Third order nonlinear optical response exhibited by mono- and few-layers of WS
                    <sub>2</sub>

Torres-Torres, C.; Perea-López, Néstor; Elías, Ana Laura; Gutiérrez, Humberto; Cullen, David A.; Berkdemir, Ayşe; López–Urías, Florentino; Terrones, Humberto; Terrones, Mauricio

doi:10.1088/2053-1583/3/2/021005

Cited by 60 publications

(39 citation statements)

References 30 publications

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“…Such a high n2 for the GO films highlights their strong Kerr nonlinearity not only for FWM but also other third-order ( (3) ) nonlinear processes such as SPM and cross phase modulation (XPM), and possibly even enhancing  (3) for THG and stimulated Raman scattering [13,24,46,64]. We observe that n2 (both at 12 dBm and 18 dBm) decreases with GO layer number, similar to the trend observed for layered WS2 films measured by a spatial-light system [65]. In our case, this was probably a result of an increase in inhomogeneous defects within the GO layers as well as imperfect contact between the multiple GO layers.…”

Section: Nonlinear Parameter ( γ ) Of the Hybrid Waveguides And N2 Ofsupporting

confidence: 79%

Enhanced 3 rd order optical nonlinearity in silicon nitride nanowires integrated with 2D graphene oxide films

Moss¹,

Qu²,

Wu³

et al. 2020

Preprint

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numbers of GO layers and at different pump powers. By optimizing the trade-off between the nonlinearity and loss, we obtain a significant improvement in the FWM conversion efficiency of ≈7.3 dB for a uniformly coated device with 1 layer of GO and ≈9.1 dB for a patterned device with 5 layers of GO. We also obtain a significant increase in FWM bandwidth for the patterned devices. A detailed analysis of the influence of pattern length and position on the FWM performance is performed. Based on the FWM measurements, the dependence of GO’s third-order nonlinearity on layer number and pump power is also extracted, revealing interesting physical insights about the 2D layered GO films. Finally, we obtain an enhancement in the effective nonlinear parameter of the hybrid waveguides by over a factor of 100. These results verify the enhanced nonlinear optical performance of SiN waveguides achievable by incorporating 2D layered GO films.

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Section: Nonlinear Parameter ( γ ) Of the Hybrid Waveguides And N2 Ofsupporting

confidence: 79%

Enhanced 3 rd order optical nonlinearity in silicon nitride nanowires integrated with 2D graphene oxide films

Moss¹,

Qu²,

Wu³

et al. 2020

Preprint

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“…n 2 (both at 12 and 22 dBm) decreases with GO layer number, showing a similar trend to WS 2 measured by a spatial‐light system. [ 68 ] This is probably due to increased inhomogeneous defects within the GO layers as well as imperfect contact between the multiple GO layers. We also note that the decrease in n 2 with GO layer number becomes more gradual for thicker GO films.…”

Section: Theoretical Analysis and Discussionmentioning

confidence: 99%

2D Layered Graphene Oxide Films Integrated with Micro‐Ring Resonators for Enhanced Nonlinear Optics

Yang

et al. 2020

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Layered 2D graphene oxide (GO) films are integrated with micro‐ring resonators (MRRs) to experimentally demonstrate enhanced nonlinear optics. Both uniformly coated (1−5 layers) and patterned (10−50 layers) GO films are integrated on complementary‐metal‐oxide‐semiconductor (CMOS)‐compatible doped silica MRRs using a large‐area, transfer‐free, layer‐by‐layer GO coating method with precise control of the film thickness. The patterned devices further employ photolithography and lift‐off processes to enable precise control of the film placement and coating length. Four‐wave‐mixing (FWM) measurements for different pump powers and resonant wavelengths show a significant improvement in efficiency of ≈7.6 dB for a uniformly coated device with 1 GO layer and ≈10.3 dB for a patterned device with 50 GO layers. The measurements agree well with theory, with the enhancement in FWM efficiency resulting from the high Kerr nonlinearity and low loss of the GO films combined with the strong light–matter interaction within the MRRs. The dependence of GO's third‐order nonlinearity on layer number and pump power is also extracted from the FWM measurements, revealing interesting physical insights about the evolution of the GO films from 2D monolayers to quasi bulk‐like behavior. These results confirm the high nonlinear optical performance of integrated photonic resonators incorporated with 2D layered GO films.

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“…Their electronic and optical properties have been extensively studied since the discovery of the direct band gap in monolayer MoS 2 in 2010 1,2 , as understanding light-matter interactions in TMD monolayers is essential for developing applications in electronics, photonics, and optoelectronics. So far, ultrafast excitonic dynamics 3 , coupled spin-valley physics 4,5 , large exciton binding energies 6,7 , and nonlinear optical responses [8][9][10][11] in TMD monolayers have been well studied. It has been also shown that van der Waals heterostructures with different TMD monolayers can be constructed 12 to realize devices with multiple functionalities.…”

Section: Introductionmentioning

confidence: 99%

Strong and anisotropic third-harmonic generation in monolayer and multilayer ReS2

et al. 2017

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We report observation of strong and anisotropic third harmonic generation (THG) in monolayer and multilayer ReS 2 . The third-order nonlinear optical susceptibility of monolayer ReS 2 , χ (3) is on the order of 10 −18 m 2 /V 2 , which is about one order of magnitude higher than reported results for hexagonal-lattice transition metal dichalcogenides such as MoS 2 . A similar magnitude for the third-order nonlinear optical susceptibility was also obtained for a multilayer sample. The intensity of the THG field was found to be dependent on the direction of the incident light polarization for both monolayer and multilayer samples. A point group symmetry analysis shows that such anisotropy is not expected from a perfect 1T lattice, and must arise from the distortions in the ReS 2 lattice. Our results show that THG measurements can be used to characterize lattice distortions of two-dimensional materials, and that lattice distortions are important for the nonlinear optical properties of such materials.

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Third order nonlinear optical response exhibited by mono- and few-layers of WS ₂

Cited by 60 publications

References 30 publications

Enhanced 3 rd order optical nonlinearity in silicon nitride nanowires integrated with 2D graphene oxide films

Enhanced 3 rd order optical nonlinearity in silicon nitride nanowires integrated with 2D graphene oxide films

2D Layered Graphene Oxide Films Integrated with Micro‐Ring Resonators for Enhanced Nonlinear Optics

Strong and anisotropic third-harmonic generation in monolayer and multilayer ReS2

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Third order nonlinear optical response exhibited by mono- and few-layers of WS 2

Cited by 60 publications

References 30 publications

Enhanced 3 rd order optical nonlinearity in silicon nitride nanowires integrated with 2D graphene oxide films

Enhanced 3 rd order optical nonlinearity in silicon nitride nanowires integrated with 2D graphene oxide films

2D Layered Graphene Oxide Films Integrated with Micro‐Ring Resonators for Enhanced Nonlinear Optics

Strong and anisotropic third-harmonic generation in monolayer and multilayer ReS2

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Third order nonlinear optical response exhibited by mono- and few-layers of WS ₂