scholarly journals Bandwidth-tunable near-infrared perfect absorption of graphene in compound grating waveguide structure supporting quasi-bound state in the continuum

2021 ◽  
Author(s):  
Feng Wu ◽  
Dejun Liu ◽  
Shuyuan Xiao
Keyword(s):  
Near Infrared ◽  
Bound State ◽  
Waveguide Structure ◽  
Perfect Absorption ◽  
The Continuum ◽  
Quasi Bound State

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

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 484
Author(s):  
Tian Sang ◽  
Sina Abedini Dereshgi ◽  
Wisnu Hadibrata ◽  
Ibrahim Tanriover ◽  
Koray Aydin
Keyword(s):  
Light Absorption ◽  
Near Infrared ◽  
Structural Parameters ◽  
Bound State ◽  
Monolayer Graphene ◽  
Destructive Interference ◽  
Perfect Absorption ◽  
Central Wavelength ◽  
Highly Efficient ◽  
The Continuum

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.

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 Perfect absorption of flexural waves induced by bound state in the continuum

2021 ◽  
pp. 101364
Author(s):  
Liyun Cao ◽  
Yifan Zhu ◽  
Sheng Wan ◽  
Yi Zeng ◽  
Yong Li ◽  
...  
Keyword(s):  
Bound State ◽  
Flexural Waves ◽  
Perfect Absorption ◽  
The Continuum

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

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 Plasmonic hot-electron photodetection with quasi-bound states in the continuum and guided resonances

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wenhao Wang ◽  
Lucas V. Besteiro ◽  
Peng Yu ◽  
Feng Lin ◽  
Alexander O. Govorov ◽  
...  
Keyword(s):  
Bound States ◽  
Structural Parameters ◽  
Hybrid Structure ◽  
Fine Tuning ◽  
Hot Electrons ◽  
Hot Electron ◽  
Perfect Absorption ◽  
High Loss ◽  
Guided Mode ◽  
The Continuum

Abstract Hot electrons generated in metallic nanostructures have shown promising perspectives for photodetection. This has prompted efforts to enhance the absorption of photons by metals. However, most strategies require fine-tuning of the geometric parameters to achieve perfect absorption, accompanied by the demanding fabrications. Here, we theoretically propose a Ag grating/TiO2 cladding hybrid structure for hot electron photodetection (HEPD) by combining quasi-bound states in the continuum (BIC) and plasmonic hot electrons. Enabled by quasi-BIC, perfect absorption can be readily achieved and it is robust against the change of several structural parameters due to the topological nature of BIC. Also, we show that the guided mode can be folded into the light cone by introducing a disturbance to become a guided resonance, which then gives rise to a narrow-band HEPD that is difficult to be achieved in the high loss gold plasmonics. Combining the quasi-BIC and the guided resonance, we also realize a multiband HEPD with near-perfect absorption. Our work suggests new routes to enhance the light-harvesting in plasmonic nanosystems.

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