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Updated: Jun 23, 2025

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
Low-Loss Buried InGaAs/InP Integrated Waveguides in the Long-Wave Infrared
Miguel Montesinos-Ballester1, Elsa Jöchl1, Victor Turpaud2
1Institute for Quantum Electronics, ETH Zürich, CH-8093 Zürich, Switzerland.
Abstract:
In this work, we present a photonic integrated platform based on buried InGaAs waveguides with InP cladding that operates over a large mid-infrared (mid-IR) spectral range. Thanks to wet-etch fabrication patterning and Fe doping, low propagation losses below 1.2 dB/cm (0.3 cm-1 loss coefficient) have been obtained between 4.6 and 11.2 μm wavelengths (890-1960 cm-1 wavenumber), in both transverse electric (TE) and transverse magnetic (TM) polarization modes. The possibility of monolithically integrating such waveguides with mid-IR sources offers promising perspectives for developing broadband, homogeneously integrated systems.
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