Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 17: Organic Semiconductors

HL 17.2: Talk

Tuesday, March 19, 2024, 09:45–10:00, EW 015

Optical and electrically driven single-molecular Raman switch — •Hai Bi — Jihua Laboratory, No.28 Huandao South road, Nanhai district, Foshan 528200, China

We have presented a single-molecular Raman switch, which is controlled not only by an applied voltage, but also by optical inputs with different directions. In this study, the combined effect of the near-field optical angular momentum and the bias voltage on the Raman response of a single molecular junction, creating a molecular switch, was investigated. It was demonstrated that the molecular switch can be manipulated using an optical input. The effects of both the polarisation of light and the subsequent symmetry properties of the electromagnetic near field were investigated and used to control the switching behaviour. This change in the Raman response of the junction is associated with a modification of the conformation of the molecule. By changing both the illumination side and the voltage applied to the junction, the Raman intensity can be turned ON and OFF with a difference of nearly five orders of magnitude between the two states.

Keywords: single-molecule; local surface plasmon; near-field; optical angular momentum