Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 13: Transport: Poster Session
TT 13.28: Poster
Monday, March 26, 2012, 15:00–19:00, Poster B
Attenuated total reflection (ATR)-study of the reversible switching of immobilized ring-opening/ring-closure molecular switches — •Katharina Luka-Guth1, Dmytro Sysoiev2, Youngsang Kim1, Johannes Boneberg1, Paul Leiderer1, Jannic Wolf2, Thomas Huhn2, Ulrich Groth2, and Elke Scheer1 — 1Fachbereich Physik, Universität Konstanz — 2Fachbereich Chemie, Universität Konstanz
We study the conformational changes of the photochromic difurylperfluorocyclopentene molecules induced by optical switching by attenuated total reflection (ATR) measurements.
A single layer of molecules is chemisorbed on a 40-nm thin layer of gold. We measure the reflected intensity of near infrared-light that is coupled-in from the rear side of the molecular layer on gold on a glass substrate (Kretschmann geometry) and observe the reflection decrease due to the excitation of surface plasmons at the interface between gold and the determine the atmosphere. Upon irradiation with UV and red light, respectively, the molecules are switched between the open, low-conducting and the closed, highly conducting state. We detect the change of the ATR signal while switching for a series of molecules in lock-in technique and discuss their potential applications in molecular electronics devices.