Saturation of interband absorption in graphene

Vasko, F. T.

doi:10.1103/physrevb.82.245422

Cited by 61 publications

(42 citation statements)

References 27 publications

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“…With pulsed laser excitation, the band filling (Pauli blocking) effect of the exited carriers can drastically change the absorption spectrum of graphene and lead to saturable absorption of the G/ PVA nanofibers 31,32,36,37 . To investigate this effect, we used fiber tapers Graphene-doped polymer nanofibers C Meng et al 3…”

Section: Resultsmentioning

confidence: 99%

Graphene-doped polymer nanofibers for low-threshold nonlinear optical waveguiding

Meng

Wang

et al. 2015

Light Sci Appl

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Graphene-doped polymer nanofibers are fabricated by taper drawing of solvated polyvinyl alcohol doped with liquid-phase exfoliated graphene flakes. Nanofibers drawn this way typically have diameters measured in hundreds of nanometers and lengths in tens of millimeters; they show excellent uniformity and surface smoothness for optical waveguiding. Owing to their tightly confined waveguiding behavior, light-matter interaction in these subwavelength-diameter nanofibers is significantly enhanced. Using approximately 1350-nm-wavelength femto-second pulses, we demonstrate saturable absorption behavior in these nanofibers with a saturation threshold down to 0.25 pJ pulse 21 (peak power ,1.3 W). Additionally, using 1064-nm-wavelength nanosecond pulses as switching light, we show all-optical modulation of a 1550-nm-wavelength signal light guided along a single nanofiber with a switching peak power of ,3.2 W.

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Section: Resultsmentioning

confidence: 99%

Graphene-doped polymer nanofibers for low-threshold nonlinear optical waveguiding

Meng

Wang

et al. 2015

Light Sci Appl

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“…Note that attempts for realization of the graphene-based laser in the THz and near-IR spectral region were performed during last years. [5][6][7][8][9] Similar investigations in the mid-IR spectral region should be useful for realization of devices in that region.…”

Section: Discussionmentioning

confidence: 99%

“…Lasers for mid-IR and THz regions were realized based on the tunnel-coupled heterostructures (quantum cascade scheme 2 ) or on the p-type bulk materials with the degenerate valence bands. 3 Active studies of graphene, which is a two-dimensional gapless semiconductor with unusual physical characteristics, 4 involve both theoretical investigation of the stimulated emission regime under steady-state or ultrafast pumping 5,6 and experimental attempts -approaches for realization of lasing. Recently, the transformation of the ultrafast optical pumping into THz or near-IR radiation was reported, see Refs.…”

Section: Introductionmentioning

confidence: 99%

Transient stimulated emission from multi-split-gated graphene structure

Satou

Vasko

Otsuji

et al. 2013

J. Phys. D: Appl. Phys.

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Mechanism of transient population inversion in graphene with multi-splitted (interdigitated) topgate and grounded back gate is suggested and examined for the mid-infrared (mid-IR) spectral region. Efficient stimulated emission after fast lateral spreading of carriers due to drift-diffusion processes is found for the case of a slow electron-hole recombination in the passive region. We show that with the large gate-to-graphene distance the drift process always precedes the diffusion process, due to the ineffective screening of the inplane electric field by the gates. Conditions for lasing with a gain above 100 cm −1 are found for cases of single-and multi-layer graphene placed in the waveguide formed by the top and back gates. Both the waveguide losses and temperature effects are analyzed.

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“…Amplification of optical response of the Fresnel system 'graphene-300 nm thick quartz substrate-Si gate' has allowed for making graphene optically visible already in the first work [4] on the problem. An example of applications of unique optical properties of the graphene is fabrication of graphene-based saturable absorbers for ultrafast lasers in the telecommunication region (see [43]). Recently, both the modulation [44] and polarisation [45] of the IR radiation have been observed experimentally in the graphene structure integrated with a waveguide.…”

Section: Modulation Of Near-ir and Mid-ir Radiations Using Graphene-omentioning

confidence: 99%

Non-volatile memory and IR radiation modulators based upon graphene-on-ferroelectric substrate. A review

Стріха¹

2012

Ukr. J. Phys. Opt.

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Abstract. I present a review of both experimental and theoretical studies performed during the recent three years, which deal with the physical properties and possible applications of graphene placed on ferroelectric (organic or Pb(Zr x Ti 1-x )O 3 (PZT) ceramic) substrates. The system 'graphene-on-ferroelectric substrate' has unique advantages in comparison with the graphene deposited on SiO 2 or on dielectrics with high dielectric permittivity. In particular, one can obtain high (~ 10 12 cm -2 ) carrier concentrations in the doped graphene-on-ferroelectric structures for moderate (of the order of 1 V) gate voltages. The existence of a hysteresis (or anti-hysteresis) in the dependence of electrical resistance of graphene channel on the gate voltage facilitates creating bistable systems for different applications. The use of ferroelectric substrates has already enabled developing of robust elements of non-volatile memory of a new generation. These elements operate for more than 10 5 switching cycles and store information for more than 10 3 s. Such systems can be characterised theoretically by ultrafast switching rates (~ 10-100 fs). A theoretical analysis has also demonstrated that the structures 'graphene-on-PZT ferroelectric substrate' would result in developing efficient and fast small-sized modulators of mid-IR and near-IR radiations for different optoelectronic applications.

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Saturation of interband absorption in graphene

Cited by 61 publications

References 27 publications

Graphene-doped polymer nanofibers for low-threshold nonlinear optical waveguiding

Graphene-doped polymer nanofibers for low-threshold nonlinear optical waveguiding

Transient stimulated emission from multi-split-gated graphene structure

Non-volatile memory and IR radiation modulators based upon graphene-on-ferroelectric substrate. A review

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