Application of Second Harmonic Generation in Characterization of 2D Materials

Xia, Fangfang; Wang, Fakun; Hu, Hailong; Xu, Xiang; Li, Yang; Zhai, Tianrui

doi:10.15541/jim20210074

Cited by 13 publications

(4 citation statements)

References 55 publications

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“…Thereinto, SHG refers to the output signal with frequency doubling of an incident light field, which usually appears in materials with broken inversion symmetry. From a structural symmetry perspective, traditional TMDs stacking in the 2H phase, characterized by alternating orientations along the c -axis, show layer-dependent variations in SHG response . However, TMDs with T-polytype structure inherently exhibit no NLO process owing to their centrosymmetric configurations.…”

Section: Resultsmentioning

confidence: 99%

“…From a structural symmetry perspective, traditional TMDs stacking in the 2H phase, characterized by alternating orientations along the caxis, show layer-dependent variations in SHG response. 54 However, TMDs with T-polytype structure inherently exhibit no NLO process owing to their centrosymmetric configurations. Traditional AA stacked T-TaS 2 , which is centrosymmetric and belongs to space group P3̅ m1, exhibits no SHG response (Figure S13a).…”

Section: Resultsmentioning

confidence: 99%

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Phase and Composition Engineering of Self-Intercalated 2D Metallic Tantalum Sulfide for Second-Harmonic Generation

Han,

et al. 2024

ACS Nano

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Self-intercalation in two-dimensional (2D) materials is significant, as it offers a versatile approach to modify material properties, enabling the creation of interesting functional materials, which is essential in advancing applications across various fields. Here, we define ic-2D materials as covalently bonded compounds that result from the selfintercalation of a metal into layered 2D compounds. However, precisely growing ic-2D materials with controllable phases and self-intercalation concentrations to fully exploit the applications in the ic-2D family remains a great challenge. Herein, we demonstrated the controlled synthesis of self-intercalated H-phase and T-phase Ta 1+x S 2 via a temperature-driven chemical vapor deposition (CVD) approach with a viable intercalation concentration spanning from 10% to 58%. Atomic-resolution scanning transmission electron microscopy-annular dark field imaging demonstrated that the self-intercalated Ta atoms occupy the octahedral vacancies located at the van der Waals gap. The nonperiodic Ta atoms break the centrosymmetry structure and Fermi surface properties of intrinsic TaS 2 . Therefore, ic-2D T-phase Ta 1+x S 2 consistently exhibit a spontaneous nonlinear optical (NLO) effect regardless of the sample thickness and self-intercalation concentrations. Our results propose an approach to activate the NLO response of centrosymmetric 2D materials, achieving the modulation of a wide range of optoelectronic properties via nonperiodic self-intercalation in the ic-2D family.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Phase and Composition Engineering of Self-Intercalated 2D Metallic Tantalum Sulfide for Second-Harmonic Generation

Han,

et al. 2024

ACS Nano

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“…SHG represents the fundamental nonlinear course wherein an incident wave with frequency ω comes into contact with one nonlinear material, resulting in an emergent wave of double frequency 2 ω [ 2 ]. This distinctive phenomenon has been observed in noncentrosymmetric media under intense light fields [ 3 , 4 , 5 , 6 ] and garnered significant interest in photonic and optoelectronic device applications [ 7 , 8 ], materials characterization [ 9 , 10 ], and optical frequency converters [ 11 , 12 ]. The Kurtz–Perry powder technique can evaluate second harmonic generation (SHG) intensity in pristine powder form, saving a significant amount of time and energy in the preliminary screening of materials [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…Several reviews have been conducted on the nonlinear optical properties of LDMs [ 3 , 4 , 26 , 27 ], with a few recent papers offering in-depth discussions specifically on the SHG in 2D materials [ 28 , 29 , 30 ]. In this paper, we provide a thorough review of recent advancements in the investigation of highly efficient and adjustable SHG processes in LDMs.…”

Section: Introductionmentioning

confidence: 99%

Optical Second Harmonic Generation of Low-Dimensional Semiconductor Materials

Fu,

Liu,

Yue

et al. 2024

Nanomaterials

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In recent years, the phenomenon of optical second harmonic generation (SHG) has attracted significant attention as a pivotal nonlinear optical effect in research. Notably, in low-dimensional materials (LDMs), SHG detection has become an instrumental tool for elucidating nonlinear optical properties due to their pronounced second-order susceptibility and distinct electronic structure. This review offers an exhaustive overview of the generation process and experimental configurations for SHG in such materials. It underscores the latest advancements in harnessing SHG as a sensitive probe for investigating the nonlinear optical attributes of these materials, with a particular focus on its pivotal role in unveiling electronic structures, bandgap characteristics, and crystal symmetry. By analyzing SHG signals, researchers can glean invaluable insights into the microscopic properties of these materials. Furthermore, this paper delves into the applications of optical SHG in imaging and time-resolved experiments. Finally, future directions and challenges toward the improvement in the NLO in LDMs are discussed to provide an outlook in this rapidly developing field, offering crucial perspectives for the design and optimization of pertinent devices.

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Superior Nonlinear Optical Response in Non‐Centrosymmetric Stacking Edge‐Rich Spiral MoTe₂ Nanopyramids

Ouyang

Tong

Liu

et al. 2022

Adv Funct Materials

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Transition metal dichalcogenides (TMDs) are of great promise for various nonlinear optical (NLO) applications due to their unique electronic and optoelectronic properties, such as tunable optical bandgap, strong spin-orbit coupling, and exciton effects. However, the desired NLO performances of regular 2H-TMDs are usually restricted by their limited absorption at atomic thickness. With this regard, a structurally novel spiral MoTe 2 (s-MoTe 2 ) nanopyramids is reported with unique and superior NLO response, enabled by their broken inversion symmetry, weak interlayer coupling, exciton resonance, and strong light-matter interaction from the edge-rich 3R-like quasi-multilayer structure. The excellent NLO response over a wide spectral range from the near-infrared to visible region is demonstrated, where second-and third-order NLO responses have been simultaneously observed. Moreover, the secondorder nonlinear susceptibility of s-MoTe 2 is estimated to be around 1-2 order(s) of magnitude larger than those of most reported TMDs. The demonstration of a superior NLO response in such s-MoTe 2 not only paves a new way for designing the best NLO TMD structures, but also greatly prompts their practical applications in micro-nano NLO devices on chips in future.

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Application of Second Harmonic Generation in Characterization of 2D Materials

Cited by 13 publications

References 55 publications

Phase and Composition Engineering of Self-Intercalated 2D Metallic Tantalum Sulfide for Second-Harmonic Generation

Phase and Composition Engineering of Self-Intercalated 2D Metallic Tantalum Sulfide for Second-Harmonic Generation

Optical Second Harmonic Generation of Low-Dimensional Semiconductor Materials

Superior Nonlinear Optical Response in Non‐Centrosymmetric Stacking Edge‐Rich Spiral MoTe₂ Nanopyramids

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Application of Second Harmonic Generation in Characterization of 2D Materials

Cited by 13 publications

References 55 publications

Phase and Composition Engineering of Self-Intercalated 2D Metallic Tantalum Sulfide for Second-Harmonic Generation

Phase and Composition Engineering of Self-Intercalated 2D Metallic Tantalum Sulfide for Second-Harmonic Generation

Optical Second Harmonic Generation of Low-Dimensional Semiconductor Materials

Superior Nonlinear Optical Response in Non‐Centrosymmetric Stacking Edge‐Rich Spiral MoTe2 Nanopyramids

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About

Superior Nonlinear Optical Response in Non‐Centrosymmetric Stacking Edge‐Rich Spiral MoTe₂ Nanopyramids