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Open AccessArticle

Waveguided Approach for Difference Frequency Generation of Broadly-Tunable Continuous-Wave Terahertz Radiation

INO, Istituto Nazionale di Ottica-CNR, Largo E. Fermi 6, I-50125 Firenze, Italy
LENS, European Laboratory for Nonlinear Spectroscopy, Via N. Carrara 1, Sesto, I-50019 Fiorentino, Italy
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(12), 2374;
Received: 9 October 2018 / Revised: 19 November 2018 / Accepted: 20 November 2018 / Published: 24 November 2018
(This article belongs to the Special Issue Recent Advances in Plasmonics and Nanophotonics)
The 1–10 terahertz (THz) spectral window is emerging as a key region for plenty of applications, requiring not yet available continuous-wave room-temperature THz spectrometers with high spectral purity and ultra-broad tunability. In this regard, the spectral features of stabilized telecom sources can actually be transferred to the THz range by difference frequency generation, considering that the width of the accessible THz spectrum generally scales with the area involved in the nonlinear interaction. For this reason, in this paper we extensively discuss the role of Lithium Niobate (LN) channel-waveguides in the experimental accomplishment of a room-temperature continuous wave (CW) spectrometer, with μW-range power levels and a spectral coverage of up to 7.5 THz. To this purpose, and looking for further improvements, a thought characterization of specially-designed LN waveguides is presented, whilst discussing its nonlinear efficiency and its unprecedented capability to handle high optical power (107 W/cm2), on the basis of a three-wave-mixing theoretical model. View Full-Text
Keywords: waveguide; nonlinear optics; terahertz sources waveguide; nonlinear optics; terahertz sources
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De Regis, M.; Consolino, L.; Bartalini, S.; De Natale, P. Waveguided Approach for Difference Frequency Generation of Broadly-Tunable Continuous-Wave Terahertz Radiation. Appl. Sci. 2018, 8, 2374.

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