A Hyphenated Preconcentrator-Infrared-Hollow-Waveguide Sensor System for N2O Sensing

Low-Loss Hollow Waveguide Fibers for Mid-Infrared Quantum Cascade Laser Sensing Applications

We report on single mode optical transmission of hollow core glass waveguides (HWG) coupled with an external cavity mid-IR quantum cascade lasers (QCLs). The QCL mode results perfectly matched to the hybrid HE(11) waveguide mode and the higher losses TE-like modes have efficiently suppressed by the deposited inner dielectric coating. Optical losses down to 0.44 dB/m and output beam divergence o...

A Micro-Preconcentrator Combined Olfactory Sensing System with a Micromechanical Cantilever Sensor for Detecting 2,4-Dinitrotoluene Gas Vapor

Preventing unexpected explosive attacks and tracing explosion-related molecules require the development of highly sensitive gas-vapor detection systems. For that purpose, a micromechanical cantilever-based olfactory sensing system including a sample preconcentrator was developed to detect 2,4-dinitrotoluene (2,4-DNT), which is a well-known by-product of the explosive molecule trinitrotoluene (T...

Hollow core waveguide as mid-infrared laser modal beam filter

A Panoramic Shortwave Infrared Hyperspectral Sensor for Maritime Sensing

Introduction: The U.S. Navy is exploring new technologies aimed at improving maritime electro-optic and infrared imaging systems. Specific goals include the enhancement of day/night, wide-area situational awareness; improved detection, identification, and tracking capabilities; and increased system reliability. Developing an imaging system that can accomplish these objectives is a tremendous de...

Real-Time Sensing of Cell Morphology by Infrared Waveguide Spectroscopy

We demonstrate that a live epithelial cell monolayer can act as a planar waveguide. Our infrared reflectivity measurements show that highly differentiated simple epithelial cells, which maintain tight intercellular connectivity, support efficient waveguiding of the infrared light in the spectral region of 1.4-2.5 µm and 3.5-4 µm. The wavelength and the magnitude of the waveguide mode resonances...