Long-range surface plasmon polaritons at THz frequencies in thin semiconductor layers
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摘要:
Surface plasmon polaritons (SPPs) are electromagnetic waves coupled to the free charge carriers at the interface between a metal and a dielectric[1].These waves propagate along the interface,while decaying evanescently away from it.The propagation length of SPPs is mainly limited by Ohmic losses in the metal.A possible way to lower these losses is to reduce the penetration of the electromagnetic field inside the metal,which can be achieved by coupling the SPPs at the opposite sides of a thin metallic film.These coupled SPPs are known as long-range surface plasmon polaritons (LRSPPs) and have been thoroughly investigated at optical frequencies in thin layers of noble metals[2].