Abstract
Optical molecular switching in monolayers at the air-water interface due to the cis-trans photoisomerization of azobenzene derivative was first detected by the displacement current measurement. The displacement current was generated due to the trans-to-cis photo-isomerization of the azobenzene derivative by irradiation with UV light, whereas the displacement current was generated in the opposite direction due to the cis-to-trans photoisomerization by irradiation with visible light. The reversible displacement current generation was found to be sustained by alternative irradiation with UV light and visible light. Finally, the dipole moment transition with photoisomerization was estimated.
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