Transition from saturable absorption to reverse saturable absorption in MoTe2 nano-films with thickness and pump intensity

Quan, Chenjing; He, Minmin; He, Chuan; Huang, Yuanyuan; Zhu, Lihua; Yao, Zehan; Xu, Xiang; Lu, Chunhui; Xu, Xinlong

doi:10.1016/j.apsusc.2018.06.245

Cited by 57 publications

(30 citation statements)

References 49 publications

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“…In addition, the two‐photon absorption response of WS 2 and WSe 2 films was also discovered, as shown in Figure d–f. Recently, more TMDCs including MS 2 , MSe 2 , MTe 2 , have been also deeply studied. These explorations lay a foundation for their applications in nonlinear photonics.…”

Section: Fundamental Of 2d Layered Materialsmentioning

confidence: 99%

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

Guo

Xiao

Wang

et al. 2019

Laser & Photonics Reviews

420

197

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In recent years, 2D layered materials, including graphene, topological insulators, transition metal dichalcogenides, black phosphorus, MXenes, graphitic carbon nitride, and metal‐organic frameworks, have attracted considerable interest due to their potential applications in the fields of physics, chemistry, biology, and energy. Their rise in the field of nonlinear photonics began around 2009 and has become an important research direction. Here, the synthesis techniques, nonlinear optical properties, integration strategies, and device applications of layered materials are reviewed. In terms of nonlinear optical properties, the focus is on saturable absorption and Kerr nonlinearity. On this basis, their applications in various pulsed lasers, including fiber lasers, solid‐state lasers, waveguide lasers, and related nonlinear optical phenomenon, are summarized. In addition, novel optical devices using layered materials, such as optical modulators, optical polarizers, optical switchers, and even all‐optical device, are also involved. It is believed that the development of 2D layered materials in the field of photonics will continue to deepen, thus laying a good foundation for its practical application.

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Section: Fundamental Of 2d Layered Materialsmentioning

confidence: 99%

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

Guo

Xiao

Wang

et al. 2019

Laser & Photonics Reviews

420

197

View full text Add to dashboard Cite

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“…[20,35] The beam radius is ≈30 µm, which was measured by the scanning knife-edge technique. [20,35] The beam radius is ≈30 µm, which was measured by the scanning knife-edge technique.…”

Section: Nonlinear Optical Propertymentioning

confidence: 99%

“…[20,35] The beam radius is ≈30 µm, which was measured by the scanning knife-edge technique. According to Equation S2 in the Supporting Information, the imaginary part of third-order nonlinear susceptibility (Im (3) χ ) of the MoTe 2 /MoS 2 nanocomposite film is −6.88 × 10 −9 esu, which is much larger than those of MoTe 2 nanofilms (−6.19 to −7.39) × 10 −15 esu, [35] MoTe 2 dispersion −2.13 × 10 −15 esu, and MoSe 2 dispersion −1.45 × 10 −15 esu. According to Equation S2 in the Supporting Information, the imaginary part of third-order nonlinear susceptibility (Im (3) χ ) of the MoTe 2 /MoS 2 nanocomposite film is −6.88 × 10 −9 esu, which is much larger than those of MoTe 2 nanofilms (−6.19 to −7.39) × 10 −15 esu, [35] MoTe 2 dispersion −2.13 × 10 −15 esu, and MoSe 2 dispersion −1.45 × 10 −15 esu.…”

Section: Nonlinear Optical Propertymentioning

confidence: 99%

“…The Imχ (3) for MoTe 2 /MoS 2 nanocomposite films are in the range of (−4.85 to −7.02) × 10 −9 esu and FOM is in the range of (6.46-11.6) × 10 −14 esu cm. [35,46] The density of grain boundary of MoTe 2 /MoS 2 nanocomposite films increases with increasing the film thickness. [20] The weak thickness dependence could come from the density of localized defect states on grain boundary and interlayer coupling.…”

Section: Nonlinear Optical Propertymentioning

confidence: 99%

“…The stronger saturable absorption is observed in MoTe 2 /MoS 2 heterostructure film compared with that of pure MoTe 2 and MoS 2 nanofilms at the same condition. [35] Monolayer MoS 2 has a direct bandgap of ≈1.88 eV, while the bulk has an indirect bandgap of ≈1.29 eV. It is found that the interlayer transition from MoTe 2 /MoS 2 heterojunction plays an important role in the nonlinear optical enhancement.…”

Section: Introductionmentioning

confidence: 95%

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Band Alignment of MoTe₂/MoS₂ Nanocomposite Films for Enhanced Nonlinear Optical Performance

Quan

et al. 2019

Adv Materials Inter

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Band alignment is a key issue for the optoelectronics based on 2D layered transition metal dichalcogenides (TMDs) heterostructures. Herein, band alignment of MoTe2/MoS2 mixed heterostructure is measured with high‐resolution X‐ray photoelectron spectroscopy. The MoTe2/MoS2 heterostructure belongs to type‐II heterostructure with the conduction band offset of 0.46 eV and the valence band offset of 0.9 eV. The stronger saturable absorption is observed in MoTe2/MoS2 heterostructure film compared with that of pure MoTe2 and MoS2 nanofilms at the same condition. An energy‐level model combined with Runge–Kutta algorithm is used to understand the enhancement mechanism. It is found that the interlayer transition from MoTe2/MoS2 heterojunction plays an important role in the nonlinear optical enhancement. Meanwhile, band structure of MoTe2/MoS2 heterostructure is calculated by the first principles. The contributions of the MoTe2 and MoS2 to the heterojunction are almost equal and the valence band maximum and conduction band minimum exist in MoTe2 and MoS2 separately. This structure can form the interlayer carriers easily. The results suggest that the band alignment of TMDs paves the way for the type‐II heterostructure for enhanced nonlinear response in the development of optical modulator, ultrafast laser mode lockers, saturable absorbers, and optical switches.

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High‐Order Shift Current Induced Terahertz Emission from Inorganic Cesium Bromine Lead Perovskite Engendered by Two‐Photon Absorption

Huang

et al. 2019

Adv Funct Materials

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High-order nonlinear optical phenomena are interesting from a fundamental point of view as they reveal intrinsic symmetries of the materials. Potentially they can also be used for practical optoelectronic applications. High-order shift current is one of these phenomena, and yet it has never been detected in experiments, primarily due to the difficulty in conventional contact detection. In this work, the shift current due to the two-photon absorption (TPA) from all-inorganic perovskite CsPbBr 3 is first observed by a contactless and nondestructive terahertz (THz) emission method. The results reveal that the THz emission is dominated by a high-order shift current (fourth-order nonlinear optical effect) with the below-bandgap photon energy of femtosecond laser excitation. The high-order shift current origins from the broken inversion symmetry induced by the dynamic stereochemical activity of the Pb 2+ lone pair. A microscopic TPA-assisted nonlinear optical model is presented to describe the photophysical process of the THz emission. The model matches well with the quadratic pump fluence and angular dependence of the THz emission. This work can not only open a new venue for the all-inorganic perovskite-based nonlinear optoelectronics and THz devices, but also afford a THz technology for the high-order nonlinear effect analysis.

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Transition from saturable absorption to reverse saturable absorption in MoTe2 nano-films with thickness and pump intensity

Cited by 57 publications

References 49 publications

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

Band Alignment of MoTe₂/MoS₂ Nanocomposite Films for Enhanced Nonlinear Optical Performance

High‐Order Shift Current Induced Terahertz Emission from Inorganic Cesium Bromine Lead Perovskite Engendered by Two‐Photon Absorption

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Transition from saturable absorption to reverse saturable absorption in MoTe2 nano-films with thickness and pump intensity

Cited by 57 publications

References 49 publications

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

Band Alignment of MoTe2/MoS2 Nanocomposite Films for Enhanced Nonlinear Optical Performance

High‐Order Shift Current Induced Terahertz Emission from Inorganic Cesium Bromine Lead Perovskite Engendered by Two‐Photon Absorption

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Band Alignment of MoTe₂/MoS₂ Nanocomposite Films for Enhanced Nonlinear Optical Performance