Resonance excitation of polaritons and plasmons at the interface between a uniaxial crystal and a metal
- Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)
A resonance is theoretically predicted in which a plane electromagnetic wave in a transparent optically uniaxial crystal, reflected from its metallized surface, creates a wave field at the interface whose intensity is considerably higher than the intensity of the incident wave. In the crystal, a high-intensity (bulk or surface) polariton is excited, whereas, in the metal, a large-amplitude localized plasmon is excited. The structure of the fields created in the crystal is close to that of the fields of bulk polaritons at the boundary with a perfectly conducting surface. The nonideality of the metal is taken into account in the Leontovich impedance approximation. Conditions are found under which the resonance is accompanied by a full transformation of the incident wave into a polariton-plasmon localized near the interface. This coupled wave can be considered as a pumped eigenmode. The intensity of the wave field localized at the boundary can amount to 10-15 times the intensity of the incident wave in the visible range. The resonance half-width with respect to the angles of incidence amounts to a few degrees. In the infrared range, the excitation factor can be an order of magnitude higher, while the resonance half-width sharply decreases down to about 0.1{sup o} for a wavelength of 5 {mu}m. Conditions are obtained for the resonance excitation of high-intensity bulk polaritons that arise as reflected modes propagating at a small angle to the boundary. The phenomena investigated are completely attributed to the anisotropy of the crystal.
- OSTI ID:
- 21443370
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 111, Issue 4; Other Information: DOI: 10.1134/S1063776110100109; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMPLITUDES
ANISOTROPY
APPROXIMATIONS
CRYSTALS
ELECTROMAGNETIC RADIATION
EXCITATION
IMPEDANCE
INCIDENCE ANGLE
INTERFACES
METALS
PLASMONS
POLARONS
RESONANCE
SURFACES
CALCULATION METHODS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
QUASI PARTICLES
RADIATIONS