Fig. 1: Homodyne fringes in the measurement setup and exemplary data-fitting.
From: Visualizing nanometric structures with sub-millimeter waves
a Homodyne photomixing setup. The lengths \({l}_{s}={{n}_{F}l}_{E}+{l}_{{THz}}\) and \({l}_{r}={n}_{F}{l}_{R}\) correspond to the optical path lengths of the two Mach–Zehnder interferometer arms, \({n}_{F}\) being the refractive index of the optical fibers after the 3 dB coupler. b Raw homodyne data. c Extracted phase of a sample with a thickness of \({d}_{S}=\) 509.3 µm and a refractive index of \({n}_{S}=\) 3.416 (silicon). The reference measurement of the empty setup has already been subtracted.
