Enhanced second-harmonic generation from two-dimensional MoSe2 by waveguide integration

Chen, Haitao; Corboliou, Vincent; Solntsev, Alexander S.; Choi, Duk Yong; Vincenti, Maria Antonietta; Ceglia, Domenico de; Angelis, C. De; Yuerui, Lu; Nneshev, Dragomir N. Neshev

doi:10.1364/cleo_qels.2017.fm2f.4

Cited by 4 publications

(5 citation statements)

References 2 publications

(3 reference statements)

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“…As shown in Fig. 4(a), by covering the MoSe 2 layers on top of a silicon waveguide, second harmonic generation from 1550 to 775 nm was observed [80]. The results show a five times enhancement of second harmonic generation compared to the case with only MoSe 2 thin layers, demonstrating that the effective nonlinear interaction length is amplified by the silicon waveguide.…”

Section: A Utilization Of Layered Materials With Parametric Nonlineamentioning

confidence: 76%

“…Since the absorption rate and the free carrier induced refractive index change are relevant to the light intensity, the transmission of one mode can be controlled or modified by another light mode [89]. [84,85] χ 2 χ 2 6 × 10 −11 C SHG, laser Emission spectrum when excited from grating and free space (right) [80]. (b) Scanning electron micrograph of the fabricated silicon photonic crystal cavity with monolayer WSe 2 on top, indicated by the orange outline.…”

Section: B Utilization Of Layered Materials With Light Absorptionmentioning

confidence: 99%

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Hybrid silicon nonlinear photonics [Invited]

Zhang

Tong

et al. 2018

Photon. Res.

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Nonlinear silicon photonics has shown an ability to generate, manipulate, and detect optical signals on an ultracompact chip at a potential low cost. There are still barriers hindering its development due to essential material limitations. In this review, hybrid structures with some specific materials developed for nonlinear silicon photonics are discussed. The combination of silicon and the nonlinear materials takes advantage of both materials, which shows great potential to improve the performance and expand the applications for nonlinear silicon photonics.

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Section: A Utilization Of Layered Materials With Parametric Nonlineamentioning

confidence: 76%

Section: B Utilization Of Layered Materials With Light Absorptionmentioning

confidence: 99%

Hybrid silicon nonlinear photonics [Invited]

Zhang

Tong

et al. 2018

Photon. Res.

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“…Further improvement is possible by improving the cavity Q-factor, and reducing the mode-volume, which is often very large in Fabry-Perot cavities. Phase-matched second-harmonic generation was also recently reported in a silicon photonic waveguide using MoSe2 [86]. By engineering the waveguide cross-section, the effective mode-indices of the fundamental and second-harmonic modes are matched which ensures the phase-matching of the light at the fundamental and second harmonic frequencies.…”

Section: Second Harmonic Generation With Double Mode Cavitymentioning

confidence: 91%

Cavity nonlinear optics with layered materials

2017

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Abstract:Unprecedented material compatibility and ease of integration, in addition to the unique and diverse optoelectronic properties of layered materials, have generated significant interest in their utilization in nanophotonic devices. While initial nanophotonic experiments with layered materials primarily focused on light sources, modulators, and detectors, recent efforts have included nonlinear optical devices. In this paper, we review the current state of cavity-enhanced nonlinear optics with layered materials. Along with conventional non linear optics related to harmonic generation, we report on emerging directions of nonlinear optics, where layered materials can potentially play a significant role.

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“…usually exhibt an indirect-to-direct bandgap transition as well as bandgap increases when the materials become thinner. This property means that TMDCs have an adjustable bandgap for optoelectronic applications [9]. In addition, as the Coulomb screening effect becomes weaker, the exciton binding energy will be much larger in 2D materials than that in bulk phases.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure evolution and exciton energy shifting dynamics in WSe₂: from monolayer to bulk

Chen¹,

Wang²,

Wang³

et al. 2021

J. Phys. D: Appl. Phys.

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Exciton related processes in two-dimensional (2D) transition metal dichalcogenides (TMDCs) play important roles in their optoelectronic applications. In this work, through broadband transient absorption spectroscopy, the electronic band structure evolution, exciton energy shifting dynamics and power-dependence spectral characteristics of WSe2 layers, including monolayer, bilayer, tri-layer and bulk WSe2 under 400 nm and 800 nm excitations are investigated. Particularly, under 400 nm excitation, due to the hot-exciton effect, the A-exciton energy shifting dynamics in WSe2 layers have been analysized in detail, where thicker WSe2 samples possess slower hot-exciton cooling lifetimes, and the exciton recombination approaches are affected by the band structure and interlayer interactions, in comparison with that under 800 nm excitation. The power-dependence spectral evolution in WSe2 layers suggests that the charged states like trions could be facilitated in tri-layer WSe2 (or thicker samples) at the same experimantal conditions. These findings in WSe2 layers could provide a deep insight into the hot-exciton related processes in 2D TMDCs from transient experiments ponit of view.

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Enhanced second-harmonic generation from two-dimensional MoSe2 by waveguide integration

Abstract: We demonstrate enhanced second-harmonic generation from a monolayer MoSe 2 through Si waveguide integration. This is achieved by exciting the monolayer through the guided mode, which dramatically increases the interaction length and allows for phasematching.

Cited by 4 publications

References 2 publications

Hybrid silicon nonlinear photonics [Invited]

Hybrid silicon nonlinear photonics [Invited]

Cavity nonlinear optics with layered materials

Electronic structure evolution and exciton energy shifting dynamics in WSe₂: from monolayer to bulk

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Enhanced second-harmonic generation from two-dimensional MoSe2 by waveguide integration

Abstract: We demonstrate enhanced second-harmonic generation from a monolayer MoSe 2 through Si waveguide integration. This is achieved by exciting the monolayer through the guided mode, which dramatically increases the interaction length and allows for phasematching.

Cited by 4 publications

References 2 publications

Hybrid silicon nonlinear photonics [Invited]

Hybrid silicon nonlinear photonics [Invited]

Cavity nonlinear optics with layered materials

Electronic structure evolution and exciton energy shifting dynamics in WSe2: from monolayer to bulk

Contact Info

Product

Resources

About

Electronic structure evolution and exciton energy shifting dynamics in WSe₂: from monolayer to bulk