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Title: Suspended silicon waveguides for long-wave infrared wavelengths
Authors: Sánchez-Postigo, A.
Nedeljkovic, M.
Ortega-Moñux, A.
Wangüemert-Pérez, J. G.
Xu, Y.
Halir, R.
Qu, Z.
Khokhar, A. Z.
Osman, A.
Cao, W.
Littlejohns, Callum G.
Cheben, P.
Molina-Fernández, I.
Mashanovich, G. Z.
Penadés, J. Soler
Keywords: Silicon Photonics
DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Penadés, J. S., Sánchez-Postigo, A., Nedeljkovic, M., Ortega-Moñux, A., Wangüemert-Pérez, J. G., Xu, Y., . . . Mashanovich, G. Z. (2018). Suspended silicon waveguides for long-wave infrared wavelengths. Optics Letters, 43(4), 795-. doi:10.1364/OL.43.000795
Series/Report no.: Optics Letters
Abstract: In this Letter, we report suspended silicon waveguides operating at a wavelength of 7.67 μm with a propagation loss of 3.1±0.3  dB/cm. To our knowledge, this is the first demonstration of low-loss silicon waveguides at such a long wavelength, with loss comparable to other platforms that use more exotic materials. The suspended Si waveguide core is supported by a sub-wavelength grating that provides lateral optical confinement while also allowing access to the buried oxide layer so that it can be wet etched using hydrofluoric acid. We also demonstrate low-loss waveguide bends and s-bends.
ISSN: 0146-9592
DOI: 10.1364/OL.43.000795
Rights: © 2018 Optical Society of America. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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