infrared millimeter terahertz waves scientific conferences

We propose an optical coherence tomography (OCT) method for distance measurement using terahertz waves based on the amplitude modulation of a resonant-tunneling-diode (RTD) oscillator. The terahertz output of the RTD oscillator is modulated in amplitude at a series of frequencies and sent to the target. The returning wave is demodulated and the distance to the object is calculated from the inverse Fourier transform of the homodyne mixing signals obtained at each of those frequencies. In principle, the distances to multiple targets can be measured; here we report the experimental verification for the case of one and two targets.