Longitudinal polarizability and enhancement factor of a tapered optical gold nanoantenna

19th International Youth School on Coherent Optics and Optical Spectroscopy

Gazizov, A.R.^1,2 ; Kharintsev, S.S.^1 ; Salakhov, M.Kh.^1,2

Kazan Federal University, 18 Kremlevskaya str., Kazan

420008, Russia^1

Academy of Science of the Republic Tatarstan, 20 Bauman str., Kazan

420111, Russia^2

关键词: Complex fields;    Curvature radii;    Dynamic polarization;    Electric field enhancement;    Enhancement factor;    Field enhancement factor;    Optical antennae;    Polarizabilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/714/1/012011/pdf
DOI  :  10.1088/1742-6596/714/1/012011

来源: IOP

【 摘 要 】

This work focuses on the mechanism of electric field enhancement near a tapered optical antenna and the calculation of a complex field enhancement factor as a function of tip material, its curvature radius and cone angle. In this paper, an analytical model of longitudinal polarizability, taking into account retardation and dynamic polarization effects, is developed for evaluating the field enhancement factor.