Suspended silicon integrated platform for the long-wavelength mid-infrared band

Sánchez-Postigo, A., Wangüemert-Pérez, G., Soler Penadés, J., Ortega-Moñux, A., Nedeljković, M., Halir, R., Mimum, F.E.M., Qu, Z., Khokhar, A.Z., Osman, A., Cao, W., Littlejohns, C.G., Mashanovich, G.Z., Cheben, P. and Molina-Fernández, I. (2019) Suspended silicon integrated platform for the long-wavelength mid-infrared band. 21st International Conference on Transparent Optical Networks, ICTON 2019, , Angers, France. 09 - 13 Jul 2019. pp. 1-4 . (doi:10.1109/ICTON.2019.8840254).

Abstract

The atmospheric-transmission window and the fingerprint region of many substances overlaps with the long-wave infrared band. This has enabled the emergence of a new path for photonic integrated circuits, which could exploit the potential applications of this wavelength range, including chemical and bio sensing. In this work we review our latest advances in the suspended silicon platform with subwavelength grating lateral cladding at 7.7-µm wavelength. Suspended waveguides only require one lithographic etch step and can be specifically designed to maximize sensitivity when used as sensors. Waveguides with propagation loss of 3.1±0.3 dB/cm are demonstrated, as well as bends with less than 0.1 dB/bend. Suspended waveguides based on shifted Bragg grating lateral cladding are also reported, with propagation loss of 5.1±0.6 dB/cm. These results prepare the ground for the development of a platform capable of covering the entire mid-infrared band.

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Contributors

Author: J. Soler Penadés

Author: M. Nedeljković

Author: A. Osman

Author: W. Cao

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