Abstract
For the last decade, germanium has been proposed as an excellent material for passive mid-infrared (MIR) integrated photonics. This technology allows for label-free sensing in the molecular fingerprint regime (6.7 - 20 µm), where molecules can be uniquely identified by their absorption spectra. Such a platform has the potential to enable low cost, miniaturized mid-infrared sensors for use in crucial applications such as explosives detection, pollution monitoring and detection of breath biomarkers for point of care diagnostics. There have now been a number of demonstrations of waveguides up to 8.5 µm wavelength using Ge [1] and SiGe [2] waveguides. Previously, we have demonstrated the first low loss Ge-on-Si waveguides from 7.5 to 11 µm, with losses as low as ~1 dB/cm [3]. Here, we demonstrate their potential for sensing applications by evanescently sensing unique vibrations in poly(methyl methacrylate) (PMMA) polymers, in the spectral region of 7.5–10 µm wavelength.
© 2019 IEEE
PDF ArticleMore Like This
U. Griškevičiūtė, R.W. Millar, K. Gallacher, L. Baldassarre, M. Sorel, M. Ortolani, and D.J. Paul
STh1N.2 CLEO: Science and Innovations (CLEO:S&I) 2019
Jinha Lim, Joonsup Shim, and SangHyeon Kim
SF2D.2 Optical Sensors (Sensors) 2021
V. Mittal, M. Nedeljkovic, A. Z. Khokhar, L. G. Carpenter, G. S. Murugan, H. M. H. Chong, P. N. Bartlett, G. Z. Mashanovich, and J. S. Wilkinson
JT4A.30 Bio-Optics: Design and Application (BODA) 2019