title: Modifying photoisomerization efficiency by metallic nanostructures.
abstract: Trans-to-cis photoisomerization efficiency of azobenzene dye is artificially modified from 0.09 to 0.38 when dye molecules are placed close to gold nanoparticle films with different structures. Transient fluorescence and surface enhanced Raman scattering measurement verify that the enhancement and reduction of photoisomerization efficiency come from the competition between enhanced local optical field from surface plasmon resonance and the accelerated nonradiative decay of excited dye molecules. The photoisomerization efficiency can be further modified by controlling the distance between azobenzene dye and gold films. Our finding can be applied to improve the performance of photoisomerization effect in photochemistry and photonics.
authors.affiliation: Key Lab for Micro and Nanophotonic Structures (Ministry of Education), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433,China.
authors.forename: Shen
authors.initials: S
authors.lastname: Xu
authors.forename: Jiong
authors.initials: J
authors.lastname: Shan
authors.forename: Wei
authors.initials: W
authors.lastname: Shi
authors.forename: Liying
authors.initials: L
authors.lastname: Liu
authors.forename: Lei
authors.initials: L
authors.lastname: Xu
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D005453:Fluorescence; D006046:Gold / Q000737:chemistry*; D007536:Isomerism; D053768:Metal Nanoparticles / Q000737:chemistry*; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation / Q000379:methods*; D055668:Photochemical Processes; D013059:Spectrum Analysis, Raman / Q000295:instrumentation / Q000379:methods*; D020349:Surface Plasmon Resonance / Q000295:instrumentation / Q000379:methods*
chemical_list: D001391:Azo Compounds; D006046:Gold; C009850:azobenzene