scholarly journals Asymmetric excitations of toroidal dipole resonance and magnetic dipole quasi-bound state in the continuum in an all-dielectric metasurface

2021 ◽  
Author(s):  
Bin Li ◽  
Jin Yao ◽  
Han Zhu ◽  
Guoxiong Cai ◽  
Qing Huo Liu
Keyword(s):  
Magnetic Dipole ◽  
Bound State ◽  
Dipole Resonance ◽  
Dielectric Metasurface ◽  
The Continuum ◽  
Quasi Bound State

scholarly journals High‐Q Transparency Band in All‐Dielectric Metasurfaces Induced by a Quasi Bound State in the Continuum

2020 ◽  
pp. 2000263
Author(s):  
Diego R. Abujetas ◽  
Ángela Barreda ◽  
Fernando Moreno ◽  
Amelie Litman ◽  
Jean‐Michel Geffrin ◽  
...  
Keyword(s):  
Bound State ◽  
High Q ◽  
The Continuum ◽  
Quasi Bound State

scholarly journals Ultrasensitive terahertz sensing with high-Q toroidal dipole resonance governed by bound states in the continuum in all-dielectric metasurface

Nanophotonics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 1295-1307
Author(s):  
Yulin Wang ◽  
Zhanghua Han ◽  
Yong Du ◽  
Jianyuan Qin
Keyword(s):  
Bound States ◽  
Photonic Devices ◽  
Low Loss ◽  
Photonic Sensor ◽  
Dipole Resonance ◽  
Ultrahigh Sensitivity ◽  
Terahertz Frequencies ◽  
Symmetry Protected ◽  
Dielectric Metasurface ◽  
The Continuum

Abstract Toroidal dipole (TD) with weak coupling to the electromagnetic fields offers tremendous potential for advanced design of photonic devices. However, the excitation of high quality (Q) factor TD resonances in these devices is challenging. Here, we investigate ultrahigh-Q factor TD resonances at terahertz frequencies arising from a distortion of symmetry-protected bound states in the continuum (BIC) in all-dielectric metasurface consisting of an array of high-index tetramer clusters. By elaborately arranging the cylinders forming an asymmetric cluster, two distinct TD resonances governed by BIC are excited and identified. One is distinguished as intracluster TD mode that occurs in the interior of tetramer cluster, and the other one is intercluster TD mode that arises from the two neighboring clusters. Such TD resonances can be turned into ultrahigh-Q leaky resonances by controlling the asymmetry of cluster. The low-loss TD resonances with extremely narrow linewidth are very sensitive to the change in the refractive index of the surrounding media, achieving ultrahigh sensitivity level of 489 GHz/RIU. These findings will open up an avenue to develop ultrasensitive photonic sensor in the terahertz regime.

scholarly journals Engineering a light–matter strong coupling regime in perovskite-based plasmonic metasurface: quasi-bound state in the continuum and exceptional points

2020 ◽  
Vol 8 (12) ◽  
pp. A91 ◽  
Author(s):  
Leran Lu ◽  
Quynh Le-Van ◽  
Lydie Ferrier ◽  
Emmanuel Drouard ◽  
Christian Seassal ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Bound State ◽  
Strong Coupling Regime ◽  
Exceptional Points ◽  
The Continuum ◽  
Quasi Bound State

scholarly journals Brewster quasi bound states in the continuum in all-dielectric metasurfaces from single magnetic-dipole resonance meta-atoms

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Diego R. Abujetas ◽  
Ángela Barreda ◽  
Fernando Moreno ◽  
Juan J. Sáenz ◽  
Amelie Litman ◽  
...  
Keyword(s):  
Plane Wave ◽  
Magnetic Dipole ◽  
Bound States ◽  
Normal Incidence ◽  
High Refractive Index ◽  
Electromagnetic Spectrum ◽  
Dipole Resonance ◽  
Microwave Regime ◽  
Q Factors ◽  
The Continuum

Abstract Bound states in the continuum (BICs) are ubiquitous in many areas of physics, attracting special interest for their ability to confine waves with infinite lifetimes. Metasurfaces provide a suitable platform to realize them in photonics; such BICs are remarkably robust, being however complex to tune in frequency-wavevector space. Here we propose a scheme to engineer BICs and quasi-BICs with single magnetic-dipole resonance meta-atoms. Upon changing the orientation of the magnetic-dipole resonances, we show that the resulting quasi-BICs, emerging from the symmetry-protected BIC at normal incidence, become transparent for plane-wave illumination exactly at the magnetic-dipole angle, due to a Brewster-like effect. While yielding infinite Q-factors at normal incidence (canonical BIC), these are termed Brewster quasi-BICs since a transmission channel is always allowed that slightly widens resonances at oblique incidences. This is demonstrated experimentally through reflectance measurements in the microwave regime with high-refractive-index mm-disk metasurfaces. Such Brewster-inspired configuration is a plausible scenario to achieve quasi-BICs throughout the electromagnetic spectrum inaccessible through plane-wave illumination at given angles, which could be extrapolated to other kind of waves.

Magnetic Quasi-Bound State in the Continuum for Wireless Power Transfer

2021 ◽  
Vol 15 (4) ◽  
Author(s):  
Yaozu Xie ◽  
Zhanyuan Zhang ◽  
Ye Lin ◽  
Tianhua Feng ◽  
Yi Xu
Keyword(s):  
Wireless Power Transfer ◽  
Bound State ◽  
Power Transfer ◽  
Wireless Power ◽  
The Continuum ◽  
Quasi Bound State

Lower Bound for ppK– Quasi-Bound State Energy

2020 ◽  
Vol 51 (5) ◽  
pp. 979-987 ◽  
Author(s):  
I. Filikhin ◽  
B. Vlahovic
Keyword(s):  
Lower Bound ◽  
State Energy ◽  
Bound State ◽  
Bound State Energy ◽  
Quasi Bound State

scholarly journals Near-Field Excitation of Bound States in the Continuum in All-Dielectric Metasurfaces through a Coupled Electric/Magnetic Dipole Model

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 998
Author(s):  
Diego R. Abujetas ◽  
José A. Sánchez-Gil
Keyword(s):  
Magnetic Dipole ◽  
Density Of States ◽  
Bound States ◽  
Local Density ◽  
Near Field ◽  
Field Pattern ◽  
Local Density Of States ◽  
Optical Modes ◽  
Source Excitation ◽  
The Continuum

Resonant optical modes arising in all-dielectric metasurfaces have attracted much attention in recent years, especially when so-called bound states in the continuum (BICs) with diverging lifetimes are supported. With the aim of studying theoretically the emergence of BICs, we extend a coupled electric and magnetic dipole analytical formulation to deal with the proper metasurface Green function for the infinite lattice. Thereby, we show how to excite metasurface BICs, being able to address their near-field pattern through point-source excitation and their local density of states. We apply this formulation to fully characterize symmetry-protected BICs arising in all-dielectric metasurfaces made of Si nanospheres, revealing their near-field pattern and local density of states, and, thus, the mechanisms precluding their radiation into the continuum. This formulation provides, in turn, an insightful and fast tool to characterize BICs (and any other leaky/guided mode) near fields in all-dielectric (and also plasmonic) metasurfaces, which might be especially useful for the design of planar nanophotonic devices based on such resonant modes.

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