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

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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.

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Acknowledgments

This work was supported by the National Basic Research Program of China (grant nos. 2010CB923200, 2009CB930504, and 2007CB307001) and the National Natural Science Foundation of China (grant nos. 10804004, 10821062, 51172030, and 90921008).

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Authors and Affiliations

  1. State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Jianjun Chen & Jinghua Xiao

  2. School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Jianjun Chen & Jinghua Xiao

  3. State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing, 100871, China

    Jianjun Chen, Zhi Li & Qihuang Gong

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  1. Jianjun Chen
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  2. Zhi Li
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  3. Jinghua Xiao
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  4. Qihuang Gong
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Correspondence to Jianjun Chen.

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Chen, J., Li, Z., Xiao, J. et al. Efficient All-Optical Molecule-Plasmon Modulation Based on T-shape Single Slit. Plasmonics 8, 233–237 (2013). https://doi.org/10.1007/s11468-012-9380-2

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  • DOI: https://doi.org/10.1007/s11468-012-9380-2

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