Third Harmonic Generation Enhanced by Generalized Kerker Condition in All‐Dielectric Metasurfaces

Liu, Ai‐Yin; Hsieh, Jou‐Chun; Lin, Kwang‐Lung; Tseng, Snow H.; Hsiao, Hui Hsin

doi:10.1002/adom.202300526

Cited by 3 publications

(1 citation statement)

References 45 publications

(60 reference statements)

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“…This nanostructured planar optics is expected to play a role in the problem of enhancing the light absorption coefficient of DUV photodiodes. Research has proven that there are many effective ways to realize Kerker's original idea of matching electric dipole (ED) and magnetic dipole (MD) moments in nanoparticles, as well as the general generalization of Kerker's conditions [23][24][25]. Nevertheless, the challenges encountered in the design of this directional scattering scheme are rooted in the fact that both ED and MD resonances are contingent upon geometric parameters.…”

Section: Introductionmentioning

confidence: 99%

Enhancing light absorption of deep ultraviolet photodiodes through intelligent algorithm-guided design of resonant nano-optical structures

Zhu,

Lu,

Wang

et al. 2024

Semicond. Sci. Technol.

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The surface of the deep ultraviolet (DUV) photodiodes requires an enhanced light absorption to improve wall-plug efficiency. The resonant Mie scatterer has a high optical mode density with a high refractive index all-dielectric resonant structure, which causes strong light coupling and improves forward scattering, providing a new perspective for efficient light absorption on the surface of the DUV photodiodes. In this work, a method is proposed for the design of nano-optical structures that is capable of supporting forward light scattering across the resonant bandwidth. This is achieved by utilizing intelligent algorithms in conjunction with Maxwell’s equations. The results show that the average light absorption coefficient of the optimized optical structure is improved to more than 96% with angle-independent and polarization-independent characteristics. Based on intelligent algorithms, a reverse design approach can be employed to maximize this effect, thereby offering novel avenues for enhancing the wall-plug efficiency of the DUV photodiodes.

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Section: Introductionmentioning

confidence: 99%

Enhancing light absorption of deep ultraviolet photodiodes through intelligent algorithm-guided design of resonant nano-optical structures

Zhu,

Lu,

Wang

et al. 2024

Semicond. Sci. Technol.

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Polarization-insensitive and polarization-controlled dual-band third-harmonic generation in silicon metasurfaces driven by quasi-bound states in the continuum

Qin,

Wei,

et al. 2024

Applied Physics Letters

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High-refractive-index nanostructures offer versatile opportunities for nonlinear optical effects, due to their ability to strongly confine field into a subwavelength scale. Herein, we propose a rhomboidal amorphous silicon metasurface to realize high-efficiency dual-band third-harmonic generation (THG), based on the supported dual quasi-bound states in the continuum (Q-BICs). Owing to the very large field confinement inside the metasurface empowered by Q-BICs, the THG efficiency up to 3.74 × 10−3 with the peak pump intensity of 30 MW/cm2 is observed. Meanwhile, thanks to the very high quality factor of Q-BICs, the ultra-narrow nonlinear process with the full width at half maximum less than 1 nm is also witnessed, suggesting the good monochromaticity. Interestingly, the dual-band THG is verified to be polarization-dependent and polarization-insensitive, respectively. The finite element method simulations exhibit that the polarization-dependent THG is attributed to the Q-BIC driven by the electric quadrupole characterized by a pair of anti-parallel electric dipoles along the x axis, which are only excited by the x-linearly polarized light. On the contrary, the polarization-insensitive THG is enabled by another Q-BIC governed by the magnetic dipole resonance with circular electric field vectors, which can be excited by any linearly polarized light. The polarization-controlled and polarization-independent dual-band THG enabled by the physics of Q-BICs would open possibilities for designing switchable nonlinear light sources. The proposed dual Q-BICs scheme undoubtedly can serve as a universal recipe for other nonlinear effects, including sum-frequency generation, difference-frequency generation, and high-order harmonics.

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Realizing high-efficiency third harmonic generation via accidental bound states in the continuum

Tang,

Zhao,

Wang

et al. 2024

Opt. Lett.

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The bound states in the continuum (BICs) have attracted much attention in designing metasurface due to their high Q-factor and effectiveness in suppressing radiational loss. Here we report on the realization of the third harmonic generation (THG) at a near-ultraviolet wavelength (343 nm) via accidental BICs in a metasurface. The absolute conversion efficiency of the THG reaches 1.13 × 10−5 at a lower peak pump intensity of 0.7 GW/cm2. This approach allows the generation of an unprecedentedly high nonlinear conversion efficiency with simple structures.

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Third Harmonic Generation Enhanced by Generalized Kerker Condition in All‐Dielectric Metasurfaces

Cited by 3 publications

References 45 publications

Enhancing light absorption of deep ultraviolet photodiodes through intelligent algorithm-guided design of resonant nano-optical structures

Enhancing light absorption of deep ultraviolet photodiodes through intelligent algorithm-guided design of resonant nano-optical structures

Polarization-insensitive and polarization-controlled dual-band third-harmonic generation in silicon metasurfaces driven by quasi-bound states in the continuum

Realizing high-efficiency third harmonic generation via accidental bound states in the continuum

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