Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing

Saadatmand, Seyedeh Bita; Ahmadi, Vahid; Hamidi, Seyedeh Mehri

doi:10.1038/s41598-023-48051-2

Cited by 29 publications

(3 citation statements)

References 64 publications

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“…For example, BZA 2 PbI 4 with the higher dielectric coefficient has a larger redshift than the others. The redshift can be explained by perturbation theory as (δω/ω 0 ) = −(∭Δε| E | 2 d V /2 ∭ε 0 | E | 2 d V ), where δω, ω 0 , and Δε represent the resonance shift, resonance frequency, and change in the dielectric coefficient, respectively . Increasing the dielectric coefficient of the materials results in a larger redshift of the resonances.…”

Section: Resultsmentioning

confidence: 99%

“…The redshift can be explained by perturbation theory as (δω/ω 0 ) = −(∭Δε| E | 2 d V /2 ∭ε 0 | E | 2 d V ), where δω, ω 0 , and Δε represent the resonance shift, resonance frequency, and change in the dielectric coefficient, respectively. 30 Increasing the dielectric coefficient of the materials results in a larger redshift of the resonances. To fit the Fano resonance curves of q-BICs, the Fano formula, , is used.…”

Section: Resultsmentioning

confidence: 99%

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Metastructure Engineering with Ruddlesden–Popper 2D Perovskites: Stability, Flexibility, and Quality Factor Trade-Offs

Saadatmand,

Shokouhi,

Ahmadi

et al. 2024

ACS Omega

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In this study, we investigate the opto-electromechanical properties, thermodynamic stability, and moisture stability of the Ruddlesden−Popper (RP) two-dimensional perovskites of L 2 PbI 4 (L = PEA, FPEA, BA, and BZA) using density functional theory. The goal is to explore their potential application in metastructures. The results show that the stability of FPEA 2 PbI 4 is better than that of PEA 2 PbI 4 , BA 2 PbI 4 , and BZA 2 PbI 4 due to the replacement of a hydrogen atom with a fluorine atom. On the other hand, BA 2 PbI 4 is more flexible than other materials because it lacks an aromatic ring in its spacer cation, but it is less stable. We introduce a new kind of metastructure composed of an RP perovskite film and conduct an extensive investigation of the quasi-bound states in the continuum (q-BIC) characteristics by near-field analysis and multipole decomposition calculations. The q-BIC resonances in BZA 2 PBI 4 have a greater quality factor due to its larger refractive index in comparison to other materials. Therefore, based on these results, the perovskite materials can be selected for the metastructures from different aspects of stability, flexibility, and refractive index.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Metastructure Engineering with Ruddlesden–Popper 2D Perovskites: Stability, Flexibility, and Quality Factor Trade-Offs

Saadatmand,

Shokouhi,

Ahmadi

et al. 2024

ACS Omega

Self Cite

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“…ultrasensitive sensing [17], and highly e cient optoelectronics [18][19][20][21][22]. An effective way to elevate photoelectric detection is to improve photon absorption.…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet perfect absorption leveraging BICs in Al/SiO2 hybrid system

Wu,

Liu,

Zhu

et al. 2024

Preprint

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The bound states in the continuum (BICs), coupled resonance in non-Hermitian system, is typically manifested by a zero linewidth and an infinite resonance quality factor. These unique features facilitate various developments and applications in low-threshold lasers, ultrasensitive sensing, and highly efficient optoelectronics. Numerous research has been devoted to achieving perfect absorption leveraging BICs in the visible regime. For hybrid systems, it is a major issue to manipulate BICs in the ultraviolet regime. Moreover, there is currently a lack of achieving perfect absorption leveraging BICs in the ultraviolet regime. Here, a kind of Al/SiO2 hybrid system is theoretically proposed to realize perfect absorption by motivating various types of BICs in the ultraviolet regime. In this work, the perfect absorption of 99.97% can be achieved in the Al/SiO2 hybrid system at the wavelength of 304.4 nm. Importantly, the BICs can be modulated into the ultraviolet regime by adjusting the geometric parameters and the incident light angles, and the Q factor of 1099.4 can be successfully obtained. This work builds a theoretical foundation to realize the perfect absorption leveraging BICs for UV light detection.

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Multifunctional Metasurface: Holography and Spot Cloud Projection

Guo,

Shao,

Zhan

et al. 2024

Advanced Optical Materials

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Multifunctionality, integration, and miniaturization are the mainstream trends in modern device development. However, optical display and depth perception, essential for innovative applications like intelligent driving and mixed reality, are typically achieved separately in complex and bulky optical systems. Metasurfaces, ultrathin artificial optical surfaces with strong light–matter interaction capabilities at the nanoscale, offer a versatile platform for creating multifunctional, highly integrated, and miniaturized devices by fully exploring spatial multiplexing and utilizing variables like location, polarization, and frequency. In this study, a multifunctional metasurface that integrates meta‐holography with Dammann gratings is presented. By engineering the phase profile, the device can display specific holographic images in the Fresnel region while simultaneously producing a high‐density spot cloud with over 37 000 spots covering the entire half space. As a proof‐of‐concept, a projection and reconstruction experiment is performed to elaborate its potential for retrieving three‐dimensional (3D) spatial information of real scenarios. The simultaneous generation of display and point cloud holds significant promise for applications in cutting‐edge imaging technologies such as intelligent driving and robot vision.

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Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing

Cited by 29 publications

References 64 publications

Metastructure Engineering with Ruddlesden–Popper 2D Perovskites: Stability, Flexibility, and Quality Factor Trade-Offs

Metastructure Engineering with Ruddlesden–Popper 2D Perovskites: Stability, Flexibility, and Quality Factor Trade-Offs

Ultraviolet perfect absorption leveraging BICs in Al/SiO2 hybrid system

Multifunctional Metasurface: Holography and Spot Cloud Projection

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