Integrated Four-Pixel Narrow-Band Antenna Array for Picosecond THz Spectroscopy

One of the most promising sources for pulsed terahertz (THz) radiation is coherent synchrotron radiation (CSR). Due to their response time in the picosecond range, direct THz detectors based on YBa
₂
Cu
₃
O
_7-x
hot-electron bolometers are ideally suited for the analysis of electron-beam instabilities occurring in the synchrotron storage ring and affecting the emitted CSR spectrum. Response times of down to 16 ps full-width at half-maximum (FWHM) have been already achieved with wideband antenna-coupled detectors. We are presenting an integrated array combining this fast detector response time with the capability of single-shot spectral resolution for individual CSR pulses. The detector array consists of an integrated four-pixel array that contains four narrow-band double-slot antennas with embedded detectors.