Experimental observation of a polarization vortex at an optical bound state in the continuum

Doeleman, Hugo M.; Monticone, Francesco; Hollander, Wouter den; Alù, Andrea; Koenderink, A. Femius

doi:10.1038/s41566-018-0177-5

Cited by 420 publications

(284 citation statements)

References 20 publications

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“…In the last years, the BICs as acoustic trapped modes have been observed in water wave channels and as Fano resonances in coupled plasmonic systems . Very recently, they are also found in two‐dimensional parity‐time symmetric waveguides and in photonic structures with BICs topologically protected by polarization vortices …”

Section: Introductionmentioning

confidence: 99%

“…[6] Very recently, they are also found in two-dimensional parity-time symmetric waveguides [7] and in photonic structures with BICs topologically protected by polarization vortices. [8] In this article, we report a detailed study of BICs in a finite thin metallic nanobelt with impurities of transition metal atoms placed at its central sites. This study was carried out by means of the tight-binding Hamiltonian and the Kubo-Greenwood formalism.…”

Section: Introductionmentioning

confidence: 99%

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Defect‐Induced Bound States in the Continuum Band of Metallic Nanobelts

Sánchez

Wang

2018

Physica Status Solidi (b)

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Bound states in the continuum (BICs) can be induced by structural defects or impurities and they have important applications in electronic and photonic devices, such as sensors with extremely high quality factor. A simple structure for the analysis of the electronic BICs could be two‐channel nanobelts with two central impurities. The nearest‐neighbor tight‐binding Hamiltonian of this structure is separable and one of the localized impurity states constitutes a BIC with null mobility. In this article, we study the localization and electrical conductivity of such BIC of a metallic belt with transition metal impurities. Significant changes in these two quantities are observed, when a small second‐neighbor hopping integral between the impurities and neighboring atoms is considered. The results of this study reveal the sensibility of such BICs to the short‐range hopping integrals in nanostructures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Defect‐Induced Bound States in the Continuum Band of Metallic Nanobelts

Sánchez

Wang

2018

Physica Status Solidi (b)

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“…b 0 die and dy are assumed to be b 1 YIG and (π/2 − θ)/ky such that Im(r f ) = Im(t b ) = 0 according to Eq. (8,9). Two nodal lines Re(r f ) = 0 and Re(t b ) = 0 are shown as a dashed red line and as a solid blue line, respectively.…”

mentioning

confidence: 99%

“…The two conditions in Eq. (8)(9) are assumed such that the nonzero components of F are Re(r f ), Re(t b ) only and are shown in the 2D vector field. In both figures, all the vectors are normalized individually.…”

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confidence: 99%

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Topological theory for perfect metasurface isolators

et al. 2020

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We introduce topological theory of perfect isolation: perfect transmission from one side and total reflection from another side simultaneously. The theory provides an efficient approach for determining whether such a perfect isolation point exists within a finite parameter space. Herein, we demonstrate the theory using an example of a Lorentz non-reciprocal metasurface composed of dimer unit cells. Our theory also suggests that perfect isolation points can annihilate each other through the coalescence of opposite topological charges. Our findings could lead to novel designs for high-performance optical isolators.

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Spatiotemporal Lineshape Tailoring in BIC‐Mediated Reconfigurable Metamaterials

Tong

et al. 2022

Adv Funct Materials

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The bound state in the continuum (BIC) is a unique nonradiating eigenstate that possesses rich physics and has attracted intensive attention in the field of optics and photonics. Actively tailoring BICs in a designable fashion is highly desired for diversified photonic devices. However, to date, most BIC‐assisted works have been limited to showing passive control in a fixed structure configuration without tuning the spectral responses. Here, a new scheme to construct a coupled photon cavity for spatiotemporal lineshape tailoring, in which a nonradiating BIC is embedded in the electromagnetic induced transparency (EIT) window, is proposed. This approach uses the phase transition of VO2 inclusions to induce spatial symmetry breaking, leading to the formation of a quasi‐BIC coupled EIT state. As an extra dimension for dynamic tuning, a layer with a transient photoconductivity much shorter than the photon lifetime is introduced to ultrafast switch the leaky modes for both EIT‐ and quasi‐BIC‐coupled EIT cavities. As the symmetry‐protected BIC and coupling effect are quite common in optical metasurfaces, this proposal provides a general paradigm to active steer spatiotemporal spectrum across multiple dimensions, which is thus believed to promote active metadevices for potential applications in modulators, sensors, filters, and dynamic imaging.

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Experimental observation of a polarization vortex at an optical bound state in the continuum

Cited by 420 publications

References 20 publications

Defect‐Induced Bound States in the Continuum Band of Metallic Nanobelts

Defect‐Induced Bound States in the Continuum Band of Metallic Nanobelts

Topological theory for perfect metasurface isolators

Spatiotemporal Lineshape Tailoring in BIC‐Mediated Reconfigurable Metamaterials

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