Abstract
In the traditional long-range surface plasmon geometry, an ultrathin metal film is sandwiched between two layers having identical dielectric constants. Here we demonstrate the long-range surface plasmon polariton (LRSPP) properties for a new structure where a thin layer with a dielectric constant exceeding that of the surroundings is inserted within the sandwich, provided the layer thickness d satisfies the condition k⊥d = mπ where k⊥ is the component of the guide wavevector perpendicular to the layer and m is an integer. The resulting plasmon modes have smaller losses and nearly the same phase velocity as the original LRSPP. This provides a strategy to support silver films having thicknesses of 10's of nanometers to create plasmonic devices for sensor applications.
Original language | English (US) |
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Pages (from-to) | 4713-4715 |
Number of pages | 3 |
Journal | Optics Letters |
Volume | 36 |
Issue number | 23 |
DOIs | |
State | Published - Dec 1 2011 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics