期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms15763
关键词
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资金
- ERC grant SPRINT
- ERC grant Hetero2D
- ERC grant HiGRAPHINK
- EU Graphene Flagship
- EPSRC [EP/K01711X/1, EP/K017144/1, EP/L016087/1, EP/N010345/1]
- Engineering and Physical Sciences Research Council [EP/K017144/1, EP/K01711X/1, EP/J017671/1, EP/N010345/1, EP/G042357/1] Funding Source: researchfish
- EPSRC [EP/K01711X/1, EP/G042357/1, EP/K017144/1, EP/N010345/1, EP/J017671/1] Funding Source: UKRI
Saturable absorbers (SA) operating at terahertz (THz) frequencies can open new frontiers in the development of passively mode-locked THz micro-sources. Here we report the fabrication of THz SAs by transfer coating and inkjet printing single and few-layer graphene films prepared by liquid phase exfoliation of graphite. Open-aperture z-scan measurements with a 3.5 THz quantum cascade laser show a transparency modulation similar to 80%, almost one order of magnitude larger than that reported to date at THz frequencies. Fourier-transform infrared spectroscopy provides evidence of intraband-controlled absorption bleaching. These results pave the way to the integration of graphene-based SA with electrically pumped THz semiconductor micro-sources, with prospects for applications where excitation of specific transitions on short time scales is essential, such as time-of-flight tomography, coherent manipulation of quantum systems, time-resolved spectroscopy of gases, complex molecules and cold samples and ultra-high speed communications, providing unprecedented compactness and resolution.
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