In this work, we employ linear-response TDDFT and real-time TDDFT methods to investigate the electron-beam-induced (EBI) plasmonic excitation dynamics and corresponding electron energy loss spectrum for molecular silver nanowires. The arrays of nanowires with different relative orientations are investigated to understand their plasmonic dynamical behaviors responding to different initial EBI excitation conditions. The results demonstrate (1) an electron-beam can induce both the optically allowed and forbidden plasmonic excitations; (2) a tunability for selective excitations that can be controlled by the position of a focused electron-beam; and (3) kinetic and dynamic behaviors of EBI energy transfer between two nanowires, which depend on the position and orientation of the beam source as well as the nanowire separation distance, providing insights into the spatial dependences of plasmonic couplings in nanowire arrays.

Electron-beam-induced molecular plasmon excitation and energy transfer in silver molecular nanowires

ACS Spring Meeting 2021

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