Posted August 26, 2016 by fismots in Research Results

Fano-like spectral profile in TE wave scattering by nanowire of dissipative and dispersive materials

Azrul_JNOPM
Azrul_JNOPM

We report the result of extending the study of Fano phenomena in the scattering of TE electromagnetic wave by nanowire having complex and dispersive permittivities, ε1(ω) = ε1′(ω) + iε1″(ω), on the basis of exact Mie formulation. It is shown that the spectral profiles of scattering coefficients are sensitively affected by imaginary part of the permittivity and its overall frequency dependent properties. The cascaded resonance profile reported previously for real and positive permittivity is suppressed by a large ε1″ while the spectral profile is broadened by the dispersive nature of ε1(ω) as to increase the asymmetry of the profile. The negative sign of the real part of the permittivity, except for ε1′ = −1, is generally found to eliminate the resonace profile. Further, the size (radius) of the nanowire is also shown to affect the resonance profile. Specific scattering coefficients calculated for silicon (Si) and silver (Ag) nanowire using experimental data of corresponding ε1(ω) are demonstrated to exhibit the spectral profile for certain wire sizes with nicely fitted Fano profile.

Principle Investigator : Alexander A. Iskandar
Funding: Penelitian Unggulan Perguruan Tinggi, Indonesian Ministry of Education and Culture (Contract No. 310q/I1.C01/PL/2015)

Journal of Nonlinear Optical Physics & Materials
Vol. 25, No. 1 (2016) 1650005
DOI: 10.1142/S0218863516500053