Abstract
The nonlocal effect on the spontaneous emission of a silver cuboid dimer is
investigated using a local analog model. Magnetic as well as electric dipole excitations
are introduced to excite different gap modes. The nonlocal response of electric and
magnetic modes on various parameters of gap (width and refractive index) are
investigated. Unidirectional radiation is achieved by the interaction between electric
and magnetic modes in both local and nonlocal models. Compared to local simulations, the
resonant wavelength is blue shifted and the spontaneous emission enhancement is weakened
in the nonlocal model. The relative shifts of the resonant wavelengths get larger in
smaller gaps with a higher refractive index.
© 2016 Chinese Laser Press
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