Metal-Graphene Hybrid Terahertz Metasurfaces Based on Bound States in the Continuum (Bic) and Quasi-Bic for Dynamic Near-Field Imaging

2021 ◽  
Author(s):  
Fuyu Li ◽  
Yuanxun Li ◽  
Tingting Tang ◽  
Yulong Liao ◽  
Yongcheng Lu ◽  
...  
Keyword(s):  
Bound States ◽  
Near Field ◽  
Near Field Imaging ◽  
Field Imaging ◽  
The Continuum

scholarly journals Unveiling the Symmetry Protection of Bound States in the Continuum with Terahertz Near-Field Imaging

ACS Photonics ◽  
2021 ◽  
Author(s):  
Niels J.J. van Hoof ◽  
Diego R. Abujetas ◽  
Stan E.T. ter Huurne ◽  
Francesco Verdelli ◽  
Giel C.A. Timmermans ◽  
...  
Keyword(s):  
Bound States ◽  
Near Field ◽  
Near Field Imaging ◽  
Field Imaging ◽  
The Continuum

scholarly journals Efficient Near-Field Imaging Using Cylindrical MIMO Arrays

2021 ◽  
pp. 1-1
Author(s):  
Shiyong Li ◽  
Shuoguang Wang ◽  
Moeness G. Amin ◽  
Guoqiang Zhao
Keyword(s):  
Near Field ◽  
Near Field Imaging ◽  
Mimo Arrays ◽  
Field Imaging

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.

Ultra-Wide Band Near-Field Imaging System

2007 ◽  
Author(s):  
Anatoliy O. Boryssenko ◽  
Christophe Craeye ◽  
Daniel H. Schaubert
Keyword(s):  
Imaging System ◽  
Near Field ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Near Field Imaging ◽  
Field Imaging

A metal-dielectric antenna for terahertz near-field imaging

2005 ◽  
Vol 98 (1) ◽  
pp. 014910 ◽  
Author(s):  
N. Klein ◽  
P. Lahl ◽  
U. Poppe ◽  
F. Kadlec ◽  
P. Kužel
Keyword(s):  
Near Field ◽  
Dielectric Antenna ◽  
Near Field Imaging ◽  
Field Imaging

Three-Dimensional Finite-Difference Time-Domain Method Modeling of Nanowire Optical Probe

2014 ◽  
Vol 602-605 ◽  
pp. 3359-3362
Author(s):  
Chun Li Zhu ◽  
Jing Li
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Incident Light ◽  
Near Field ◽  
Three Dimensional ◽  
Polarization Direction ◽  
Near Field Imaging ◽  
Difference Time ◽  
Field Imaging

In this paper, output near fields of nanowires with different optical and structure configurations are calculated by using the three-dimensional finite-difference time-domain (3D FDTD) method. Then a nanowire with suitable near field distribution is chosen as the probe for scanning dielectric and metal nanogratings. Scanning results show that the resolution in near-field imaging of dielectric nanogratings can be as low as 80nm, and the imaging results are greatly influenced by the polarization direction of the incident light. Compared with dielectric nanogratings, metal nanogratings have significantly enhanced resolutions when the arrangement of gratings is perpendicular to the polarization direction of the incident light due to the enhancement effect of the localized surface plasmons (SPs). Results presented here could offer valuable references for practical applications in near-field imaging with nanowires as optical probes.

Near-field exciton imaging of chemically treated MoS2 monolayers

Nanoscale ◽  
2018 ◽  
Vol 10 (18) ◽  
pp. 8851-8858 ◽  
Author(s):  
Youngbum Kim ◽  
Yongjun Lee ◽  
Hyun Kim ◽  
Shrawan Roy ◽  
Jeongyong Kim
Keyword(s):  
Near Field ◽  
Exciton Emission ◽  
Chemical Treatments ◽  
Near Field Imaging ◽  
Chemically Treated ◽  
Mos2 Monolayers ◽  
Field Imaging

Modification of local exciton emission in monolayer MoS2 by chemical treatments is spatially uneven as revealed by near field imaging.

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