We present a tunable multifrequency continuous wave terahertz spectrometer based on two laser diodes, photoconductive antennas, and a coherent detection scheme. The system is employed to determine the absolute thickness of samples utilizing a proposed synthetic difference frequency method to circumvent the 2π uncertainty known from conventional photomixing systems while preserving a high spatial resolution.
|Original language||English (US)|
|Journal||Applied Physics Letters|
|State||Published - Apr 12 2010|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)