Effect of symmetry breaking and substrate on the optical properties of silver sphere-like nanoparticles in different surrounding media

Mohammed Alsawafta; Mamoun Wahbeh; Vo-Van Truong

doi:10.1117/12.2086149

25 September 2014 Effect of symmetry breaking and substrate on the optical properties of silver sphere-like nanoparticles in different surrounding media

Mohammed Alsawafta, Mamoun Wahbeh, Vo-Van Truong

Author Affiliations +

Proceedings Volume 9288, Photonics North 2014; 92881A (2014) https://doi.org/10.1117/12.2086149
Event: Photonics North 2014, 2014, Montréal, Canada

Abstract

The effect of the substrate to the absorption spectra of silver nanoparticles of sphere-like shapes is investigated. Silver nanoparticles of broken spherical symmetry are placed on substrates of different dielectric functions at various contact angles (α). The absorption efficiency of the supported nanoparticles is calculated by using the Discrete Dipole Approximation (DDA) method. Increasing the value of α and, hence the contact area of the supported nanoparticles, results in an inhomogeneous distribution of the polarization charges over the nanoparticle-substrate system. This leads to the excitation of plasmonic bands of different characters (dipolar and quadrupole modes). The admixture of both dipolar and quadrupole modes is found to be more pronounced when a nanoparticle with highest contact area (α = 90o, hemispherical shape) is considered. The band position of the Longitudinal Mode (LM) is red-shifted with α, while the resonance wavelength of the Transverse Mode (TM) is blue-shifted.

Citation Download Citation

Mohammed Alsawafta, Mamoun Wahbeh, and Vo-Van Truong "Effect of symmetry breaking and substrate on the optical properties of silver sphere-like nanoparticles in different surrounding media", Proc. SPIE 9288, Photonics North 2014, 92881A (25 September 2014); https://doi.org/10.1117/12.2086149

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