Plasmonics

, Volume 8, Issue 2, pp 233–237

Efficient All-Optical Molecule-Plasmon Modulation Based on T-shape Single Slit

Authors

    • State Key Laboratory of Information Photonics and Optical CommunicationsBeijing University of Posts and Telecommunications
    • School of ScienceBeijing University of Posts and Telecommunications
    • State Key Laboratory for Mesoscopic Physics and Department of PhysicsPeking University
  • Zhi Li
    • State Key Laboratory for Mesoscopic Physics and Department of PhysicsPeking University
  • Jinghua Xiao
    • State Key Laboratory of Information Photonics and Optical CommunicationsBeijing University of Posts and Telecommunications
    • School of ScienceBeijing University of Posts and Telecommunications
  • Qihuang Gong
    • State Key Laboratory for Mesoscopic Physics and Department of PhysicsPeking University
Article

DOI: 10.1007/s11468-012-9380-2

Cite this article as:
Chen, J., Li, Z., Xiao, J. et al. Plasmonics (2013) 8: 233. doi:10.1007/s11468-012-9380-2

Abstract

Efficient all-optical molecule-plasmon modulation is experimentally demonstrated by employing a compact T-shape single slit on a metal film coated with an azopolymer film, in which the azobenzene molecules can be reoriented by a pump beam. In the T-shape single slit, the transmission spectra exhibit periodic behaviors and are quite sensitive to variations of the refractive index of the azopolymer in the groove. Under a pump beam, the azobenzene molecules are reoriented, so the SPPs in the groove feel a refractive index quite different from that of the originally isotropic azopolymer with randomly orientations. This leads to a high modulation depth of about 53 % (3.3 dB) and a phase variation of >π experimentally.

Keywords

Surface plasmon polaritonsAll opticsModulationMolecule reorientations

Copyright information

© Springer Science+Business Media, LLC 2012