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We present a heterodyne terahertz spectrometry platform based on plasmonicphotomixing, which enables the resolution of narrow spectral signatures ofgases over a broad terahertz frequency range. This plasmonic heterodynespectrometer replaces the terahertz mixer and local oscillator of conventionalheterodyne spectrometers with a plasmonic photomixer and a heterodyning opticalpump beam, respectively. The heterodyning optical pump beam is formed by twocontinuous-wave, wavelength-tunable lasers with a broadly tunable terahertzbeat frequency. This broadly tunable terahertz beat frequency enablesspectrometry over a broad bandwidth, which is not restricted by the bandwidthlimitations of conventional terahertz mixers and local oscillators. We use thisplasmonic heterodyne spectrometry platform to resolve the spectral signaturesof ammonia over a 1-5 THz frequency range.

Plasmonic Heterodyne Spectrometry for Resolving the Spectral Signatures of Ammonia over a 1-5 THz Frequency Range