Broadband saturable absorption and optical limiting in graphene-polymer composites

Husaini, Saima; Slagle, Jonathan E.; Murray, Joel M.; Guha, Shekhar; Gonzalez, Leonel P.; Bedford, Robert

doi:10.1063/1.4805060

Cited by 51 publications

(29 citation statements)

References 24 publications

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“…17 In ns regime, the thermally induced nonlinear scattering will cause optical limiting at an input fluence of $0.5 J/cm 2 or irradiance intensity of $1 GW/cm 2 . 16 While in our experiments, the largest input fluence and the highest irradiance intensity are 0.045 J/cm 2 and 10 MW/cm 2 , respectively, which is far below the above irradiance levels, so we have not observed the optical limiting, or to say, the thermally induced scattering. In Ref.…”

mentioning

confidence: 88%

Dependence of the saturable absorption of graphene upon excitation photon energy

Zhang

Han

Liu

et al. 2015

Applied Physics Letters

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Using an optical parametric oscillation laser as the excitation source, the dependence of the saturable absorption of multiple-layer graphene upon photon energy is investigated and, in all cases, the saturation intensity is lower for lower excitation photon energy. This result experimentally proves the hourglass shape of the energy band of graphene, which is a well-known theoretical deduction from first principles. The modulation depth increases from 1.5% to 5.1% when the layer number increases from a monolayer to 5–7 layers and, at the same time, the saturation intensity decreases with increasing number of layers. The results demonstrate that, as a saturable absorber of a pulsed laser, graphene can more easily achieve optical modulation in the low energy region, i.e., the infrared waveband.

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confidence: 88%

Dependence of the saturable absorption of graphene upon excitation photon energy

Zhang

Han

Liu

et al. 2015

Applied Physics Letters

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“…We recently demonstrated a linearly polarized 1180 nm passively mode-locked Raman fiber laser [24] and an all-polarization maintaining Q-switching Yb-doped fiber laser using graphene-based saturable absorber [25]. Graphene-PVA solution composite prepared by Husaini et al [26] have been studied at 785 nm and 1064 nm in the ns and ps temporal regimes, respectively. The authors found that the output uence readily clamped with increasing input fluence and graphene concentration, due to nonlinear absorption and scattering.…”

Section: Introductionmentioning

confidence: 99%

Saturable absorption behavior of free-standing graphene polymer composite films over broad wavelength and time ranges

et al. 2015

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A comparative research on saturable absorption (SA) behavior dependence on wavelength and pulse duration was performed for graphene polymer composites. Free-standing graphene-polyvinyl alcohol (PVA) composite films were fabricated by using solution cast method in combination of liquid phase exfoliation. SA responses were observed by using an open-aperture Z-scan technique for 340 fs pulses at 1030 nm and 515 nm from a mode-locked fiber laser, and 6 ns pulses at 1064 nm and 532 nm from a Q-switched Nd:YAG laser. The graphene films possess better SA property, i.e., larger SA coefficient and figure of merit (FOM), and lower saturation intensity I(s), for ns pulses than that for fs pulses at the similar near infrared (NIR) wavelength. For fs pulses, the films show better SA response at 1030 nm than that at 515 nm. By employing slow and fast SA modelling, the excited state and ground state absorption cross sections were estimated to be ~10(-17) cm(2), and the ratio was ~0.6 at NIR for both fs and ns pulses.

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“…The increase of absorption at shorter wavelengths is attributed to the existence of an absorption peak at 270 nm due to the π-π transitions of the C = C bonds in the aromatic ring of graphene 39 42 . At the same time, Er-GO and GO-triangular Pd showed enhanced 2PA behavior compared with pure GO 24, 43 due to the nonlinear scattering introduced by thermal effects and microplasmas under the excitation of a nanosecond laser.…”

Section: Discussionmentioning

confidence: 98%

“…05~0.4 cm/GW)39 . Due to the different experimental conditions, the calculated 2PA coefficient of graphene reported by Anand et.…”

mentioning

confidence: 98%

Optical Limiting of Carboxyl–Graphene Oxide

Zhang

Wang

et al. 2017

IEEE J. Select. Topics Quantum Electron.

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Using the Z-scan method, the nonlinear optical (NLO) absorption property of carboxyl-functionalized graphene oxide (GO) was researched for the first time. The strong optical limiting (OL) effect was found in carboxyl-GO, which can be attributed to the two-photon absorption (2PA). At 532 nm excitation condition, the threshold of optical limiting behavior is only 8% of that at 1064 nm excitation, and the saturable intensity I s as well as the 2PA coefficient β 2 are 1.31 GW/cm 2 , 0.17 cm/GW, respectively. It indicates that carboxyl-GO is an excellent nano-material for optical limiting application, especially in short wavelength scope.

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Broadband saturable absorption and optical limiting in graphene-polymer composites

Cited by 51 publications

References 24 publications

Dependence of the saturable absorption of graphene upon excitation photon energy

Dependence of the saturable absorption of graphene upon excitation photon energy

Saturable absorption behavior of free-standing graphene polymer composite films over broad wavelength and time ranges

Optical Limiting of Carboxyl–Graphene Oxide

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