Since the first demonstration in 1994, progress in the development of quantum cascade
lasers (QCLs) has been breathtakingly rapid. Various techniques based upon novel QCLs …

Detecting trace explosives and explosive-related compounds has recently become a topic of
utmost importance for increasing public security around the world. A wide variety of …

We demonstrate compact, low power, lightweight laser-based sensors for measuring trace
gas species in the atmosphere designed specifically for electronic unmanned aerial vehicle …

In this paper we discuss silicon-based photonic integrated circuit technology for applications
beyond the telecommunication wavelength range. Silicon-on-insulator and germanium-on …

We report on the development of a highly sensitive photoacoustic (PA) spectrometer based
on a miniaturized all-optical detecting sensor. The sensor has a cell volume of less than 6 μL …

The performance of a photoacoustic trace gas sensor for the detection of acetone in N 2 and
synthetic air is reported. The sensor system utilises an amplitude modulated UV LED. The …

Photoacoustic cells are a type of optical sensors than can be used to detect trace gases. The
photoacoustic spectroscopic technique is based on the absorption of photons by the …

Trace gas analysis in breath is challenging due to the vast number of different components.
We present a highly sensitive quantum cascade laser based photoacoustic setup for breath …

The carbon dioxide isotope in human exhaled gas can be used as an indicator to determine
Helicobacter pylori (HP), the detection of carbon dioxide isotope in human exhaled gas is of …

Development of both fundamental research and clinical applications of photoacoustic
imaging call for ultrasound detectors of high sensitivity, flat frequency response, and …