4-Pixel Heterodyne Receiver at 1.9 THz using a CMOS Spectrometer

We present results from a 4x1-pixel 1.9 THz
heterodyne array for the astrophysically important [CII] spectral
line. A 4-pixel multiplier chain at 1.9 THz, with a compact
spacing of 5 mm, is used as an LO. Receiver performance is
verified by y-factor measurements with measured sensitivities of
900 K. Finally, using a coherent source near the target frequency
of 1.9 THz, we down convert to baseband and measure spectra
with both an IBOB and a new CMOS-based spectrometer. The
CMOS spectrometer provides several advantages over more
traditional spectrometers because of its compact size and low
power consumption. This receiver prototype is easily scalable to
other frequencies and larger focal plane arrays. Furthermore,
because of its compact configuration, it can be easily packaged
for orbital or sub-orbital missions.