CUED Publications database

Terahertz saturable absorbers from liquid phase exfoliation of graphite.

Bianchi, V and Carey, T and Viti, L and Li, L and Linfield, EH and Davies, AG and Tredicucci, A and Yoon, D and Karagiannidis, PG and Lombardi, L and Tomarchio, F and Ferrari, AC and Torrisi, F and Vitiello, MS (2017) Terahertz saturable absorbers from liquid phase exfoliation of graphite. Nat Commun, 8. 15763-.

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Abstract

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 ∼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.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:06
Last Modified: 14 Sep 2017 01:25
DOI: