Abstract

We report low-noise microwave synthesis from radiation with a frequency of 0.3 THz using a photocarrier frequency comb in a photoconductive antenna. The synthesized microwave signal at 1 GHz is phase coherent to the 0.3 THz radiation and has a fractional instability of $1\times {10}^{-15}$ within 300 s averaging times and single-sideband phase noise of $-105\mathrm{dB}/\mathrm{Hz}$ at a 100 Hz offset from the carrier. This terahertz (THz)-to-microwave synthesizer is capable of being a THz frequency divider, which would be indispensable to not only THz metrology but also future high-speed wireless networks.

© 2013 Optical Society of America

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