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

Citation:

Chen, J., Li, Z., Xiao, J. & Gong, Q. Efficient All-Optical Molecule-Plasmon Modulation Based on T-shape Single Slit. PLASMONICS 8, 233-237 (2013).

摘要:

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 >pi experimentally.
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