  THz waves are promising wireless carriers for next-generation wireless
communications, where a seamless connection from wireless to optical
communication is required. In this study, we demonstrate carrier conversion
from THz waves to dual-wavelength NIR light injection-locking to an optical
frequency comb using asynchronous nonpolarimetric electro-optic downconversion
with an electro-optic polymer modulator. THz wave in the W band was obtained as
a stable photonic RF beat signal of 1 GHz with a signal-to-noise ratio of 25 dB
via the proposed THz-to-NIR carrier conversion. In addition, the results imply
the potential of the photonic detection of THz waves for wireless-to-optical
seamless communication.
