Fig. 3
Calculated transition rates and R parameters. Transition characteristics due to different multipolar mechanisms of a model OsO\({}_{3}\) molecule positioned in the center of the nanoantenna are shown in function of rotation angle with respect to x (a and b) or y axis (c and d). Original orientation of multipolar moments of transition 1 is depicted in the inset of panel (a). a Transition rates between the ground state 0 and excited state j = 1. The magnetic dipole \({\Gamma }^{{\rm{MD}},\varphi }\) and electric quadrupole \({\Gamma }^{{\rm{EQ}},\varphi }\) contributions are shown with dotted blue and dashed orange lines, respectively. The total transition rate \(\Gamma\) (magenta solid line) includes the interference between the two contributing mechanisms, and may differ from their direct sum \({\Gamma }^{{\rm{MD}},\varphi }+{\Gamma }^{{\rm{EQ}},\varphi }\) (cyan dash-dotted line). b Figure of merit R indicating the respective role of the interference terms for the full transition rate shown in (a). c, d As in panels (a), (b), but for rotations of the molecule around the y axis of the coordinate frame.
