Until very recently, handheld spectrometers were the domain of major analytical and security
instrument companies, with turnkey analyzers using spectroscopic techniques from X-ray …

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 …

The unique ability of slot and sub-wavelength grating (SWG) waveguides to confine light
outside of the waveguide core material has attracted significant interest in their application to …

We demonstrate a monolithic waveguide sensor integrated with a detector on-chip for mid-
infrared absorption spectroscopic sensing. The optical sensing element comprises a …

Since atomically thin two-dimensional (2D) graphene was successfully synthesized in 2004,
it has garnered considerable interest due to its advanced properties. However, the weak …

We first demonstrated a slot waveguide based on a Ge-on-Si (GOS) platform with a 3 μm
thickness of the Ge in the mid-infrared wavelength range at 4.2 μm. We numerically …

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

A novel platform based on evanescent wave sensing in the 6.5 to 7.5 µm wavelength range
is presented with the example of toluene detection in an aqueous solution. The overall …

In recent years, sensing and communication applications have fueled important
developments of group-IV photonics in the mid-infrared band. In the long-wave range, most …