Optical gas sensors play an increasingly important role in many applications. Sensing
techniques based on mid-infrared absorption spectroscopy offer excellent stability …

Silicon photonics has been an area of active research and development. Researchers have
been working on enhancing the integration density and intricacy of silicon photonic circuits …

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 …

The global trends of urbanization and industrialization have given rise to critical
environmental and air pollution issues that often receive insufficient attention. Among the …

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

In this study, we demonstrate on-chip terahertz absorption spectroscopy using dielectric
waveguide structures. The structures' evanescent fields interact with the sample material …

Integrated mid-infrared sensing offers opportunities for the compact, selective, label-free and
non-invasive detection of the absorption fingerprints of many chemical compounds, which is …

We propose a dual-polarization optimization method for the bulk sensitivity of silicon-on-
insulator (SOI) waveguides by defining a multi-objective function that accounts for the …

In this paper, we propose a compact optical gas sensor based on the widespread silicon-on-
insulator (SOI) technology, operating in the near-infrared (NIR) region around the 1.55 µm …