Abstract

We report the results of a study using the classical Mie theory and available experimental data of Johnson and Christy [Phys. Rev. B 6, 4370 (1972)] on the extinction spectra resulting from a transverse electric (TE) polarized wave incident upon a silver nanotube with a dielectric core. It is shown that the spectral changes separately induced by varied core radius (Rin) and the axial offset (d) are consistent with those reported for a gold spherical nanoshell calculated by the celebrated plasmon hybridization model, including the core offset induced symmetry breaking effect. This is followed by an analysis of the combined influences of Rin and d on the extinction efficiency Qext, which results in the optimal geometrical parameters of Rin=31.5nm, d=16nm, and Ag minimum shell thickness Δ=2.5nm for the maximum Qext at the resonance wavelength of λ=756nm. The different axial offsets are further shown to exhibit interesting variations of the angular distribution of the corresponding scattered wave intensity, which reveals significantly sensitive variations to different incident wave directions. The result has thus led to the following study for the exploration and demonstration of its potential development for sensing the direction of incoming TE polarized waves.

© 2019 Optical Society of America

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