Medium cont ains metal nanopart icles as m eta-mater ials

In recent years, meta-materi als have been studied because of attractive properties such as negative refractiv e index in especial incident wavelength [۱]. Generally, when electric permittivity and magnetic permeabilit y have neg ative valu es simultaneously, ne gative refractive index i s achieved [۲]. It is well known that electroma gnetic waves propagating in isotro pic Meta-m aterials possess seve ral peculiar characteristics, inclu ding anomalous refraction, revers al of both the Doppler shift and t he Cherenk ov radiation, and rever sal of radiation pressure to radiation tension. On the other hand, scattering and abso rption of lig ht by nanostructures is one of the physicists & chemists motivations .Historicall y, there are some soluti ons for light scattering problems in special case, lik e Rayleigh, Debye, Lorenz appro ximations a nd Mie's theory [۳]. Mi e could prop ose exact solution for light scattering of spherical nanoparticles by s olving of M axwell's eq uations in ۱۹۰۸ [۴]. Mie's theory was represented for isotropic, ho mogeneous and spherical particles into isotropic, homogeneous and non-absorbing surrounding medium s [۵]. In this work, we suggest that for s pecial wavelength and nanoparticle size, the eff ective refractive index shows negative value in Mie's theory and hence it could be considered a s meta-materials.

کلیدواژه ها:

Metal ، nanoparti cles ، Mie's t heory ، meta-materials