Mid-infrared waveguide evanescent wave sensing (Conference Presentation)

Ganapathy Senthil Murugan; Vinita Mittal; Marek Vlk; Jana Jagerska; James S. Wilkinson

doi:10.1117/12.2508591

5 March 2019 Mid-infrared waveguide evanescent wave sensing (Conference Presentation)

Ganapathy Senthil Murugan, Vinita Mittal, Marek Vlk, Jana Jagerska, James S. Wilkinson

Author Affiliations +

Proceedings Volume 10914, Optical Components and Materials XVI; 109140E (2019) https://doi.org/10.1117/12.2508591
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Mid-Infrared (Mid-IR) techniques have gained considerable attention because of their inherent molecular selectivity and their potential for rapid label-free detection in applications such as water quality and environmental monitoring, security, food safety, and point-of-care diagnostics. Waveguide evanescent-field-based Mid-IR spectroscopy can detect analytes at very low concentrations using molecular absorption fingerprints, potentially offering high sensitivity and selectivity over a wide range of compounds. Moreover, significant footprint reduction compared to ATR-based FTIR measurements can be achieved with optical waveguide-based Mid-IR sensing through integration of various optoelectronic and microfluidic components realizing fully packaged lab-on-a-chip systems. Recently we have developed low-loss chalcogenide optical waveguides and demonstrated waveguiding in the mid-wave and long-wave infrared spectral bands. High contrast GeTe4 and ZnSe channel waveguides were fabricated on bulk substrates and on silicon wafers (with suitable optical isolation layers) using lift-off and dry etching techniques after photolithographically patterning the thin films. These waveguides were exhibiting optical losses as low as 0.6 dB/cm in the mid-wave IR band and were validated for the Mid-IR evanescent wave spectroscopy with water and IPA. We have also demonstrated the effectiveness of simple paper-based fluidics with our waveguides. In addition, we investigate a new family of free-standing Ta2O5 rib waveguides for trace gas detection with evanescent field overlap with the surrounding medium (air) up to about 70%. The waveguides are being fabricated and the fabrication and characterization results will be presented.

Conference Presentation

Citation Download Citation

Ganapathy Senthil Murugan, Vinita Mittal, Marek Vlk, Jana Jagerska, and James S. Wilkinson "Mid-infrared waveguide evanescent wave sensing (Conference Presentation)", Proc. SPIE 10914, Optical Components and Materials XVI, 109140E (5 March 2019); https://doi.org/10.1117/12.2508591

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KEYWORDS

Mid-IR

Waveguides

Wave sensors

Spectroscopy

Wafer-level optics

Diagnostics

Environmental monitoring

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