In this paper, we present the design of a new photonic crystal fiber (PCF) gas sensor for evanescent-field sensing in terahertz (THz) wave band. This sensor can be used to identify the gas, and its size is very large, so that it is beneficial to fill it w
A method of chromatic polarization imaging is presented for the online detection of colorless plastic contaminants from ginned cotton in an industrial setting. To understand the experimental results, we consider a realistic microscopic model, including th