Efficient Second‐Harmonic Generation from Silicon Slotted Nanocubes with Bound States in the Continuum

Fang, Cizhe; Yang, Qingxiang; Yuan, Qingchen; Gu, Linpeng; Gan, Xuetao; Shao, Yufeng; Liu, Yan; Han, Genquan; Hao, Yue

doi:10.1002/lpor.202100498

Cited by 45 publications

(22 citation statements)

References 65 publications

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“…In recent years, there have also been many studies showing SHG in Si metasurfaces based on enhanced surface χ (2) effect, with normalized efficiency ranging from 10 À9 to 10 À4 W À1 . [50][51][52][53] SHG conversion efficiency of strained Si metasurfaces can be further enhanced by designing resonance modes with higher Q-factors, such as the ones based on Fanoresonances or bound states in the continuum. [54,55]…”

Section: Resultsmentioning

confidence: 99%

Second‐Harmonic Generation in Strained Silicon Metasurfaces

Zhao

Jia

Wang

et al. 2022

Advanced Photonics Research

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Dielectric metasurfaces supporting Mie resonances can allow significantly boosted and tailored nonlinear light–matter interactions at the nanoscale. However, nonlinear dielectric metasurfaces typically only have odd‐order nonlinearities, unless resorting to material systems such as GaAs, GaP, or LiNbO3, each with unique challenges in device fabrication and integration. As the most widely adopted constituent material of metasurfaces, silicon (Si) does not possess an intrinsic second‐order nonlinear susceptibility. Herein, second‐harmonic generation (SHG) in a Si metasurface strained by a silicon nitride (SiN x ) cladding layer is demonstrated. Utilizing the stress caused by the SiN x layer to break the inversion symmetry of the bulk Si crystal, greatly enhanced SHG in the strained Si metasurface compared with that from an unpatterned Si film with the SiN x cladding layer, with an experimentally measured conversion efficiency as high as 4.2 × 10−5 W−1, is observed. Experiments are further performed and it is concluded that the enhanced SHG is most likely due to the applied stress instead of charged defects in the SiN x cladding. This work opens a new route to realizing dielectric metasurfaces with second‐order nonlinearity in a complementary metal–oxide–semiconductor (CMOS)‐compatible platform.

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Section: Resultsmentioning

confidence: 99%

Second‐Harmonic Generation in Strained Silicon Metasurfaces

Zhao

Jia

Wang

et al. 2022

Advanced Photonics Research

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“…These modes have infinite quality factors (Q factors) and cannot be excited from the external radiative continuum, thereby providing efficient ways to trap light and to enhance light–matter interactions [ 3 – 7 ]. Multiple wave systems, such as water wave [ 8 ], phononic [ 9 ], acoustic [ 10 ], and photonic [ 3 – 4 ] systems, can support BICs, which play a critical role in sensors [ 11 – 13 ], filters [ 14 ], lasers [ 15 – 17 ], nonlinear optics [ 18 – 24 ], and quantum devices [ 25 – 26 ]. An ideal BIC could be viewed as a cavity that suppresses radiation in all directions.…”

Section: Introductionmentioning

confidence: 99%

Observation of multiple bulk bound states in the continuum modes in a photonic crystal cavity

Chen¹,

Zheng²,

Huang³

et al. 2023

Beilstein J. Nanotechnol.

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Obtaining bound states in the continuum (BICs) in photonic crystals gives rise to the realization of resonances with high quality factors for lasing and nonlinear applications. For BIC cavities in finite-size photonic crystals, the bulk resonance band turns into discrete modes with different mode profiles and radiation patterns. Here, photonic-crystal BIC cavities encircled by the photonic bandgap of lateral heterostructures are designed. The mirror-like photonic bandgap exhibits strong side leakage suppression to confine the mode profile in the designed cavity. Multiple bulk quantized modes are observed both in simulation and experiment. After exciting the BIC cavity at different positions, different resonance peaks are observed. The physical origin of the dependence between the resonance peak and the illuminating position is explained by analyzing the mode profile distribution and further verified by numerical simulations. Our findings have potential applications regarding the mode selectivity in BIC devices to manipulate the lasing mode in photonic-crystal surface-emitting lasers or the radiation pattern in nonlinear optics.

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“…She is now with the School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, P. R. China (e-mail: xsx@usst.edu.cn). associated high-Q resonances around a BIC point have earned considerable attention to construct ultra-sharp transmission/reflection spectra, leading to a giant near-field enhancement and various promising applications, such as BICbased chirality [8][9][10][11], lasing [12][13][14] beam shifting [15,16], decreasing radiative losses [17], nonlinearity [18][19][20][21][22], modulation [23,24] and sensing [25]. In photonic systems, one case is symmetry-protected BICs located at the center of Brillouin zone (Γ point), which is relevant to the complete incompatibility between resonant mode and radiative channels due to symmetry mismatch [5,26].…”

Section: Introductionmentioning

confidence: 99%

Multiple Photonic Bound States in the Continuum in an Electromagnetically Induced Transparency Metasurface

Xie

Bai

et al. 2022

IEEE Photonics J.

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Bound state in the continuum (BIC), as a novel eigenmode with infinitely high-quality factor, has received great attention in modern optical science. Mode coupling in dielectric metasurfaces opens possibilities in searching for robust BICs. Here, we discover multiple BICs in periodic dielectric resonators composed of a silicon rectangular bar and a silicon ring in one lattice. For the symmetry-protected BIC at-Γ point, a sharp electromagnetically induced transparency window can be formed by either tilting incident angle to induce the 'bright-bright' mode coupling, or by displacing the ring to generate the 'bright-dark' mode coupling. Besides, the coupling between two resonators leads to a new energy band in the dielectric metasurface. As a result, two off-Γ BICs are formed owing to avoided crossings with two energy bands, and another one belongs to the single-resonance parametric BIC. Thus, our coupled resonators possess superior abilities to judiciously engineer BICs via versatile physical mechanisms. Taking advantage exclusively of coupled resonators in dielectric metasurfaces provides fresh insights into the creation of both symmetry-protected and accidental BICs, which enables profound advancements in designing novel photonic devices.

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Efficient Second‐Harmonic Generation from Silicon Slotted Nanocubes with Bound States in the Continuum

Cited by 45 publications

References 65 publications

Second‐Harmonic Generation in Strained Silicon Metasurfaces

Second‐Harmonic Generation in Strained Silicon Metasurfaces

Observation of multiple bulk bound states in the continuum modes in a photonic crystal cavity

Multiple Photonic Bound States in the Continuum in an Electromagnetically Induced Transparency Metasurface

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