arXiv 0804.24472008-04physics.optics

Ultrasmall volume Plasmons - yet with complete retardation effects

Eyal Feigenbaum, Meir Orenstein

备注：: 16 pages, 6 figures
发表信息：: Phys. Rev. Lett. 101 163902 (2008)
DOI：: 10.1103/PhysRevLett.101.163902

英文摘要：

Nano particle-plasmons are attributed to quasi-static oscillation with no wave propagation due to their subwavelength size. However, when located within a band-gap medium (even in air if the particle is small enough), the particle interfaces are acting as wave-mirrors, incurring small negative retardation. The latter when compensated by a respective (short) propagation within the particle substantiates a full-fledged resonator based on constructive interference. This unusual wave interference in the deep subwavelength regime (modal-volume<0.001lambda^3) significantly enhances the Q-factor, e.g. 50 compared to the quasi-static limit of 5.5.

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