The emergence of silicon photonics over the past two decades has established silicon as a
preferred substrate platform for photonic integration. While most silicon-based photonic …

Germanium (Ge) has played a key role in silicon photonics as an enabling material for
datacom applications. Indeed, the unique properties of Ge have been leveraged to develop …

Nanophotonic waveguides that implement long optical pathlengths on chips are promising
to enable chip-scale gas sensors. Nevertheless, current absorption-based waveguide …

On-chip waveguide sensors are potential candidates for deep-space exploration because of
their high integration and low power consumption. Since the fundamental absorption of most …

Abstract Long-wave infrared (LWIR, 6–14 µm) processes enormous potential for
chem/biosensing as it covers abundant molecular absorption fingerprints. Waveguides …

Alloys of sulfur, selenium and tellurium, often referred to as chalcogenide semiconductors,
offer a highly versatile, compositionally-controllable material platform for a variety of passive …

A surface-enhanced infrared absorption spectroscopic chalcogenide waveguide sensor
based on the silver island film was proposed for the first time to enhance the sensing …

Miniaturized optical spectrometers providing broadband operation and fine resolution have
an immense potential for applications in remote sensing, non-invasive medical diagnostics …

The advantages of integrating infrared (IR) waveguide gas sensors on a chip include
compactness, low power consumption, and high selectivity. Mid-IR waveguide sensors …

Compared with direct absorption spectroscopy (DAS), wavelength modulation spectroscopy
(WMS) with good ability of suppressing noise is rarely used in waveguide sensor. The …