Figure 3
From: Nanosphere-in-a-nanoegg: damping the high-order modes induced by symmetry breaking
The extinction spectra and charge density distributions. (a) The extinction spectra of NSNE with different radius of Au core r 1 at r 2/r 3 = 36 nm/46 nm and d = 9 nm. The dashed line indicates the high-energy dipolar mode (l = 1*), the quadrupolar mode (l = 2), and the low-energy dipolar mode (l = 1). (b) The charge density distributions of the high-energy dipolar mode (\( {\left|{\omega}_{-}^{+}\right\rangle}_1 \), 514 nm), the quadrupolar mode (\( {\left|{\omega}_{-}^{-}\right\rangle}_2 \), 776 nm), and the low-energy dipolar mode (\( {\left|{\omega}_{-}^{-}\right\rangle}_1 \), 1,025 nm) of NSNE with r 1/r 2/r 3/d = 28 nm/36 nm/46 nm/9 nm.