In this Letter, a hollow waveguide (HWG)-based light-induced thermoelastic spectroscopy
(LITES) gas sensing is proposed. An HWG with a length of 65 cm and inner diameter of 4 …

Respiratory illness demands pragmatic clinical monitoring and diagnosis to curb numerous
fatal diseases in all aged groups. Due to the complicated instrumentation, long amplification …

Real-time wireless respiratory monitoring and biomarker analysis provide an attractive
vision for noninvasive telemedicine such as the timely prevention of respiratory arrest or for …

In this paper, a sensitive carbon monoxide (CO) detection system based on light induced
thermoelastic spectroscopy (LITES) using a hollow waveguide (HWG) and 2.3 μm diode …

Absorption spectroscopy based on Lambert-Beer law has been widely used in material
structure analysis, research in chemical reaction kinetics, and exploration of various …

We demonstrate for the first time the measurement of CO2 isotope ratios (13C/12C and
18O/16O) in a hollow waveguide (HWG) fiber using a mid-infrared heterodyne phase …

Plasmonic slot waveguides have attracted much attention due to the possibility of high light
confinement, although they suffer from relatively high propagation loss originating from the …

Combined in situ analysis of oceanic CO2 concentrations and diverse C and O isotope
characteristics can offer a unique perspective with multiple isotopic tracing dimensions for …

In this work, we investigated the optimization of a plasmonic slot waveguide (PSWG) in the
mid-IR region particularly for a representative wavelength of 4.26 µm, which is the …

A compact gas sensor has been developed for the first time employing a quantum cascade
laser (QCL) with a central wavelength of 4.32 μm, combined with direct absorption …