Resonant Excitation Analysis on Asymmetrical Lateral Leakage of Light in Finite Zero-Contrast Grating Mirror

Sang, Tian; Yin, Xin; Qi, Honglong; Gao, Jian; Niu, Xinshang; Jiao, Hongfei

doi:10.1109/jphot.2020.2977860

Cited by 15 publications

(8 citation statements)

References 33 publications

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“…There are different kinds of BICs, classified by their physical origins and constructing methods, including BICs from symmetry or separability, from parameter tuning in resonance systems, and from inverse construction. [ 163 ] BICs and quasi‐BICs have been found in photonic systems such as PC slabs, [ 164–203 ] gratings, [ 204–219 ] metamaterials, [ 220–227 ] coupled waveguide arrays, [ 228–230 ] array of spheres or rods. [ 231–234 ] Here, we will mainly introduce the topology of BICs in PCs.…”

Section: Physics and Designs Of Topological Photonic Crystalsmentioning

confidence: 99%

Topological Photonic Crystals: Physics, Designs, and Applications

Tang

Shi

et al. 2022

Laser & Photonics Reviews

190

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Recent research in topological photonics has not only proposed and realized novel topological phenomena such as one-way broadband propagation and robust transport of light, but also designed and fabricated photonic devices with high-performance indexes, which are immune to fabrication errors such as defects or disorders. Photonic crystals, which are periodic optical structures with the advantages of good light field confinement and multiple adjusting degrees of freedom, provide a powerful platform to control the flow of light. With the topology defined in the reciprocal space, photonic crystals have been widely used to reveal different topological phases of light and demonstrate topological photonic functionalities. This review presents the physics of topological photonic crystals with different dimensions, models, and topological phases. The design methods of topological photonic crystals are introduced. Furthermore, the applications of topological photonic crystals in passive and active photonics are reviewed. These studies pave the way for applying topological photonic crystals in practical photonic devices.

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Section: Physics and Designs Of Topological Photonic Crystalsmentioning

confidence: 99%

Topological Photonic Crystals: Physics, Designs, and Applications

Tang

Shi

et al. 2022

Laser & Photonics Reviews

190

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“…As can be seen in Figure 3 b, there are two leaky mode resonances (LMRs) in the wavelength region of interest as s = 0; the LMRs arise from the coupling between the diffracted orders and the waveguide modes, and the overlapping of the two LMRs will result in broadband reflection with high reflectivity [ 45 ]. However, two additional high-Q Fano resonances occurred as s = 10 nm, where BIC turns into quasi-BIC due to the symmetry-breaking of the structure [ 46 , 47 ]. At normal incidence, the BIC mode can be completely decoupled from the radiation continuum due to its different symmetry, while it can be leaky by breaking the symmetry of the structure [ 48 , 49 ].…”

Section: Basic Principles and Cmt For Absorption Enhancement Of Grmentioning

confidence: 99%

Highly Efficient Light Absorption of Monolayer Graphene by Quasi-Bound State in the Continuum

et al. 2021

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Graphene is an ideal ultrathin material for various optoelectronic devices, but poor light–graphene interaction limits its further applications particularly in the visible (Vis) to near-infrared (NIR) region. Despite tremendous efforts to improve light absorption in graphene, achieving highly efficient light absorption of monolayer graphene within a comparatively simple architecture is still urgently needed. Here, we demonstrate the interesting attribute of bound state in the continuum (BIC) for highly efficient light absorption of graphene by using a simple Si-based photonic crystal slab (PCS) with a slit. Near-perfect absorption of monolayer graphene can be realized due to high confinement of light and near-field enhancement in the Si-based PCS, where BIC turns into quasi-BIC due to the symmetry-breaking of the structure. Theoretical analysis based on the coupled mode theory (CMT) is proposed to evaluate the absorption performances of monolayer graphene integrated with the symmetry-broken PCS, which indicates that high absorption of graphene is feasible at critical coupling based on the destructive interference of transmission light. Moreover, the absorption spectra of the monolayer graphene are stable to the variations of the structural parameters, and the angular tolerances of classical incidence can be effectively improved via full conical incidence. By using the full conical incidence, the angular bandwidths for the peak absorptivity and for the central wavelength of graphene absorption can be enhanced more than five times and 2.92 times, respectively. When the Si-based PCS with graphene is used in refractive index sensors, excellent sensing performances with sensitivity of 604 nm/RIU and figure of merit (FoM) of 151 can be achieved.

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“…However, most of the dielectric nanostructures used to excite QBICs with high Q-factor are complicated, such as asymmetrical nanocrosses [20], asymmetrical nanorings [21], asymmetrical nanobars [22][23][24] and asymmetrical nanorods [25][26][27][28], which are challenging in fabrication due to the requirement of inserting the deep subwavelength slits [20][21][22][23][24] or nanoholes [25][26][27][28] into the photonic structures. Other nanostructures such as the reshaped rectangular bars [29,30] have the increased sharp edges, making them more difficult to be accurately fabricated through conventional lithographic techniques, which reduces the Q-factor and the resonance lifetime of the devices due to the opening of additional leaky channels [31,32]. Moreover, the tilted nanobars [33,34], another type of structures, have difficulties in precisely control of the orientation of the nanobars with the deep subwavelength spaces between the resonators maintained in nanofabrication process.…”

Section: Introductionmentioning

confidence: 99%

High-quality-factor dual-band Fano resonances induced by dual bound states in the continuum using a planar nanohole slab

Sang

Yao

et al. 2021

Nanoscale Res Lett

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In photonics, it is essential to achieve high-quality (Q)-factor resonances to improve optical devices’ performances. Herein, we demonstrate that high-Q-factor dual-band Fano resonances can be achieved by using a planar nanohole slab (PNS) based on the excitation of dual bound states in the continuum (BICs). By shrinking or expanding the tetramerized holes of the superlattice of the PNS, two symmetry-protected BICs can be induced to dual-band Fano resonances and their locations as well as their Q-factors can be flexibly tuned. Physical mechanisms for the dual-band Fano resonances can be interpreted as the resonant couplings between the electric toroidal dipoles or the magnetic toroidal dipoles based on the far-field multiple decompositions and the near-field distributions of the superlattice. The dual-band Fano resonances of the PNS possess polarization-independent feature, and they can be survived even when the geometric parameters of the PNS are significantly altered, making them more suitable for potential applications.

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Resonant Excitation Analysis on Asymmetrical Lateral Leakage of Light in Finite Zero-Contrast Grating Mirror

Cited by 15 publications

References 33 publications

Topological Photonic Crystals: Physics, Designs, and Applications

Topological Photonic Crystals: Physics, Designs, and Applications

Highly Efficient Light Absorption of Monolayer Graphene by Quasi-Bound State in the Continuum

High-quality-factor dual-band Fano resonances induced by dual bound states in the continuum using a planar nanohole slab

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