Terahertz saturable absorbers from liquid phase exfoliation of graphite

被引：96

作者：

Bianchi, Vezio ^{[1
,2
]}

Carey, Tian ^{[3
]}

Viti, Leonardo ^{[1
,2
]}

Li, Lianhe ^{[4
]}

Linfield, Edmund H. ^{[4
]}

Davies, A. Giles ^{[4
]}

Tredicucci, Alessandro ^{[5
]}

Yoon, Duhee ^{[3
]}

Karagiannidis, Panagiotis G. ^{[3
]}

Lombardi, Lucia ^{[3
]}

Tomarchio, Flavia ^{[3
]}

Ferrari, Andrea C. ^{[3
]}

Torrisi, Felice ^{[3
]}

Vitiello, Miriam S. ^{[1
,2
]}

机构：

[1] CNR, Ist Nanosci, NEST, Piazza San Silvestro 12, I-56127 Pisa, Italy

[2] Scuola Normale Super Pisa, Piazza San Silvestro 12, I-56127 Pisa, Italy

[3] Univ Cambridge, Cambridge Graphene Ctr, Cambridge CB3 0FA, England

[4] Univ Leeds, Sch Elect & Elect Engn, Leeds LS2 9JT, W Yorkshire, England

[5] Univ Pisa, Dipartimento Fis, Largo Pontecorvo 3, I-56127 Pisa, Italy

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

基金：

英国工程与自然科学研究理事会;

关键词：

QUANTUM CASCADE LASERS; RAMAN-SCATTERING; PULSE GENERATION; GRAPHENE; ULTRAFAST; SPECTROSCOPY; FEMTOSECOND; ABSORPTION; DYNAMICS; SPECTRUM;

D O I：

10.1038/ncomms15763

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：9

共 69 条

[41]

Li LK, 2014, NAT NANOTECHNOL, V9, P372, DOI [10.1038/nnano.2014.35, 10.1038/NNANO.2014.35]

[42] Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions [J].