Silicon subwavelength photonics : from fundamentals to applications in optical interconnects, spectroscopy and biological sensing

Cheben, Pavel and Schmid, J. H. and Bock, P. J. and Lapointe, Jean and Janz, S. and Xu, D X and Densmore, A and Delage, A and Ma, R and Halir, R and Lamontagne, B and Ortega-Monux, A and Molina-Fernandez, I and Ramos, C.A. and Fedeli, J.M. and Ibrahim, M and Ye, W.N. and Glesk, Ivan and Hall, T.J. (2011) Silicon subwavelength photonics : from fundamentals to applications in optical interconnects, spectroscopy and biological sensing. In: Advanced Technology Institute Seminar, 2011-12-01 - 2011-12-01.

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Abstract

Recent advances in silicon photonics research at the National Research Council of Canada will be reviewed. A new type of microphotonic waveguides will be presented, exploiting the subwavelength grating (SWG) effect. The SWG technique [1] allows for engineering of the refractive index of a waveguide core over a range as broad as 1.5–3.5 simply by lithographic patterning using only two materials, for example Si and SiO2. Several examples of subwavelength grating waveguides and components implemented in silicon-on-insulator and operating at telecom wavelengths will be presented. These include waveguide crossings with minimal loss (<0.03 dB) and negligible crosstalk, fibre-chip edge couplers with a loss <1 dB, apodised surface grating couplers, high-performance MMI couplers, polarization rotators, athermal waveguides and planar waveguide multiplexers. Emerging applications in spectroscopy and biological sensing will be discussed.