TY - JOUR
T1 - Optical response of dielectric&metal-core/metal-shell nanoparticles
T2 - Near electromagnetic field and resonance frequencies
AU - Rocha-Rocha, O.
AU - Gaste´lum-Acun˜a, S.
AU - Flores-Acosta, M.
AU - Garc´ıa-Llamas, R.
N1 - Publisher Copyright:
© 2022
PY - 2022/5
Y1 - 2022/5
N2 - We study the diffraction of a monochromatic electromagnetic plane wave by a dielectric&metal-core/metal-shell nanoparticle surrounded by a dielectric medium. This problem was solved by using generalized Mie’s theory and both the scattering cross section and the square module of the electric field were calculated as a function of shell thickness. Numerically, the first particles studied were gold-core/silver-shell nanoparticles and their inverse configuration. The gold-core/silver-shell particle presented more variation of their optical properties. The second particles were vacuum-core/metal-shell surrounded by vacuum, symmetric configurations. In this case, the dispersive Drude dielectric function for the metal was used, and a comparative study between the positions of the resonance frequencies obtained from quasi-static limit and electrodynamic theory was performed. Thus, consequently the formula obtained from the quasi-static limit can be used to calculate the positions of the resonance frequencies instead of the electrodynamic theory, when the external radius is smaller than 20 nm.
AB - We study the diffraction of a monochromatic electromagnetic plane wave by a dielectric&metal-core/metal-shell nanoparticle surrounded by a dielectric medium. This problem was solved by using generalized Mie’s theory and both the scattering cross section and the square module of the electric field were calculated as a function of shell thickness. Numerically, the first particles studied were gold-core/silver-shell nanoparticles and their inverse configuration. The gold-core/silver-shell particle presented more variation of their optical properties. The second particles were vacuum-core/metal-shell surrounded by vacuum, symmetric configurations. In this case, the dispersive Drude dielectric function for the metal was used, and a comparative study between the positions of the resonance frequencies obtained from quasi-static limit and electrodynamic theory was performed. Thus, consequently the formula obtained from the quasi-static limit can be used to calculate the positions of the resonance frequencies instead of the electrodynamic theory, when the external radius is smaller than 20 nm.
KW - Core/shell nanoparticle
KW - quasi-static limit
KW - resonance frequencies
KW - scattering cross section
UR - http://www.scopus.com/inward/record.url?scp=85132667778&partnerID=8YFLogxK
U2 - 10.31349/REVMEXFIS.68.031302
DO - 10.31349/REVMEXFIS.68.031302
M3 - Artículo
AN - SCOPUS:85132667778
SN - 0035-001X
VL - 68
JO - Revista Mexicana de Fisica
JF - Revista Mexicana de Fisica
IS - 3
M1 - 031302
ER -