All-Optoelectronic CW THz-Imaging for Tumor Recognition

Since its first demonstration by Nuss et al. [1] in 1995. optoelectronic THz imaging has become a rapidly- expanding field of research [2] with the potential for applications in package inspection and in the chemical and biomedical field. Typical optoelectronic THz measurement systems employ set-ups based on femtosecond laser systems which both are expensive and have problems to obtain narrow linewidth spectral data. For these reasons, there is an interest to find conceptual alternatives. We present a THz imaging system based on the coherent generation and detection of cw THz radiation by photomixing as demonstrated by Verghese et al. [3]. Our set up is given in Fig. 1.