Giant enhancement of harmonic generation in all-dielectric resonant waveguide gratings of quasi-bound states in the continuum

Ning, Tingyin; Li, Xin; Zhao, Yan; Yin, Luying; Huo, Yanyan; Zhao, Lina; Yue, Qing-Yang

doi:10.1364/oe.409276

Cited by 55 publications

(19 citation statements)

References 34 publications

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“…The development of biosensors with fast response, high accuracy, and capability for real-time and on-site detection has become increasingly significant for human well-being, especially for the diagnosis and treatment monitoring of infectious disease threats. Biosensors require high sensitivity, high localized electromagnetic field can be tailored by tuning shape, size, periodicity, and composition of all-dielectric structures for broad applications such as sensing, [8] optical switching, [9] higher harmonic generation, [10,11] and color nanoprinting. [12] The advantages of all-dielectric structures over their plasmonic counterparts are attributed to their generally low intrinsic material damping and their compatibility with well-developed industrial semiconductor fabrication technologies such as complementary metal-oxide-semiconductor (CMOS).…”

Section: Introductionmentioning

confidence: 99%

All‐Dielectric Crescent Metasurface Sensor Driven by Bound States in the Continuum

Wang

Kühne

Karamanos

et al. 2021

Adv Funct Materials

183

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Metasurfaces based on quasi-bound states in the continuum (quasi-BICs) constitute an emerging toolkit in nanophotonic sensing as they sustain high quality factor resonances and substantial near-field enhancements. It is demonstrated that silicon metasurfaces composed of crescent shaped meta-atoms provide tailored light-matter interaction controlled by the crescent geometry. Significantly, this metasurface not only exhibits a fundamental quasi-BIC resonance, but also supports a higher-order resonance with tunable electromagnetic field enhancement and advantageous properties for sensing. The higher-order resonance shows twice the sensitivity of the fundamental one for bulk refractive index sensing. It is further demonstrated that both the fundamental and higher-order resonances can be exploited for sensing ultrathin layers of biomolecules in air and buffer solutions. Specifically, when measuring in buffer solution, the figure of merit of the sensor, defined as the change in the spectral position of the resonance normalized to its full width at half maximum, is a factor of 2.5 larger for the higher-order resonance when compared to the fundamental one. Due to its high sensitivity and potential for straightforward microfluidic integration, the silicon crescent metasurface is ideally suited for real-time and in situ biosensing, enabling compact sensing devices for a wide range of diagnostic applications.

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Section: Introductionmentioning

confidence: 99%

All‐Dielectric Crescent Metasurface Sensor Driven by Bound States in the Continuum

Wang

Kühne

Karamanos

et al. 2021

Adv Funct Materials

183

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“…The schematic unit cell of the SiN-GMR structure on a fused silicon substrate is shown in Figure 1a, similar to the structure reported in [26,27]. d a , d b and d c denote the width of filled and unfilled parts of grating layer, respectively.…”

Section: Numerical Model and Materials Parametersmentioning

confidence: 80%

“…The settings are similar to those we used in Refs. [9,27]. kx,i with different i under different angles of incidence is shown in Figure 1b.…”

Section: Numerical Model and Materials Parametersmentioning

confidence: 99%

“…The quasi-BICs of high Q factors can be realized when δ changes from zero to nonzero as discussed in Refs. [26,27]. Nonlinear TCMT is employed to analysis the reflectance spectrum of GMR consisting of Kerr media under different input intensity.…”

Section: Numerical Model and Materials Parametersmentioning

confidence: 99%

“…Recently, the GMR nanostructures consisting of a four-part grating layer of quasi-BICs with ultra-high Q factors were investigated for Goos-Hänchen shift and harmonic generation [26,27]. In this paper, we further investigate the optical bistability in GMR nanostructures of quasi-BICs.…”

Section: Introductionmentioning

confidence: 99%

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Broadband and Ultra-Low Threshold Optical Bistability in Guided-Mode Resonance Grating Nanostructures of Quasi-Bound States in the Continuum

Zhang

Huo

et al. 2021

Nanomaterials

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We model optical bistability in all-dielectric guide-mode resonance grating (GMR) nanostructures working at quasi-bound states in the continuum (BICs). The complementary metal-oxide-semiconductor (CMOS) compatible material silicon nitride (SiN) is used for the design of nanostructures and simulations. The ultra-low threshold of input intensity in the feasible nanostructure for nanofabrication is obtained at the level of ~100 W/cm2 driven by quasi-BICs. Additionally, the resonance wavelength in the GMR nanostructure can be widely tuned by incident angles with the slightly changed Q-factor that enables the optical bistable devices to work efficiently over a wide spectrum. The impact of the defects of grating that may be introduced in the fabrication process on the optical properties is discussed, and the tolerance of the defects to the optical performance of the device is confirmed. The results indicate that the GMR nanostructures of broadband and ultra-low threshold optical bistability driven by quasi-BICs are promising in the application of all-optical devices.

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High‐Contrast Switching of Light Enabled by Zero Diffraction

Henkel,

Schumacher,

Meudt

et al. 2023

Advanced Photonics Research

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Diffraction allows to change the direction of light. Therefore, controlling the diffraction efficiency with high contrast enables controlling the pathway of light within optical systems. However, a high contrast requires that the diffraction efficiency is tunable close to zero. Probably the most prominent example for zero diffraction in a waveguide grating is a bound state in the continuum (BIC). Herein, zero diffraction of two plane waves under symmetric incidence to a leaky symmetric waveguide grating is found. The phenomenon not only occurs at singular spectral positions but on continuous curves in the energy–momentum space. The relative phase of the two waves enables large contrast control over diffraction in a wide spectral range. The practical meaning of this finding for local switching is demonstrated. Light is trapped into a nonlinear optical waveguide and detrapped at a desired position with electric control. A switching contrast exceeding 1000 is experimentally shown.

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Giant enhancement of harmonic generation in all-dielectric resonant waveguide gratings of quasi-bound states in the continuum

Cited by 55 publications

References 34 publications

All‐Dielectric Crescent Metasurface Sensor Driven by Bound States in the Continuum

All‐Dielectric Crescent Metasurface Sensor Driven by Bound States in the Continuum

Broadband and Ultra-Low Threshold Optical Bistability in Guided-Mode Resonance Grating Nanostructures of Quasi-Bound States in the Continuum

High‐Contrast Switching of Light Enabled by Zero Diffraction

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