental results.Keywords
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