Laser induced white lighting of graphene foam

Stręk, W.; Tomala, Robert; Łukaszewicz, Mikołaj; Cichy, Bartłomiej; Gerasymchuk, Yuriy; Głuchowski, Paweł; Marciniak, Ł.; Bednarkiewicz, Artur; Hreniak, D.

doi:10.1038/srep41281

Cited by 78 publications

(72 citation statements)

References 34 publications

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“…The principal advantage for such a success would be the simultaneous measurements of the photon's absorption and emission spectra in different layers of the BLG. The results of the presented paper are particularly important in the context of the recent experimental results [52,53] concerning the discovery of the laser-induced white light emission spectra in graphene ceramics. It was demonstrated in Ref.…”

Section: Resultsmentioning

confidence: 95%

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Spectral properties of excitons in the bilayer graphene

Apinyan

Kopeć

2018

Physica E: Low-dimensional Systems and Nanostructures

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In this paper, we consider the spectral properties of the bilayer graphene with the local excitonic pairing interaction between the electrons and holes. We consider the generalized Hubbard model, which includes both intralayer and interlayer Coulomb interaction parameters. The solution of the excitonic gap parameter is used to calculate the electronic band structure, single-particle spectral functions, the hybridization gap, and the excitonic coherence length in the bilayer graphene. We show that the local interlayer Coulomb interaction is responsible for the semimetal-semiconductor transition in the double layer system, and we calculate the hybridization gap in the band structure above the critical interaction value. The formation of the excitonic band gap is reported as the threshold process and the momentum distribution functions have been calculated numerically. We show that in the weak coupling limit the system is governed by the Bardeen-Cooper-Schrieffer (BCS)-like pairing state. Contrary, in the strong coupling limit the excitonic condensate states appear in the semiconducting phase, by forming the Dirac's pockets in the reciprocal space.PACS numbers: 68.65. Pq, 73.22.Pr, 73.22.Gk, 71.35.Lk, 71.10.Li, 78.67.Wj, 73.30.+y INTRODUCTIONThe electronic band gap of semiconductors and insulators largely determines their optical, transport properties and governs the operation of semiconductor based devices such as p-n junctions, transistors, photodiodes and lasers [1]. Opening up a band gap in the bilayer graphene (BLG), by applying the external electric field and finding a suitable substrate are two challenges for constituting the modern nano-electronic equipment [2,3]. The imposition of external electrical field can tune the bilayer graphene from the semimetal to the semiconducting state [2]. On the other hand, the possibility of formation of the excitonic insulator state and the excitonic condensation in the bilayer graphene structures remains controversial in the modern solid state physics [4][5][6][7][8][9][10][11][12][13][14]. In difference with the quasi two-dimensional (2D) semiconducting systems, where those two states have been observed experimentally and well discussed theoretically [15][16][17][18][19][20][21][22][23][24][25][26][27], the formation of the excitonic condensate states in the BLG system, from the original electron-hole pairing states, is much more obscure because of the complicated nature of the single-particle correlations in these systems [6,8,10,13,14]. The weak correlation diagrammatic mechanism, discussed in the Refs.13, 14, is restricted only to the closed loop expansion in the diagrammatic series, and in this case, only the density fluctuation effects could affect the formation of the excitonic condensate states. Meanwhile, it has been shown [28][29][30] that even the undoped graphene can provide a variety of electron-hole type pairing chiral symmetry breaking * Corresponding author. Tel.: +48 71 3954 284; E-mail address: v.apinyan@int.pan.wroc.pl.orders especially for the strong C...

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Section: Resultsmentioning

confidence: 95%

“…It was demonstrated in Ref. [52] that a large bandgap opening and light emission from graphene is possible by using the continuous-wave laser beams with wavelengths from the visible to the nearinfrared range. This hidden multistability of graphene is fundamental to create a semiconducting phase immersed in the semimetallic continuum one.…”

Section: Resultsmentioning

confidence: 99%

Spectral properties of excitons in the bilayer graphene

Apinyan

Kopeć

2018

Physica E: Low-dimensional Systems and Nanostructures

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“…In addition, BP and other narrow bandgap 2DLMs can be potentially used for infrared light generation (e.g., via harmonic generation and differential DFG). It is worth noting that white light emission in graphene has been demonstrated with continuous wave and ultrafast pulsed light pumping. Photon emission is generated typically throughout the visible spectral range with energies both larger and lower than the exciting one, in contrast with conventional PL processes .…”

Section: Perspectives Of 2dlm‐based Nonlinear Opticsmentioning

confidence: 99%

Nonlinear Optics with 2D Layered Materials

et al. 2018

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2D layered materials (2DLMs) are a subject of intense research for a wide variety of applications (e.g., electronics, photonics, and optoelectronics) due to their unique physical properties. Most recently, increasing research efforts on 2DLMs are projected toward the nonlinear optical properties of 2DLMs, which are not only fascinating from the fundamental science point of view but also intriguing for various potential applications. Here, the current state of the art in the field of nonlinear optics based on 2DLMs and their hybrid structures (e.g., mixed-dimensional heterostructures, plasmonic structures, and silicon/fiber integrated structures) is reviewed. Several potential perspectives and possible future research directions of these promising nanomaterials for nonlinear optics are also presented.

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“…The weight of empty vessel was about 2 g. The vessels were filled with suspension of dispersed graphene foam particles (GF) of the sizes 1-10 µm in methanol (30 mg/cm 3 ). The GF particles were obtained by using the method described in 19 . Morphology of the sample was analyzed using Jeol JSM-6610LVnx scanning electron microscope (SEM).…”

Section: Methodsmentioning

confidence: 99%

Direct light-induced propulsion of vessels filled with a suspension of graphene particles and methanol

Stręk

Wiewiórski

Miśta

et al. 2020

Sci Rep

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The direct propulsion of glassy capsule filled with solution of methanol and disperse graphene foam (GF) particles under irradiation with infrared LED is reported. The vertical propulsion occurred after irradiation of transparent glassy bottom. The velocity of propulsion was dependent of light irradiation power. It was observed that with irradiation the GF particles moved violently and vertically with direction of lighting. It was found that upon light irradiation there is generated efficiently hydrogen upon solution surface. The mechanism of propulsion effect was discussed in terms of the explosive hydrogen-oxygen reaction.Recently Zhang et al. 1 have reported a laser-induced propulsion (LIP) of a bulk graphene sponge in vacuum. The horizontal and vertical propulsion or rotation of bulk graphene was dependent on laser light wavelength and laser power density. The observed phenomenon was discussed in terms of electron emission giving input to kinetic energy of graphene sponge. The authors 1 have suggested the potential application of LIP effect for space transportation. As another mechanism for laser light propulsion on a basis of classical arguments was proposed by Lei Wu et al. 2 in the correspondence to the Editor. Following the estimation of propulsion force provided by light-induced ejected electrons to be too small than opposite gravitational force they have pointed on the radiometric force of Reynolds 3 to be responsible for the effect. The propulsion caused by radiometric force is due to the difference of temperature at the bottom and the top of laser illuminated graphene sponge bulk. In the reply to the correspondence by Wu et al. Zhang et al. 4 have supplied additional strong arguments to emphasize the role of hot ejected electrons for laser induced movement of bulk graphene sponge. The phenomena of laser induced propulsion was a subject of many investigations [5][6][7][8][9][10][11][12][13][14][15] . A review of different nanoscale photo-and redox -driven artificial molecular motors was recently presented by Baroncini et al. 16 . The light driven levitation of graphene sponge was discussed by Gabor 6 . Laser initiated water vapor propulsion as drive for space vehicles was presented Minami and Uchida 8 . The discussion of application of physical mechanisms for photonic space propulsion was discussed by Levchenko et al. 9 . Propulsion of glass micro-spheres irradiated by nanosecond laser pulses were discussed by Yu et al. 11 . The studies of underwater laser propulsion of metallic target materials was reported Qiang et al. 10 . The propulsion mechanism for catalytic microjet engines used in microrobotics was proposed by Fomin et al. 17 . Application of laser-driven propulsion of graphene flakes for microjet engines was investigated by Chengbin Qin et al. 18 .In present work we report the observation of light-induced propulsion of massive glass vessel (capsule) filled with suspension of methanol with dispersed fine graphene foam (GF) particles. The capsule was illuminated with CW infrared light emitting...

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Laser induced white lighting of graphene foam

Cited by 78 publications

References 34 publications

Spectral properties of excitons in the bilayer graphene

Spectral properties of excitons in the bilayer graphene

Nonlinear Optics with 2D Layered Materials

Direct light-induced propulsion of vessels filled with a suspension of graphene particles and methanol

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