  Slow data acquisition in terahertz time-domain spectroscopy (THz-TDS) has
hindered the technique's ability to resolve "fast" dynamics occurring on the
microsecond timescale. This timescale, arguably too slow to be accessed via
standard optical pump-probe techniques relying on ultrafast sources, hosts a
range of phenomena that has been left unexplored due to a lack of proper
real-time monitoring techniques. In this work, chirped-pulse spectral encoding,
a photonic time-stretch technique, and high-speed electronics are used to
demonstrate time-resolved THz detection at a rate up to 1.1 MHz. This
configuration relies on a table-top source and a setup able to resolve every
THz transient that it can generate. We investigate the performance of this
system at different acquisition rates in terms of experimental noise, dynamic
range, and signal-to-noise ratio. Our results pave the way towards single-pulse
THz-TDS at arbitrarily fast rates to monitor complex dynamics in real-time.
