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Opt Lett. 2009 Sep 1;34(17):2697-9. doi: 10.1364/OL.34.002697.

Refractive index dependence of the coupling characteristics between long-range surface-plasmon-polariton and dielectric waveguide modes.

Author information

  • 1State Key Laboratory of Integrated Optoelectronics, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China. liu_fang@tsinghua.edu.cn


The coupling characteristics of a hybrid coupler comprised of a long-range surface-plasmon-polariton (LRSPP) waveguide and a dielectric waveguide is analyzed with different detecting layers. Calculation results show that the coupling strength between the LRSPP mode and the dielectric-waveguide mode is rather sensitive to the refractive index of the detecting layer. This is promising to realize an integrated refractive index sensor with high resolution better than 4 x 10(-7) refractive index units or a modulator with rather low driving power and insert loss.

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