Angular Transmission Response of In-Plane Symmetry-Breaking Quasi-BIC All-Dielectric Metasurfaces

Levanon, Nir; Indukuri, S. R. K. Chaitanya; Frydendahl, Christian; Bar-David, Jonathan; Han, Zhonghua; Mazurski, Noa; Levy, Uriel

doi:10.1021/acsphotonics.2c01069

Cited by 21 publications

(12 citation statements)

References 45 publications

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“…In contrast to the previous in-plane metasurface designs that relied on modifying the in-plane geometry of the meta-atoms to control the asymmetry, [34][35][36] the proposed architecture comprises pairs of metagratings with two different depths to induce outof-plane symmetry broken. [37,38] To examine the relationship between the depth and the electron dose, we expose a series of test rectangular bar patterns in polymethyl methacrylate (PMMA) resist.…”

Section: Resultsmentioning

confidence: 99%

Immersion‐Triggered Switchable Quasi‐BIC with Optical Encryption from 1.5D Metagratings

Tang

Dai

Shi

et al. 2023

Adv Funct Materials

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Actively tuning quasi‐bound states in the continuum (q‐BIC) has emerged as a prominent theme in nanophotonics due to its tailored light–matter interaction. However, the practical controllable q‐BIC metadevices still exhibit critical challenges for achieving convenient tuning in the visible regime with strong reversibility and large‐area implementation. Herein, an immersion‐triggered tuning approach is demonstrated for switchable q‐BIC in the visible regime using 1.5D metagratings. Moreover, by employing the water as the trigger, active q‐BIC‐based optical information encryption is demonstrated due to the spectra alternation. In addition, the proposed q‐BIC is insensitive to incident angles regarding quality factor, resonant wavelength, and modulation depth (MD). This immersion‐triggered strategy for q‐BIC offers a practical tuning approach for achieving dynamic switchable optical functionalities, with potential applications in metasurface‐empowered active q‐BIC optical devices.

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Section: Resultsmentioning

confidence: 99%

Immersion‐Triggered Switchable Quasi‐BIC with Optical Encryption from 1.5D Metagratings

Tang

Dai

Shi

et al. 2023

Adv Funct Materials

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“…34 In addition, asymmetry perturbations can also be achieved by oblique incidence. 35,36 Symmetry-protected BICs can be described as the mode which is at the center of the Brillouin zone, with high symmetry (Γ point), and not coupled with the waves in free space. 37,38 The eigenmode frequencies are purely real, which indicates no radiative loss.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The perturbations are introduced into the resonant system due to the existence of asymmetry, causing the deviation of ideal BIC states from the nonradiative mode to the leaky mode . In addition, asymmetry perturbations can also be achieved by oblique incidence. , Symmetry-protected BICs can be described as the mode which is at the center of the Brillouin zone, with high symmetry (Γ point), and not coupled with the waves in free space. , The eigenmode frequencies are purely real, which indicates no radiative loss. However, some isolated modes appear elsewhere in the momentum space, called accidental BICs.…”

Section: Introductionmentioning

confidence: 99%

Coupling-Based Multiple Bound States in the Continuum and Grating-Assisted Permittivity Retrieval in the Terahertz Metasurface

Cui,

Wang,

Sun

et al. 2024

ACS Appl. Mater. Interfaces

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The terahertz (THz) metasurfaces that support bound states in the continuum (BICs) provide a promising platform for various applications due to their high Q-factor resonance. In this study, we experimentally demonstrate multiple BICs with different resonance symmetries in the THz metasurface based on mode coupling. The proposed metasurface is composed of 2 × 2 split ring resonators (SRRs) metamolecules. The SRRs of two different gap angles in the metamolecule lattice provide intrinsic resonance with different frequencies, and the coupling between them exhibits high transmission quasi-BIC resonance, which can be tuned by varying the gap angle. The arrangement of SRRs in the 2 × 2 metamolecule lattice determines the types of coupling that govern the resonance symmetry of quasi-BIC. More interestingly, the multiple quasi-BICs enabled by different couplings can be simultaneously achieved in a metasurface. Apart from tuning the gap angles, the permittivity in the vicinity of SRRs also changes the resonance frequency. Consequently, quasi-BIC can be artificially formed by deliberately constructing the permittivity difference of the dielectric environment on the SRRs. In view of this, we introduce the scheme of permittivity retrieval for the dispersive analyte, assisted by the fixed-permittivity gratings. In addition, we experimentally demonstrate the metasurface in combination with the microfluidic chip for the sensing of the glucose solution concentration. Our findings offer a possible strategy for the existing manufactured metasurface to achieve quasi-BIC resonance and provide a promising candidate for approaching the spectral analysis of the biochemical.

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“…Each multipole is a resonance of the structure and is often referred to as a Mie-type resonance. [20] As mentioned, a high refractive index is crucial for these type of resonances to appear, and therefore there is a growing interest in using high index materials for implementing complex structures that can manipulate phase, [21][22][23][24][25][26][27][28] induce transparency, [29][30][31] create structural colors, [32][33][34][35] support bound state in the continuum (BIC) like states [36,37] and anapole states [38] with a high quality factor and even enhancing nonlinearities. [39,40] We summarize in Table 1 the optical constants (evaluated at a wavelength of 532 nm) of several high-index dielectric materials currently used for metasurface construction.…”

Section: Introductionmentioning

confidence: 99%

Silicon Rich Nitride Huygens Metasurfaces in the Visible Regime

Goldberg,

Gherabli,

Engelberg

et al. 2023

Advanced Optical Materials

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In recent years there has been a shift of interest in the Nanophotonics community moving from using metallic/plasmonic materials to using high‐index dielectric materials for the construction of metasurfaces. Although high‐index dielectrics hold many advantages over their plasmonic counterparts, the selection of materials that exhibit high‐index properties, have low loss, and are complemetary metal‐oxide‐semiconductor (CMOS) compatible that also operate in the visible regime is extremely challenging. In this work, a high‐index dielectric material using silicon rich nitride (SRN) is proposed and experimentally demonstrated as a platform for solving this problem. While SRN has been used before for diffractive lenses and structural colors, here its applicability for Huygens‐type metasurfaces is focused upon. Specifically, a Huygens metasurface that operates in the visible range around a wavelength of 575 nm is theoretically and experimentally demonstrated, and the capabilities of spatially controlling the phase of this metasurface are further demonstrated by designing and fabricating a Huygens meta hologram. The study also shows that the refractive index can be controlled by the interplay between SiH4 and NH3 during the plasma‐enhanced chemical vapor deposition (PECVD) process.

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Angular Transmission Response of In-Plane Symmetry-Breaking Quasi-BIC All-Dielectric Metasurfaces

Cited by 21 publications

References 45 publications

Immersion‐Triggered Switchable Quasi‐BIC with Optical Encryption from 1.5D Metagratings

Immersion‐Triggered Switchable Quasi‐BIC with Optical Encryption from 1.5D Metagratings

Coupling-Based Multiple Bound States in the Continuum and Grating-Assisted Permittivity Retrieval in the Terahertz Metasurface

Silicon Rich Nitride Huygens Metasurfaces in the Visible Regime

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