Dispersion of the nonlinear susceptibility of 
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 and 
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 from second-harmonic scattering spectroscopy

Bredillet, Kévin; Riporto, Jérémy; Forcherio, Gregory T.; Dunklin, Jeremy R.; Wolf, Jean‐Pierre; Bonacina, Luigi; Mugnier, Yannick; Dantec, Ronan Le

doi:10.1103/physrevb.102.235408

Cited by 10 publications

(12 citation statements)

References 45 publications

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“…To quantify the optical nonlinearity of the nanocomposite, we first calibrated the SHG response using a monolayer 2H-WS 2 sample as a reference (a highly noncentrosymmetric material with high second-order nonlinear optical susceptibility) . Here, single crystal WS 2 is mechanically exfoliated onto the SiO 2 /Si substrate, and the second-order nonlinear optical susceptibility |χ (2) | is calculated to be ∼1.2 nm/V, showing good agreement with the previous experimental result. , SHG yield of our h-BN/c-BN nanocomposite is comparable to that of the monolayer 2H-WS 2 (Figure b), with an SHG intensity ratio P c‑BN/h‑BN : P WS2 ∼ 1:2. The effective interaction length of forward-propagating SHG inside the sample is d = 1 Δ k = λ S H G 2 π false( n S H G − n p u m p false) ∼ 300 nm, where Δ k is the phase mismatch due to the difference in refractive indices (RI) at the pump ( n pump ) and SHG ( n SHG ) frequencies. , Thus, we estimate that the lower bound of the effective second-order nonlinear susceptibility |χ (2) | in the composite is about of ∼3 pm/V.…”

supporting

confidence: 80%

“…45 Here, single crystal WS 2 is mechanically exfoliated onto the SiO 2 /Si substrate, and the second-order nonlinear optical susceptibility |χ (2) | is calculated to be ∼1.2 nm/V, showing good agreement with the previous experimental result. 45,46 SHG yield of our h-BN/c-BN nanocomposite is comparable to that of the monolayer 2H-WS 2 (Figure 3b), with an SHG intensity ratio P c-BN/h-BN :P WS2 ∼ 1:2. The effective interaction length of forward-propagating SHG inside the sample is d = ∼ 300 nm, where Δk is the phase mismatch due to the difference in refractive indices (RI) at the pump (n pump ) and SHG (n SHG ) frequencies.…”

mentioning

confidence: 53%

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Phase Stability of Hexagonal/Cubic Boron Nitride Nanocomposites

Biswas,

Xu,

Christiansen-Salameh

et al. 2023

Nano Lett.

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Boron nitride (BN) is an exceptional material, and among its polymorphs, two-dimensional (2D) hexagonal and three-dimensional (3D) cubic BN (h-BN and c-BN) phases are most common. The phase stability regimes of these BN phases are still under debate, and phase transformations of h-BN/c-BN remain a topic of interest. Here, we investigate the phase stability of 2D/3D h-BN/c-BN nanocomposites and show that the coexistence of two phases can lead to strong nonlinear optical properties and low thermal conductivity at room temperature. Furthermore, spark-plasma sintering of the nanocomposite shows complete phase transformation to 2D h-BN with improved crystalline quality, where 3D c-BN possibly governs the nucleation and growth kinetics. Our demonstration might be insightful in phase engineering of BN polymorph-based nanocomposites with desirable properties for optoelectronics and thermal energy management applications.

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supporting

confidence: 80%

mentioning

confidence: 53%

Phase Stability of Hexagonal/Cubic Boron Nitride Nanocomposites

Biswas,

Xu,

Christiansen-Salameh

et al. 2023

Nano Lett.

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“…[ 262–265 ] These bound excitons influence nonlinear light matter interactions. [ 41,209,266–268 ] For example, in 1L MoS 2 , significant enhancement in SHG and THG is found when in resonance with an A‐exciton [ 269 ] and a similar trend is noted for an SHG investigation with WS 2 . [ 270 ] The strong exciton effects in 2D materials due to large density of states increase the efficiency of generating OHG.…”

Section: Tuning Of Optical Harmonic Generation In 2d Layered Materialsmentioning

confidence: 77%

Optical Harmonic Generation in 2D Materials

Khan

Zhang

Ishfaq

et al. 2021

Adv Funct Materials

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2D materials are emerging as ideal candidates for fundamental investigations and new technologies due to their unique optoelectronic properties. Giant nonlinear susceptibility and perfect phase matching in 2D materials lead to extraordinary nonlinear light matter interactions, thus enabling several potential applications and fundamental scientific discoveries in nonlinear optics. For instance, second harmonic generation in 2D materials play an important role in optical devices such as, lasers, tunable waveguides, electro‐optic modulators, and switches. This review will discuss optical harmonic generation (OHG) processes, various characterization modes, and tuning techniques in 2D materials. The future prospectives for OHG in 2D materials is discussed. The extremely promising attributes of combining nonlinear optics and 2D materials is becoming a highly important multidisciplinary field.

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“…Note that we only used diluted samples to limit the absorption of the fundamental beam and reabsorption of the generated 2ω photons within the suspension. Moreover, the incident power was limited to 50 mW to prevent the occurrence of thermal lensing, which could induce self-defocusing of the fundamental beam, thereby modifying its intensity . We addressed both of these concerns in the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

Black Gold Plasmon Response of a Raspberry Shell Grown on Lithium Niobate Nonlinear Nanoparticles

Bredillet,

Behel,

Taitt

et al. 2023

J. Phys. Chem. C

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Lithium niobate nanoparticles (LN NPs) coated with a raspberry-like gold (Au) shell are synthesized herein. The strong plasmon resonance coupling between Au NPs in raspberry nanostructures is expected to modify the surface and cavity optical fields and thus significantly alter the second harmonic (SH) signal generated by the noncentrosymmetric crystalline core of LN. Plasmonic properties of the core−shell NPs are first modeled using the discrete-dipole approximation method. The influence of the size and filling fraction of Au NPs on the extinction cross section is correlated with the experimental responses. Comparison at 800 nm of the first hyperpolarizability of individual Au NPs, bare LN cores, and hybrid nanostructures demonstrates no enhancement. It reveals instead an octupolar response in the polarization-resolved data, consistent with a dominant surface contribution of the raspberry-like Au shell. The wavelength-dependent SH emission of the hybrid nanostructures is finally determined in the 700−1300 nm excitation range, and a continuous increase that reaches a factor up to 20 is only evidenced at the longest excitation wavelength of 1300 nm.

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Dispersion of the nonlinear susceptibility of MoS2 and WS2 from second-harmonic scattering spectroscopy

Cited by 10 publications

References 45 publications

Phase Stability of Hexagonal/Cubic Boron Nitride Nanocomposites

Phase Stability of Hexagonal/Cubic Boron Nitride Nanocomposites

Optical Harmonic Generation in 2D Materials

Black Gold Plasmon Response of a Raspberry Shell Grown on Lithium Niobate Nonlinear Nanoparticles

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