| Polariton |
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| condensed matter physics | |
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In Physics , polaritons are Quasiparticle s resulting from strong coupling of Electromagnetic Wave s with an electric or magnetic Dipole -carrying excitation. They are an expression of the common Quantum phenomenon known as Level Repulsion , also known as the Anti-crossing principle. Polaritons describe the crossing of the Dispersion of light with any interacting Resonance . Thus, a polariton is the result of the mixing of a Photon with an excitation of a material. The most discussed types of polaritons are phonon-polaritons, resulting from coupling of an Infrared photon with a Phonon ; '''exciton-polaritons''', resulting from coupling of Visible light with an Exciton ; and '''surface plasmon-polaritons''', resulting from coupling of Surface Plasmon s with light (the wavelength depends on the substance). Whenever the polariton picture is valid, the model of photons in crystals is insufficient. A major feature of polaritons is a strong dependency of the propagation speed of light through the crystal on the Frequency . For exciton-polaritons, rich experimental results on various aspects have been gained in Copper (I) Oxide . REFERENCES SEE ALSO Polaritonics |
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