Ultra-broadband THz time-domain spectroscopy of common polymers using THz air photonics

D’Angelo, Francesco; Mics, Zoltán; Bonn, Mischa; Turchinovich, Dmitry

doi:10.1364/oe.22.012475

Cited by 136 publications

(69 citation statements)

References 37 publications

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“…Surfactants (for example, sodium deoxycholate, sodium cholate, Triton X-100) and solvents can have absorption coefficients larger than a few cm −1 in the THz region39, and may adversely affect the absorption of THz radiation in GSAs40. Thus, surfactant-free and low boiling point (<80 °C) printable inks must be engineered in order to enable low-temperature (<100 °C) solvent removal.…”

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confidence: 99%

Terahertz saturable absorbers from liquid phase exfoliation of graphite

et al. 2017

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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.

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confidence: 99%

Terahertz saturable absorbers from liquid phase exfoliation of graphite

et al. 2017

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“…Terahertz (THz) waves categorize between the far infrared and millimeter radio waves, which have shown great applications in multiple fields such as THz imaging [1,2], spectroscopy analysis [3,4] and wireless communications [5,6]. However, there exist considerable challenges to develop THz sources with high power density and nanoscale size [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Enhanced plasmonic nanofocusing of terahertz waves in tapered graphene multilayers

Liu¹,

Wang²,

Ke³

et al. 2016

Opt. Express

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We investigate the plasmonic nanofocusing of terahertz waves in tapered graphene multilayers separated by dielectrics. The nanofocusing effect is significantly enhanced in the graphene multilayer taper compared with that in a single layer graphene taper due to interlayer coupling between surface plasmon polaritons. The results are optimized by choosing an appropriate layer number of graphene and the field amplitude has been enhanced by 620 folds at λ = 50 μm. Additionally, the structure can slow light to a group velocity ~1/2815 of the light speed in vacuum. Our study provides a unique approach to compress terahertz waves into deep subwavelength scale and may find great applications in terahertz nanodevices for imaging, detecting and spectroscopy.

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“…However, conflicting results are often published [e.g. [1][2][3][4], and no agreed means exists to validate measurements or to compare results produced by different labs. There are no agreed measurement standards, and a variety of methods are employed in calculating derived parameters, whilst published papers seldom include the details of data analysis.…”

Section: Introductionmentioning

confidence: 99%