All-optical control of ultrafast photocurrents in unbiased graphene

Obraztsov, Petr A.; Kaplas, Tommi; Garnov, S. V.; Kuwata‐Gonokami, Makoto; Obraztsov, A. N.; Svirko, Yuri

doi:10.1038/srep04007

Cited by 51 publications

(48 citation statements)

References 32 publications

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“…Dispersion-less absorption, strong optical nonlinearity and pronounced photon drag effect [1][2][3][4] make single-and few-layer graphene as well as ultrathin graphitic films an appealing platform for next generation photonic devices [1][2][3][4][5][6][7][8][9][10]. However, chemical vapor deposition (CVD), which has become a conventional synthesis technique of the sp 2 -hybridized carbon films [11][12][13], requires catalytic transitional metal substrates (e.g.…”

Section: Introductionmentioning

confidence: 99%

Strong optical nonlinearity of ultrathin graphitic films synthesized on dielectric substrates

Kaplas

Babaeian

Cromey

et al. 2019

Applied Surface Science

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We propose and demonstrate a scalable technique to grow a thin polycrystalline graphitic film directly onto a fused silica substrate. The technique is based on the pyrolysis of a photoresist in the presence of a sacrificial 10 nm thick nickel catalyst layer. The synthesized graphitic film with a thickness of about 50 nm possesses almost constant 40% absorptance over visual and near infrared spectral regions. By using Raman characterization, third harmonic generation spectroscopy, and the Z-scan technique we perform a comparative study of the films pyrolyzed with and without a Ni catalyst. We show that the amorphous carbon dominates the linear and nonlinear optical properties of the resist film pyrolyzed without the Ni catalyst. In contrast, in presence of a Ni catalyst layer, the pyrolysis leads to a graphitic film that demonstrates a strong saturable absorption behavior at 1550 nm wavelength and has a nonlinear refractive index comparable with that of graphene. Thus, the developed, transfer-free synthesis technique provides an alternative route towards the controllable growth of wafer scale graphitic films on the dielectric substrates for photonics applications.

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Section: Introductionmentioning

confidence: 99%

Strong optical nonlinearity of ultrathin graphitic films synthesized on dielectric substrates

Kaplas

Babaeian

Cromey

et al. 2019

Applied Surface Science

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“…[] and resulted in the observation of ballistic photocurrents in multilayer epitaxial graphene. The time resolved photon drag effect due to interband optical transitions has been reported in Refs …”

Section: Photon Drag Effectmentioning

confidence: 94%

Terahertz Electric Field Driven Electric Currents and Ratchet Effects in Graphene

2017

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Terahertz field induced photocurrents in graphene were studied experimentally and by microscopic modeling. Currents were generated by cw and pulsed laser radiation in large area as well as small-size exfoliated graphene samples. We review general symmetry considerations leading to photocurrents depending on linear and circular polarized radiation and then present a number of situations where photocurrents were detected. Starting with the photon drag effect under oblique incidence, we proceed to the photogalvanic effect enhancement in the reststrahlen band of SiC and edge-generated currents in graphene. Ratchet effects were considered for in-plane magnetic fields and a structure inversion asymmetry as well as ratchets by non-symmetric patterned top gates. Lastly, we demonstrate that graphene can be used as a fast, broadband detector of terahertz radiation.

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“…Некоторые другие методы получения полуцикловых импульсов аттосекундной длительности обсуждаются в [37,38]. Отметим также возможность экспериментального получения полуцикловых импульсов в терагерцовом диапазоне частот [39][40][41][42].…”

Section: методы формирования и управления формой квазиуниполярных импunclassified

Экстремальная И Топологическая Нелинейная Оптика Открытых Систем

Розанов¹,

Архипов²,

Архипов³

et al. 2019

Журнал Технической Физики

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A review of results of an investigation of the theory of optical wave packets with extreme properties with respect to a controllable pulse shape or to the complexity of the internal structure of radiation beam pulses is presented. Special attention is paid to the manifestations of dissipative effects of the electromagnetic energy inflow and outflow. Precisely these factors lead to peculiar rules of conservation of purely electromagnetic quantities in dissipative media, in which the electromagnetic energy irreversibly decreases in the case of absorption and increases with gain. These rules impose certain restrictions on the possibility of transformation of the shape of pulses and allow one to qualitative describe their evolution. A higher efficiency of the action of unipolar or quasi-unipolar radiation pulses on classical and quantum microobjects is shown and possible ways of formation of these pulses are discussed. For bulk laser media with saturable absorption, the topological properties of localized radiation structures and their transformations with a smooth change in the parameters of the medium (pump level) are described. The preservation of the topological structure upon changes in parameters within the stability range yields the possibility of their distinguishing when coding information by topological solitons of the considered type.

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All-optical control of ultrafast photocurrents in unbiased graphene

Cited by 51 publications

References 32 publications

Strong optical nonlinearity of ultrathin graphitic films synthesized on dielectric substrates

Strong optical nonlinearity of ultrathin graphitic films synthesized on dielectric substrates

Terahertz Electric Field Driven Electric Currents and Ratchet Effects in Graphene

Экстремальная И Топологическая Нелинейная Оптика Открытых Систем

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