期刊
PHOTONICS
卷 4, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/photonics4010007
关键词
terahertz; ultrafast photonics; nonlinear optics
类别
资金
- European Research Council under the European Union/ERC [GA 306559]
- EPSRC (UK) [EP/J00443X/1]
- European Union [GA 299522]
- EPSRC [EP/P009697/1]
- EPSRC CM-CDT Grant [EP/L015110/1]
- NSERC (Strategic Grant Program)
- MESI (PSR-SIIRI Grant Program)
- FQRNT (Equipe Grant Program) in Canada
- Engineering and Physical Sciences Research Council [EP/J00443X/1, 1662770, EP/P009697/1] Funding Source: researchfish
- EPSRC [EP/J00443X/1, EP/P009697/1] Funding Source: UKRI
The nonlinear interaction between Near-Infrared (NIR) and Terahertz pulses is principally investigated as a means for the detection of radiation in the hardly accessible THz spectral region. Most studies have targeted second-order nonlinear processes, given their higher efficiencies, and only a limited number have addressed third-order nonlinear interactions, mainly investigating four-wave mixing in air for broadband THz detection. We have studied the nonlinear interaction between THz and NIR pulses in solid-state media (specifically diamond), and we show how the former can be frequency-shifted up to UV frequencies by the scattering from the nonlinear polarisation induced by the latter. Such UV emission differs from the well-known electric field-induced second harmonic (EFISH) one, as it is generated via a phase-insensitive scattering, rather than a sum- or difference-frequency four-wave-mixing process.
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