Bloch surface waves in ultrathin waveguides: near-field investigation of mode polarization and propagation

In this work, we use a multi-heterodyne scanning near-field optical microscope to investigate the polarization and propagation of Bloch surface waves in an ultrathin (similar to lambda/10) ridge waveguide. First, we show that the structure sustains three surface modes, and demonstrate selective excitation of each. Then, by numerically processing the experimental data, we retrieve the transverse and longitudinal components of each of the modes, in good agreement with the calculated fields. Finally, we provide an experimental estimation of the effective indices and the dispersion relations of the modes. (C) 2010 Optical Society of America


Published in:
Journal Of The Optical Society Of America B-Optical Physics, 27, 8, 1617-1625
Year:
2010
ISSN:
1520-8540
Keywords:
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 Record created 2010-08-19, last modified 2018-03-18

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