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Journal of Nanomaterials
Volume 2014, Article ID 394976, 9 pages
Research Article

Variable Optical Attenuator Based on Long-Range Surface Plasmon Polariton Multimode Interference Coupler

State Key laboratory on Integrated Optoelectronics, Jilin University, Changchun, Jilin 130012, China

Received 28 February 2014; Accepted 2 April 2014; Published 22 April 2014

Academic Editor: Tong Zhang

Copyright © 2014 Xiaoqiang Sun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The fabrication and characterization of a thermal variable optical attenuator based on long-range surface plasmon polariton (LRSPP) waveguide with multimode interference architecture were investigated. The surface morphology and waveguide configuration of Au stripe were studied by atomic force microscopy. The fluctuation of refractive index of poly(methyl-methacrylate-glycidyl-methacrylate) polymer cladding was confirmed to be less than within 8 h curing at . The end-fire excitation of LRSPP mode guiding at 1550 nm along Au stripe indicated that the extinction ratio of attenuator was about 12 dB at a driving power of 69 mW. The measured optical rise time and fall time are 0.57 and 0.87 ms, respectively. These favorable properties promise potentials of this plasmonic device in the application of optical interconnection.