Abstract
We have investigated the focusing properties of surface plasmon polariton floating dielectric lenses. An analysis of the scattering characteristics of surface plasmon polaritons using a floating dielectric block shows that the air-gap thickness between a floating dielectric block and a metal substrate can be an effective dynamic variable for modulating the amplitude and phase of the transmission coefficient of the surface plasmon polaritons. This property can be used to realize a variable-focusing surface plasmon dielectric lens with the air-gap thickness as the dynamic variable. The focusing properties of a Fresnel lens and a parabolic lens with respect to the air-gap thickness are compared and analyzed.
| Original language | English |
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| Pages (from-to) | 3049-3057 |
| Number of pages | 9 |
| Journal | Optics Express |
| Volume | 16 |
| Issue number | 5 |
| DOIs | |
| State | Published - 3 Mar 2008 |