Near-Field Broadband Light Transparency via Tunneling and Cavity Effects

2014 ◽  
Vol 936 ◽  
pp. 639-642
Author(s):  
Xiang Nan Zhang ◽  
Gui Qiang Liu ◽  
Zheng Qi Liu ◽  
Yuan Hao Chen
Keyword(s):  
Finite Difference Time Domain ◽  
Metal Film ◽  
Near Field ◽  
Resonance Effect ◽  
Coupled Model ◽  
Model Structure ◽  
Transparent Conductor ◽  
Potential Applications ◽  
Cavity Effects ◽  
Difference Time

This work presents a broadband optical transparency structure consisting of a metal film perforated by an array of strip cavities. We theoretically demonstrate the metal film with side-coupled grooves system in model structure by the coupled model theory. The transparent light with a great bandwidth is obtained as a result of the tunneling and the resonance effect of the cavities by employing the finite-difference time-domain method simulation. By changing the parameter of the grooves in the structure, the transparency property shows a great adjustment in both wavelength and bandwidth. These structures have potential applications for transparent conductor devices.

scholarly journals Metasurface of Combined Semicircular Rings with Orthogonal Slit Pairs for Generation of Dual Vector Beams

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1718
Author(s):  
Qian Kong ◽  
Manna Gu ◽  
Xiangyu Zeng ◽  
Rui Sun ◽  
Yuqin Zhang ◽  
...  
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Polarized Light ◽  
Orientation Angle ◽  
Fdtd Simulation ◽  
Dual Vector ◽  
Vector Beams ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Difference Time

Manipulation of multichannel vector beams (VBs) with metasurfaces is an important topic and holds potential applications in information technology. In this paper, we propose a novel metasurface for the generation of dual VBs, which is composed of orthogonal slit pairs arranged on multiple groups of combined semicircular rings (CSRs). A group of CSRs include a right-shifted set and a left-shifted set of semicircular rings, and each set of semicircular rings has two halves of circles with different radii, sharing the same shifted center. Under the illumination of linearly polarized light, the two shifted sets of semicircular rings generate the two VBs at the shifted center positions on the observation plane. The slit units of each set are designed with independent rotation order and initial orientation angle. By adjusting the linear polarization of illumination, both two VBs with their orders and polarization states are independently controlled simultaneously. The principle and design are demonstrated by the finite-difference time domain (FDTD) simulation. The work is of significance for miniatured devices of VB generators and for related applications.

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.

Localized Surface Plasmon Resonance of Single Silver Nano-Hemisphere

2013 ◽  
Vol 818 ◽  
pp. 137-140
Author(s):  
Rui Li ◽  
Kun Liu ◽  
Shi Pan ◽  
Jian Hua Ding
Keyword(s):  
Surface Plasmon Resonance ◽  
Finite Difference ◽  
Surface Plasmon ◽  
Time Domain ◽  
Plasmon Resonance ◽  
Finite Difference Time Domain ◽  
Localized Surface Plasmon Resonance ◽  
Resonance Effect ◽  
Localized Surface Plasmon ◽  
Difference Time

In this work, we use 3D finite difference time domain (3D-FDTD) to calculate the plasmon resonance effect for a single silver hemisphere in which the palsmon line shape have distinct peaks when the particles are located on a glass substrate. The dependence of the resonance on hemisphere size and the ratio of height over radius are characterized, and it is found that the surface interface effect played an important role on the plasman resonace effect for a single silver hemisphere.

Localized Light Focusing and Super Resolution Readout via Chalcogenide Thin Film

2006 ◽  
Vol 918 ◽  
Author(s):  
Junji Tominaga ◽  
Paul Fons ◽  
Takayuki Shima ◽  
Kazuma Kurihara ◽  
Takashi Nakano ◽  
...  
Keyword(s):  
Finite Difference Time Domain ◽  
Near Field ◽  
Super Resolution ◽  
Spot Size ◽  
Optical Disc ◽  
Chalcogenide Film ◽  
Fdtd Simulations ◽  
Light Focusing ◽  
Difference Time ◽  
Chalcogenide Thin Film

AbstractWe have demonstrated that certain chalcogenide layers within a spinning super-RENS optical disc allow to squeeze the 650 nm laser beam to a spot size as fine as 50 nm using a 15-nm chalcogenide film. The near-field light was focused at a depth of just over 30 nm after passing through a chalcogenide film. Finite-difference time-domain (FDTD) simulations also reproduced these results. We suggest that a conductive ring aperture generated in the chalcogenide layers plays an important role in the localized light focusing.

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