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The study aims to overcome propagation losses in germanium-on-silicon photonic circuits for gas sensing applications.

April 24, 2026ACS PhotonicsOpen Access

Suspended Germanium-on-Silicon Photonic Integrated Circuits Operating in the Long-Wave Infrared and Their Use for Ethanol Sensing

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Innovative platform demonstrates effective ethanol sensing in long-wave infrared using germanium-on-silicon.

The study aims to overcome propagation losses in germanium-on-silicon photonic circuits for gas sensing applications.
Introduced a suspended germanium-on-silicon platform with an 11 μm deep suspension gap.
Measured propagation loss at a wavelength of 9.2 μm in the waveguide.
Conducted ethanol gas sensing experiments with this integrated platform.
Achieved a low propagation loss of 3.5 dB/cm at 9.2 μm.
Demonstrated ethanol detection limit of 925 ppm in the long-wave infrared range.
Extended usable wavelength range for germanium-on-silicon photonic circuits.

Lin et al. (2026) studied this question.

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