Direct electrical modulation of second-order optical susceptibility via phase transitions

Wang, Ying; Xiao, Jun; Chung, Ting-Fung; Nie, Zhaoyu; Yang, Sui; Zhang, Xiang

doi:10.1038/s41928-021-00655-0

Cited by 29 publications

(30 citation statements)

References 33 publications

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“…Nonlinear optical (NLO) effects in two-dimensional (2D) van der Waals (vdW) materials have attracted tremendous attention, leading to potential applications in modern on-chip nanophotonics. − The 2D vdW materials, featuring inversion symmetry breaking at the atomic level, express large second-order nonlinear susceptibility with relaxed phase-matching conditions and highly tunable optical nonlinearity. − Thus far, significant progress has been made to improve second-harmonic generation (SHG), a crucial NLO process that generates an output beam with a doubled frequency, in 2D vdW materials by the introduction of electric fields, chemical doping, and strain. ,− However, fundamental questions exist and need to be addressed to improve materials design principles toward excellent NLO properties. For example, it has been shown that structural distortion considerably affects the SHG response, , yet without a systematic investigation of the structure–property correlation.…”

Section: Introductionmentioning

confidence: 99%

Manipulating Peierls Distortion in van der Waals NbOX₂ Maximizes Second-Harmonic Generation

Sun

et al. 2023

J. Am. Chem. Soc.

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Two-dimensional (2D) van der Waals (vdW) materials, featuring relaxed phase-matching conditions and highly tunable optical nonlinearity, endow them with potential applications in nanoscale nonlinear optical (NLO) devices. Despite significant progress, fundamental questions in 2D NLO materials remain, such as how structural distortion affects second-order NLO properties, which call for advanced regulation and in situ diagnostic tools. Here, by applying pressure to continuously tune the displacement of Nb atoms in 2D vdW NbOI 2 , we effectively modulate the polarization and achieve a 3-fold boost of the secondharmonic generation (SHG) at 2.5 GPa. By introducing a Peierls distortion parameter, λ, we establish a quantitative relationship between λ and SHG intensity. Importantly, we further demonstrate that the SHG enhancement can be achieved under ambient conditions by anionic substitution to tune the distortion in NbO(I 1−x Br x ) 2 (x = 0−1) compounds, where the chemical tailoring simulates the pressure effects on the structural optimization. Consequently, NbO(I 0.60 Br 0.40 ) 2 with λ = 0.17 exhibits a giant SHG of over 2 orders of magnitude higher than that in monolayer WSe 2 , reaching the record-high value among reported 2D vdW NLO materials. This work unambiguously demonstrates the correlation between Peierls distortion and SHG property and, more broadly, opens new paths for the development of advanced NLO materials by manipulating the structure distortions.

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Section: Introductionmentioning

confidence: 99%

Manipulating Peierls Distortion in van der Waals NbOX₂ Maximizes Second-Harmonic Generation

Sun

et al. 2023

J. Am. Chem. Soc.

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“…Besides the aforementioned material systems, EFISH has also been observed in other systems, such as in WSe 2 monolayer transistors, due to the strong exciton charging effects 109 at a graphene oxide heterointerface, 110 and in monolayer MoTe 2 due to electrically induced phase transition. 111 Electrically tunable third-harmonic generation was also observed through the tuning of the Fermi level. 112 ■ NON-HERMITIAN METASURFACES Lowering Spatial and Time-Reversal Symmetry.…”

Section: ■ Nonlinear Metasurfacesmentioning

confidence: 99%

Emerging Trend in Unconventional Metasurfaces: From Nonlinear, Non-Hermitian to Nonclassical Metasurfaces

Fan

Liang

et al. 2022

ACS Photonics

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Metasurfaces, benefiting from the flexibility in engineering the resonance, near-field, symmetry, and scattering properties of individual building blocks, are promising not only for a wide range of practical applications in the classical linear optical regime, but also facilitate research into new unconventional areas. Very recently, we have been witnessing the second quantum revolution in which quantum information processing and computation are becoming a reality. In this review, we will focus on some of the emerging developments of metasurfaces that work in the nonlinear, non-Hermitian, nonclassical, or quantum regime. We review some of the common principles shared by the development of these metasurfaces, including local field enhancement and the consideration of structure, lattice, and time-reversal symmetries.

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“…Two-dimensional (2D) van der Waals (vdW) semiconductors have attractive application prospects in the fields of nanophotonics and optoelectronics owing to their special advantages in the optical modulation of nanodevices caused by high flexibility and integration of optoelectronic properties. − By the modulation of vdW engineering ( e.g. , interlayer stacking − or twisting − ) or external fields, − the highly tunable nonlinear optical (NLO) properties, − e.g. , second harmonic generation (SHG) effect, of these materials are appealing for potential optoelectronic applications ( e.g.…”

Section: Introductionmentioning

confidence: 99%

Sliding Modulation in Nonlinear Optical Effect in Two-Dimensional van der Waals Cu₂MoS₄

Liang

Kang

et al. 2022

ACS Appl. Mater. Interfaces

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Owing to different nonlinear optical (NLO) motifs with diverse structural and symmetrical assemblies, two-dimensional (2D) van der Waals (vdW) transition metal ternary chalcogenides (TMTCs) have unique advantages in nano-NLO modulation compared to 2D vdW transition metal dichalcogenides (e.g., MoS2). Based on first-principles calculations, in this study, we discover that layered Cu2MoS4 with two tetrahedral [MoS4] and [CuS4] motifs, as a representative 2D vdW TMTC, has an extremely rare sliding-modulated second harmonic effect with nearly 70% fluctuation, much larger than 5% in MoS2 with a single octahedral [MoS6] motif because of different synergistic effects among intra- and interlayer NLO polarizations induced by the [CuS4] and [MoS4] NLO-active motifs. Furthermore, the Cu2MoS4 layers exhibit a low energy barrier in interlayer sliding with a robust SHG response against large strains, displaying a novel and applicable NLO-modulation mechanism in nano-optoelectronics.

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Direct electrical modulation of second-order optical susceptibility via phase transitions

Cited by 29 publications

References 33 publications

Manipulating Peierls Distortion in van der Waals NbOX₂ Maximizes Second-Harmonic Generation

Manipulating Peierls Distortion in van der Waals NbOX₂ Maximizes Second-Harmonic Generation

Emerging Trend in Unconventional Metasurfaces: From Nonlinear, Non-Hermitian to Nonclassical Metasurfaces

Sliding Modulation in Nonlinear Optical Effect in Two-Dimensional van der Waals Cu₂MoS₄

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Direct electrical modulation of second-order optical susceptibility via phase transitions

Cited by 29 publications

References 33 publications

Manipulating Peierls Distortion in van der Waals NbOX2 Maximizes Second-Harmonic Generation

Manipulating Peierls Distortion in van der Waals NbOX2 Maximizes Second-Harmonic Generation

Emerging Trend in Unconventional Metasurfaces: From Nonlinear, Non-Hermitian to Nonclassical Metasurfaces

Sliding Modulation in Nonlinear Optical Effect in Two-Dimensional van der Waals Cu2MoS4

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Product

Resources

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Manipulating Peierls Distortion in van der Waals NbOX₂ Maximizes Second-Harmonic Generation

Manipulating Peierls Distortion in van der Waals NbOX₂ Maximizes Second-Harmonic Generation

Sliding Modulation in Nonlinear Optical Effect in Two-Dimensional van der Waals Cu₂MoS₄