Polarization-controlled dynamically switchable high-harmonic generation from all-dielectric metasurfaces governed by dual bound states in the continuum

Xiao, Shuyuan; Qin, Meibao; Duan, Junyi; Wu, Feng; Liu, Tingting

doi:10.1103/physrevb.105.195440

Cited by 100 publications

(19 citation statements)

References 70 publications

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“…This trend of the Q factor is consistent with the distinct physical mechanism of the symmetry-protected BIC. [37,38] The introduction of the asymmetry leads to the transformation of the BIC mode into a quasi-BIC mode, which may be excited and then observed in the transmission spectrum. It also can be seen from the distribution of magnetic field Hx that maintains the same symmetry as the grating structure without dislocation, and this symmetry of the magnetic field Hx is destroyed when the upper layer grating and the lower layer grating in the structure are slightly misaligned (S = 5 nm).…”

Section: Resultsmentioning

confidence: 99%

Perfect Narrow‐Band Absorber of Monolayer Borophene in All‐Dielectric Grating Based on Quasi‐Bound State in the Continuum

Liu

2023

Annalen der Physik

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Borophene has the unique optical properties of two-dimensional materials and its own anisotropic characteristics. This work proposes a perfect narrow-band absorption structure to enhance the interaction of light with the monolayer borophene inserted into two different dielectric gratings. The structure efficiently improves absorption efficiency based on the quasi-bound states in the continuum (Q-BIC). The absorption characteristics are numerically simulated and theoretically analyzed by using the rigorous coupled-wave analysis (RCWA) method and the finite element method (FEM). The absorption efficiency of the monolayer borophene is high, up to 99.18% with a full-width at half maximum (FWHW) of 0.62 nm, achieving nearly perfect narrow-band absorption. Moreover, the mechanism of enhanced absorption of monolayer borophene is verified by the coupled mode theory (CMT), which indicates that the nearly perfect absorption is also derived from the critical coupling. At the same time, the influence of the thickness and width of the two layer dielectric structure on the absorption efficiency is theoretically analyzed. Furthermore, due to the anisotropic optical properties of the structure for TE and TM polarized light, a narrow-band polarization plate or sensor can be realized. The structure designed provides a new possibility to enhance the interaction between monolayer borophene and light.

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Section: Resultsmentioning

confidence: 99%

Perfect Narrow‐Band Absorber of Monolayer Borophene in All‐Dielectric Grating Based on Quasi‐Bound State in the Continuum

Liu

2023

Annalen der Physik

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“…Plasmonic refractive index (RI) sensors have been extensively employed in food safety, disease diagnosis, and biochemical analysis as they enable high sensitivity and label-free detection. [1][2][3][4][5][6][7][8] Localized surface plasmon resonance (LSPR) and propagating surface plasmon resonance (PSPR) are two kinds of classical plasmonic RI sensors. Surface plasmons are confined on the metal-medium interface and inherently sensitive to the changes in the surrounding RI within the penetration depth of the evanescent field.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity investigation of a biosensor with resonant coupling of propagating surface plasmons to localized surface plasmons in the near infrared region

Wang

Zhong

et al. 2023

Nanoscale

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“…In order to minimize the radiative leakage, the interplay between resonant modes has been explored to sustain high Q-factor resonances with narrower linewidths through different coupling mechanisms such as Fano resonances [6,12,13] and quasi-bound states in the continuum (quasi-BICs). [14][15][16][17][18][19] In addition, the interference of dipolar resonances can be utilized to control the far-field scattering directly based on Kerker effects. [20] As the scattered fields of the electric dipole (ED) and magnetic dipole (MD) modes exhibit an opposite parity, the constructive or destructive interference of these dipolar resonances results in either the suppression of backward scattering or near-zero forward scattering, known as the first and second Kerker conditions, respectively.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Hsieh

Lin

et al. 2023

Advanced Optical Materials

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The abundant multipolar resonances in all‐dielectric metasurfaces provide a new paradigm to simultaneously induce strong near‐field confinement in the interior of a nanocavity as well as to manipulate the far‐field scattering property, which is beneficial for the enhancement of nonlinear effects. Here, third‐harmonic generation (THG) of all‐dielectric silicon metasurfaces that sustain dominant electric dipole (ED), toroidal dipole (TD), and magnetic dipole (MD) moments in near‐infrared is numerically and experimentally studied. The effect of the interplay of these resonant modes on THG is investigated, and a pronounced THG enhancement is observed when these modes become spectrally overlapped, corresponding to the generalized Kerker condition. The constructive interference of the total electric dipole (refers to the summation of the ED and TD scattered fields) and MD modes results in the suppression of the backward scattering along with a strong local‐field enhancement inside the dielectric resonators. The simulation (experimental) results show a 214‐fold (17‐fold) THG enhancement in the vicinity of the generalized Kerker condition compared with the signals of the spectrally separated TD and MD resonances. The silicon‐based metasurfaces with their simple geometry are facile for large‐area fabrication and open new possibilities for the optimization of upconversion processes to achieve efficient nonlinear devices.

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Polarization-controlled dynamically switchable high-harmonic generation from all-dielectric metasurfaces governed by dual bound states in the continuum

Cited by 100 publications

References 70 publications

Perfect Narrow‐Band Absorber of Monolayer Borophene in All‐Dielectric Grating Based on Quasi‐Bound State in the Continuum

Perfect Narrow‐Band Absorber of Monolayer Borophene in All‐Dielectric Grating Based on Quasi‐Bound State in the Continuum

Sensitivity investigation of a biosensor with resonant coupling of propagating surface plasmons to localized surface plasmons in the near infrared region

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

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