Second Harmonic and Sum-Frequency Generations from a Silicon Metasurface Integrated with a Two-Dimensional Material

Yuan, Qingchen; Fang, Liang; Fang, Hanlin; Li, Juntao; Wang, Tao; Wang, Jie; Zhao, Jianlin

doi:10.1021/acsphotonics.9b00553

Cited by 69 publications

(51 citation statements)

References 49 publications

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“…Moreover, it is proved that the high-Q resonance can dramatically enhance the intensity of the third harmonic generation (THG) signal. We believe that these results can be not only useful for improving the nonlinear conversion processes 43,44 , but also for lasing and sensing applications.…”

Section: Introductionmentioning

confidence: 85%

High-<i>Q</i> resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces

Fang¹,

Yang²,

Yuan³

et al. 2021

OEA

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The realization of high-Q resonances in a silicon metasurface with various broken-symmetry blocks is reported. Theoretical analysis reveals that the sharp resonances in the metasurfaces originate from symmetry-protected bound in the continuum (BIC) and the magnetic dipole dominates these peculiar states. A smaller size of the defect in the broken-symmetry block gives rise to the resonance with a larger Q factor. Importantly, this relationship can be tuned by changing the structural parameter, resulting from the modulation of the topological configuration of BICs. Consequently, a Q factor of more than 3,000 can be easily achieved by optimizing dimensions of the nanostructure. At this sharp resonance, the intensity of the third harmonic generation signal in the patterned structure can be 368 times larger than that of the flat silicon film. The proposed strategy and underlying theory can open up new avenues to realize ultrasharp resonances, which may promote the development of the potential meta-devices for nonlinearity, lasing action, and sensing.

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Section: Introductionmentioning

confidence: 85%

High-<i>Q</i> resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces

Fang¹,

Yang²,

Yuan³

et al. 2021

OEA

Self Cite

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“…The cross symbol in table I refers to the lack of SHG/THG measurement or no SHG/THG in those references. We note that while the nonlinear emission from monolayer TMDCs coupled to plasmonic 58,59 or dielectric metasurfaces 60 have also been recently studied, our TMDC metasurface offers several fundamental advantages. These include the ability to simultaneously enhance the SHG and THG processes, offering a significantly higher interaction volume for the THG.…”

Section: Discussionmentioning

confidence: 99%

Nonlinear Transition-Metal-Dichalcogenide Metasurfaces

Nauman

Yan

Rahmani

et al. 2020

14th Pacific Rim Conference on Lasers and Electro-Optics (CLEO PR 2020)

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Nonlinear light sources are central to a myriad of applications, driving a quest for their miniaturisation down to the nanoscale. In this quest, nonlinear metasurfaces hold a great promise, as they enhance nonlinear effects through their resonant photonic environment and high refractive index, such as in high-index dielectric metasurfaces.However, despite the sub-diffractive operation of dielectric metasurfaces at the fundamental wave, this condition is not fulfilled for the nonlinearly generated harmonic waves, thereby all nonlinear metasurfaces to date emit multiple diffractive beams. Here, we demonstrate the enhanced single-beam second-and third-harmonic generation in a metasurface of crystalline transition-metal-dichalcogenide material, offering the highest refractive index. We show that the interplay between the resonances of the metasurface allows for tuning of the unidirectional second-harmonic radiation in forward or backward direction, not possible in any bulk nonlinear crystal. Our results open new opportunities for metasurface-based nonlinear light-sources, including nonlinear mirrors and entangled-photon generation.

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“…Such layered materials can be readily transferred to patterned dielectric structures with simple dry-transfer or chemical-vapor deposition techniques. Figure 21g-i shows one such hybrid integration of 2D material with silicon metasurface [119]. Multi-layer Gallium selenide dry-transferred onto asymmetric silicon resonant metasurface are utilized for resonant enhancement of second-harmonic and sum-frequency generation from the 2D material layer.…”

Section: Nonlinear Optics With Hybrid Metasurfacementioning

confidence: 99%

Nonlinear Optics in Dielectric Guided-Mode Resonant Structures and Resonant Metasurfaces

et al. 2020

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Nonlinear optics is an important area of photonics research for realizing active optical functionalities such as light emission, frequency conversion, and ultrafast optical switching for applications in optical communication, material processing, precision measurements, spectroscopic sensing and label-free biological imaging. An emerging topic in nonlinear optics research is to realize high efficiency optical functionalities in ultra-small, sub-wavelength length scale structures by leveraging interesting optical resonances in surface relief metasurfaces. Such artificial surfaces can be engineered to support high quality factor resonances for enhanced nonlinear optical interaction by leveraging interesting physical mechanisms. The aim of this review article is to give an overview of the emerging field of nonlinear optics in dielectric based sub-wavelength periodic structures to realize efficient harmonic generators, wavelength mixers, optical switches etc. Dielectric metasurfaces support the realization of high quality-factor resonances with electric field concentrated either inside or in the vicinity of the dielectric media, while at the same time operate at high optical intensities without damage. The periodic dielectric structures considered here are broadly classified into guided-mode resonant structures and resonant metasurfaces. The basic physical mechanisms behind guided-mode resonances, electromagnetically-induced transparency like resonances and bound-states in continuum resonances in periodic photonic structures are discussed. Various nonlinear optical processes studied in such structures with example implementations are also reviewed. Finally, some future directions of interest in terms of realizing large-area metasurfaces, techniques for enhancing the efficiency of the nonlinear processes, heterogenous integration, and extension to non-conventional wavelength ranges in the ultra-violet and infrared region are discussed.

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Second Harmonic and Sum-Frequency Generations from a Silicon Metasurface Integrated with a Two-Dimensional Material

Cited by 69 publications

References 49 publications

High-<i>Q</i> resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces

High-<i>Q</i> resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces

Nonlinear Transition-Metal-Dichalcogenide Metasurfaces

Nonlinear Optics in Dielectric Guided-Mode Resonant Structures and Resonant Metasurfaces

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