Ultrathin waveguides for Bloch surface waves: Near-field analysis of propagation and polarization

Tristan Sfez, Libo Yu, Hans Peter Herzig, Emiliano Descrovi, Marzia Quaglio, Fabrizio Giorgis, Lorenzo Dominici, Francesco Michelotti, Daniele Brunazzo, Olivier J. F. Martin, Wataru Nakagawa
2010 2010 IEEE Photinic Society's 23rd Annual Meeting  
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 ͑ϳ /10͒ 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
more » ... inally, we provide an experimental estimation of the effective indices and the dispersion relations of the modes.
doi:10.1109/photonics.2010.5698953 fatcat:2l5krrdh6nce7agx5b7z6iso4a