Uncooled bolometer-type Terahertz focal plane array and camera for real-time imaging

Real-time Terahertz (THz) imaging technologies which make use of uncooled bolometer-type infrared focal plane arrays (FPAs) and quantum cascade lasers (QCLs) will be reviewed. A description of how THz focal plane array and THz imagers have been developed on the basis of infrared technologies, especially the improvement in both THz sensitivity of bolometer-type FPA and THz transmittance of materials for lens and vacuum package window will be given. Characteristics of 320 × 240 THz-FPA, such as relation of noise equivalent power (NEP) to wavelength and real-time THz imageries will be presented. One of the imageries indicates that THz technology is promising for label-free detection of reaction of small molecules with proteins.