Cheben, P., Schmid, J.H., Xu, D.-X., Janz, S., Lapointe, J., Rahim, M., Wang, S., Vachon, M., Halir, R., Ortega-Moñux, A., Sarmiento-Merenguel, J. D., Wangüemert Pérez, G., Molina-Fernández, I., Pond, J., Benediković, D., Alonso-Ramos, C., Le Roux, X., Vivien, L., Marris-Morini, D., Soler Penadés, J., Nedeljković, M., Mashanovich, G.Z., Velasco, A.V., Calvo, M.L., Dado, M., Müllerová, J., Ye, W., Papes, M. and Vasinek, V. (2016) Subwavelength structures for nanophotonic couplers, colourless splitters, polarization control and mid-infrared waveguides. International Conference on Transparent Optical Networks (ICTON) 2016, Trento, Italy. 10 - 14 Jul 2016. 1 pp . (doi:10.1109/icton.2016.7550536).
Abstract
We report our recent advances in development of subwavelength engineered dielectric metamaterial structures for integrated photonics. By locally engineering the refractive index of silicon by forming a pattern of holes at the subwavelength scale it is possible to manipulate the flow of light in silicon nanophotonic waveguides [1], [2], [3], [4], [5], [6]. Specifically, we present a broadband fibre-chip edge coupler with a coupling efficiency exceeding 90% for direct coupling between cleaved SMF-28 optical fibres and silicon nanophotonic waveguides [7], as well as the first implementation of a subwavelength nanostructure for laser-to-SOI chip coupling experiments with an InGaAsP/InP buried heterostructure laser. Furthermore, we report on dispersion engineered colourless multimode interference coupler operating over an ultra-broad wavelength range 1260 nm – 1675 nm, exceeding the O, E, S, C, L and U optical communication bands. We also present an integrated polarization controller with largely relaxed fabrication tolerances and tuneable over the complete C-band, with a measured polarization extinction range of 40 dB [8]. Implementations of subwavelength grating engineered structures for evanescent field sensing and mid-infrared silicon photonic circuits [9] with waveguide propagation losses < 0.9 dB/cm at 3.88 µm will also be discussed.
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