Z-scan measurement of the nonlinear refractive index of monolayer WS_2

Zheng, Xin; Zhang, Yangwei; Chen, Runze; Cheng, Xina; Xu, Zhongjie; Jiang, Tian

doi:10.1364/oe.23.015616

Cited by 129 publications

(59 citation statements)

References 28 publications

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“…The nonlinear refraction is paramount at the boundaries of the anomalous dispersion region (see Table 3 for extracted maximum values) and weakens as the driving frequency further departs from resonance. We find that the n 2 values of the RPP flakes near resonance are three to four orders of magnitude higher than those of typical optical switching materials such as GaAs (3.25 × 10 −17 m 2 W −1 ) and Si (4.5 × 10 −18 m 2 W −1 ), and comparable to or higher than those of other 2D materials (refer to Table for comparison with other 2D materials) …”

Section: The Electronic (Eg) and Optical (Enormalgopt) Bandgaps Of Thmentioning

confidence: 66%

Giant and Tunable Optical Nonlinearity in Single‐Crystalline 2D Perovskites due to Excitonic and Plasma Effects

et al. 2019

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Materials with large optical nonlinearity, especially in the visible spectral region, are in great demand for applications in all‐optical information processing and quantum optics. 2D hybrid Ruddlesden−Popper‐type halide perovskites (RPPs) with tunable ultraviolet‐to‐visible direct bandgaps exhibit large nonlinear optical responses due to the strong excitonic effects present in their multiple quantum wells. Using a microscopic Z‐scan setup with femtosecond laser pulses tunable across the visible spectrum, it is demonstrated that single‐crystalline lead halide RPP nanosheets possess unprecedentedly large nonlinear refraction and absorption coefficients near excitonic resonances. A room‐temperature insulator (exciton)–metal (plasma) Mott transition is found to occur near the exciton resonance of the thinnest qunatum‐well RPPs, boosting the nonlinear response. Owing to the rapidly changing refractive index near resonance, a single RPP crystal can exhibit different nonlinear functionalities across the excitation spectrum. The results suggest that RPPs are efficient nonlinear materials in the visible waveband, indicating their potential use in integrated nonlinear photonic applications such as optical modulation and switching.

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Section: The Electronic (Eg) and Optical (Enormalgopt) Bandgaps Of Thmentioning

confidence: 66%

Giant and Tunable Optical Nonlinearity in Single‐Crystalline 2D Perovskites due to Excitonic and Plasma Effects

et al. 2019

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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

409

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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“…Figure A shows a typical saturation absorption of MoS 2 at 1060 nm . Recently, numerous Q‐switch and mode‐locking function were realized with MoS 2 , WS 2 , MoSe 2 , and WSe 2 based SA with wideband, tunable repetition, and tunable pulse duration.…”

Section: Nlo Processes In Tmdsmentioning

confidence: 99%

Nonlinear optics of two‐dimensional transition metal dichalcogenides

Wen

Gong

2019

InfoMat

173

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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Z-scan measurement of the nonlinear refractive index of monolayer WS_2

Cited by 129 publications

References 28 publications

Giant and Tunable Optical Nonlinearity in Single‐Crystalline 2D Perovskites due to Excitonic and Plasma Effects

Giant and Tunable Optical Nonlinearity in Single‐Crystalline 2D Perovskites due to Excitonic and Plasma Effects

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

Nonlinear optics of two‐dimensional transition metal dichalcogenides

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