Characterization of the second- and third-order nonlinear optical susceptibilities of monolayer MoS
                    <sub>2</sub>
                    using multiphoton microscopy

Woodward, Robert I.; Murray, R.; Phelan, C. F.; Oliveira, Rafael E. P. de; Runcorn, T. H.; Kelleher, E. J. R.; Li, S; Oliveira, Emerson Cruz de; Fechine, Guilhermino J. M.; Eda, Goki; Matos, Christiano J. S. de

doi:10.1088/2053-1583/4/1/011006

Cited by 166 publications

(133 citation statements)

References 42 publications

(90 reference statements)

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“…The angle dependence of THG is totally different to SHG. For the monolayer TMDs with D 3 h space group, the polarization of THG signal is always same with the excitation polarization, independent on the orientation of the monolayer crystal (Figure F) . Another important point is that THG would vanish under circularly polarized light (CPL) excitation .…”

Section: Nlo Processes In Tmdsmentioning

confidence: 93%

“…SHG of the bulk MoS 2 is very weak and χ (2) is around 10 −14 m/V; however, three groups simultaneously reported that SHG of monolayer MoS 2 , WS 2 , and WSe 2 increased dramatically . Later, numerous SHG studies were conducted on MoS 2 , WS 2 , WSe 2 , MoSe 2 , and MoTe 2 , and χ (2) was reported on the order of magnitude of 1 nm/V, which is much higher than the most used commercial nonlinear crystals (eg, χ (2) of BBO, KTP, and LiNbO 3 are on the order of magnitude of pm/V). The large nonlinear susceptibility of monolayer compared with bulk is ascribed to the inversion symmetry breaking.…”

Section: Nlo Processes In Tmdsmentioning

confidence: 99%

“…Both THG and FWM are originated from the third‐order susceptibility χ (3) . THG has been widely investigated in MoS 2 , WS 2 , WSe 2 ,and MoSe 2 . In contrast to SHG, THG does not require the absence of the inversion symmetry and can be observed both in odd‐ and even‐layers.…”

Section: Nlo Processes In Tmdsmentioning

confidence: 99%

“… χ (3) of all MoS 2 , WS 2 , WSe 2 , and MoSe 2 were estimated to around 1 × 10 −19 m 2 /V 2 . There are two methods to estimate χ (3) .…”

Section: Nlo Processes In Tmdsmentioning

confidence: 99%

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Nonlinear optics of two‐dimensional transition metal dichalcogenides

Wen

Gong

2019

InfoMat

180

156

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Nonlinear optics (NLO) of transition metal dichalcogenides (TMDs) is promising for the on‐chip photonic and optoelectronic applications. In this review, we will survey the current progress of NLO in TMDs. First, we will brief the basic theory of the NLO in TMDs. Second, several important nonlinear processes in TMDs such as harmonic generation, four‐wave mixing, saturable absorption, and two‐photon absorption will be presented and their potential applications are also discussed. Third, the main strategies to tune, modulate, and enhance the NLO in TMDs are reviewed, including the excitonic effect, symmetry modulation, optical cavity enhancement, valley selection, edge state, and material phase. Finally, we give an outlook regarding some important issues and directions of NLO in TMDs.

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Section: Nlo Processes In Tmdsmentioning

confidence: 93%

Section: Nlo Processes In Tmdsmentioning

confidence: 99%

Section: Nlo Processes In Tmdsmentioning

confidence: 99%

“… χ (3) of all MoS 2 , WS 2 , WSe 2 , and MoSe 2 were estimated to around 1 × 10 −19 m 2 /V 2 . There are two methods to estimate χ (3) .…”

Section: Nlo Processes In Tmdsmentioning

confidence: 99%

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Nonlinear optics of two‐dimensional transition metal dichalcogenides

Wen

Gong

2019

InfoMat

180

156

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“…Different non-linear optical phenomena like second-, third-harmonic generation and four wave mixing (FWM) [5][6][7] can be quite strong in these materials [8][9][10][11][12][13][14][15]. However, the interpretation of the nonlinear optical response is strongly affected by electronic and phonon resonances [16][17][18][19], therefore the knowledge of the interplay between these resonances is desirable.…”

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confidence: 99%

Anomalous Nonlinear Optical Response of Graphene Near Phonon Resonances

et al. 2017

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In this work we probe the third-order non-linear optical property of graphene, hexagonal boron nitride and their heterostructure by the use of coherent anti-Stokes Raman Spectroscopy. When the energy difference of the two input fields match the phonon energy, the anti-Stokes emission intensity is enhanced in h-BN, as usually expected while for graphene a anomalous decrease is observed. This behaviour can be understood in terms of q coupling between the electronic continuum and a discrete phonon state. We have also measured a graphene/h-BN heterostructure and demonstrate that the anomalous effect in graphene dominates the heterostructure optical response.Two-dimensional materials like graphene, hexagonal boron nitride (h-BN) and heterostructures exibit novel physical properties and promisses different applications in electronics and photonics [1][2][3][4]. Different non-linear optical phenomena like second-, third-harmonic generation and four wave mixing (FWM) [5][6][7] can be quite strong in these materials [8][9][10][11][12][13][14][15]. However, the interpretation of the nonlinear optical response is strongly affected by electronic and phonon resonances [16][17][18][19], therefore the knowledge of the interplay between these resonances is desirable.Here we measured the third order optical emission by the degenerated four wave mixing emission of graphene, h-BN and their heterostructure near phonon resonances. We show that while the FWM signal in h-BN shows the expected enhancement, in graphene the signal is decreased exactly at the phonon resonance. These results are explained in terms of interference effects between the electronic continuum and discrete phonon states for these two different materials. We also show that this unusual effect in graphene dominates the optical response in the graphene/h-BN heterostructure.Four wave mixing is a third-order non-linear optical phenomena, where three frequencies are combined to generate a forth [7]. In this work we are restricted to the case of degenerate FWM, where two photons of frequency ω 1 combines with a photon of ω 2 at the material and generate the emission of another photon with frequency ω 4 . The energy conservation in this case is given by ω 4 = 2 ω 1 − ω 2 . Hendry et al. [8] have measured the FWM intensity in graphene as a function of the pump laser energy and its third order optical non linear optical property was characterized. Also different theoretical works have calculated the third-order optical conductivity of graphene [20][21][22][23], showing the importance of different physical quantities like Fermi energy or temperature. However these works did not treat the problem of the third order optical nonlinearity near phonon resonances. The so-called coherent anti-Stokes Raman spectroscopy (CARS) is a special case of FWM when the energy difference between ω 1 and ω 2 matches a phonon energy ( ω ph ), then ω 4 corresponds exactly to the anti-Stokes frequency in Raman scattering. In general, when the energy condition ω 1 − ω 2 = ω ph is satisfied, the ω ...

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Second‐Harmonic and Third‐Harmonic Generations in2DLayered Materials

Jin,

Zhao

2023

Two‐Dimensional Materials for Nonlinear Optics

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Characterization of the second- and third-order nonlinear optical susceptibilities of monolayer MoS ₂ using multiphoton microscopy

Abstract: Characterization of the second-and third-order nonlinear optical susceptibilities of monolayer MoS 2 ... Supplementary Information forCharacterization of the second-and third-order nonlinear optical susceptibilities of monolayer MoS 2 using multiphoton microscopy

Cited by 166 publications

References 42 publications

Nonlinear optics of two‐dimensional transition metal dichalcogenides

Nonlinear optics of two‐dimensional transition metal dichalcogenides

Anomalous Nonlinear Optical Response of Graphene Near Phonon Resonances

Second‐Harmonic and Third‐Harmonic Generations in2DLayered Materials

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Characterization of the second- and third-order nonlinear optical susceptibilities of monolayer MoS 2 using multiphoton microscopy

Abstract: Characterization of the second-and third-order nonlinear optical susceptibilities of monolayer MoS 2 ... Supplementary Information forCharacterization of the second-and third-order nonlinear optical susceptibilities of monolayer MoS 2 using multiphoton microscopy

Cited by 166 publications

References 42 publications

Nonlinear optics of two‐dimensional transition metal dichalcogenides

Nonlinear optics of two‐dimensional transition metal dichalcogenides

Anomalous Nonlinear Optical Response of Graphene Near Phonon Resonances

Second‐Harmonic and Third‐Harmonic Generations in2DLayered Materials

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Characterization of the second- and third-order nonlinear optical susceptibilities of monolayer MoS ₂ using multiphoton microscopy