Ge-on-Si waveguide device for self-referenced fingerprint region absorption spectroscopy

M. Nedeljkovic; C. Stirling; D. J. Rowe; M. Banakar; Y. Qi; X. Yan; C. G. Littlejohns; G. Z. Mashanovich

doi:10.1117/12.2650469

13 March 2023 Ge-on-Si waveguide device for self-referenced fingerprint region absorption spectroscopy

M. Nedeljkovic, C. Stirling, D. J. Rowe, M. Banakar, Y. Qi, X. Yan, C. G. Littlejohns, G. Z. Mashanovich

Proceedings Volume 12426, Silicon Photonics XVIII; 124260I (2023) https://doi.org/10.1117/12.2650469
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

We present the development of Ge-on-Si waveguide-based devices for low-noise mid-infrared absorption spectroscopy of aqueous solutions, targeting wavelengths between 6 and 10 μm, that are able to reduce the relative intensity noise which is a key roadblock when measuring tiny analyte absorptions masked by a large background matrix absorption. The sensor uses a pair of integrated thermo-optic switches to continuously switch light between a reference waveguide and a sensor waveguide, so that common noise components can be cancelled out, even when the light source and photodetector are not integrated on the same chip.

Conference Presentation

Citation Download Citation

M. Nedeljkovic, C. Stirling, D. J. Rowe, M. Banakar, Y. Qi, X. Yan, C. G. Littlejohns, and G. Z. Mashanovich "Ge-on-Si waveguide device for self-referenced fingerprint region absorption spectroscopy", Proc. SPIE 12426, Silicon Photonics XVIII, 124260I (13 March 2023); https://doi.org/10.1117/12.2650469

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