FDTD simulation of the optical properties for a gold nanoparticle-over-nanosheet hybrid structure

Chen, Yu; Wang, Jie; Xu, Tao; Liu, Min; Liu, Jinxin; Huang, Han; Ouyang, Fangping

doi:10.1016/j.cap.2019.12.005

Cited by 15 publications

(3 citation statements)

References 26 publications

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“…The finite difference time domain (FDTD) method is employed to simulate and study the EMWs' transmission properties within this remote-controllable, plasmonic refractive-index-sensitive and rake-like MIM waveguide. It is because that there are many advantages for FDTD method in solving electromagnetic problems, such as high efficiency, great accuracy and being able to directly obtain the time domain distributions of the electromagnetic field [34,35].…”

Section: Fdtd Modelling Computational Detailsmentioning

confidence: 99%

Remote-controllable refractive-index-sensitive plasmonic waveguide and rake-like switch: designs and FDTD simulations

Fan,

Yang,

Chen

et al. 2024

Phys. Scr.

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A refractive-index-sensitive plasmonic waveguide, whose transmission characteristics could be controlled remotely by a rake-like switch design, is theoretically studied in the reported work. The distance from the remote control unit to the bus waveguide is more than 0.25 μm, and it still possesses great efficiency even when the distance is increased to 0.535 μm. The switch basically contains two main sections. The first is on the bottom and next to the bus waveguide which functions as a plasmonic resonator that can induce localized surface plasmon resonance (LSPR) and restrict wave propagation at corresponding resonant frequency. The second is on the top and far away from the bus waveguide which functions as a remote controller that can modulate LSPR frequency in the first section. The refractive-index-dependent transmission spectra of this filter were simulated using finite-difference time-domain method. The results have shown that even at a distance as far as 0.5 μm, the ON/OFF switching of the wave propagation in a bus waveguide can still be modulated by adjusting the refractive index of a remote rectangular controller. With only 0.08 difference in refractive index, it could be obtained an on-off switching ratio of 18.7, 20.4 and 25.7 respectively for different waveguides at visible and near infrared wavelength, which shows great potential applications in refractive index sensors and remote-controllable band-stop filters.

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Section: Fdtd Modelling Computational Detailsmentioning

confidence: 99%

Remote-controllable refractive-index-sensitive plasmonic waveguide and rake-like switch: designs and FDTD simulations

Fan,

Yang,

Chen

et al. 2024

Phys. Scr.

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“…Most recently, Chen et al reported a simple two-step approach [ 4 , 19 , 20 , 21 ], which could synthesize two-dimensional HGNSs, as shown in Figure 1 d–h. HGNS could grow epitaxially from a solid gold nanosheet (SGNS, as shown in Figure 1 a–c and Figure S1a–c ) in the liquid phase, and it commonly contains a regular or irregular hollow cavity formed concentrically in the center of itself (see Figure 1 d–h).…”

Section: Introductionmentioning

confidence: 99%

Optical Control of the Localized Surface Plasmon Resonance in a Heterotype and Hollow Gold Nanosheet

Chen

Yin

et al. 2023

Nanomaterials

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The remote excitation and remote-controlling of the localized surface plasmon resonance (LSPR) in a heterotype and hollow gold nanosheet (HGNS) is studied using FDTD simulations. The heterotype HGNS contains an equilateral and hollow triangle in the center of a special hexagon, which forms a so-called hexagon–triangle (H–T) heterotype HGNS. If we focus the incident-exciting laser on one of the vertexes of the center triangle, the LSPR could be achieved among other remote vertexes of the outer hexagon. The LSPR wavelength and peak intensity depend sensitively on factors such as the polarization of the incident light, the size and symmetry of the H–T heterotype structure, etc. Several groups of the optimized parameters were screened out from numerous FDTD calculations, which help to further obtain some significant polar plots of the polarization-dependent LSPR peak intensity with two-petal, four-petal or six-petal patterns. Remarkably, based on these polar plots, the on-off switching of the LSPR coupled among four HGNS hotspots could be remote-controlled simply via only one polarized light, which shows promise for its potential application in remote-controllable surface-enhanced Raman scattering (SERS), optical interconnects and multi-channel waveguide switches.

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“…The finite difference time domain (FDTD) method has been developed with FDTD Solutions which is an electromagnetic wave simulation software based on the solution of Maxwell's equations [25]. It has the characteristics of intuitive graphical interface, simple parameter design, and powerful simulation capabilities [26]. It is widely used in the cutting-edge research based on electromagnetic fields, which can calculate the distribution of electromagnetic fields at different positions in space at different times without considering the shape constraints of materials [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

FDTD-Based Study on Equivalent Medium Approximation Model of Surface Roughness for Thin Films Characterization Using Spectroscopic Ellipsometry

Cui

Bian

et al. 2022

Photonics

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Spectroscopic ellipsometry (SE) is an effective method to measure the optical constants of thin film materials which is very sensitive to the surface topography of thin films. When performing ellipsometric measurements of the optical constants of solid materials with rough surfaces, the equivalent medium approximation (EMA) model is often used to characterize the surface topography. The EMA model is determined by two parameters of equivalent thickness dEMA and the void volume fraction f. In most applications, the void volume fraction parameter f is always set to an empirical 50% without any instructions, and then the thickness parameter dEMA is determined by fitting. In order to improve the accuracy of the fitting results, it is necessary to validate the construction law of the EMA model in the ellipsometry analysis considering characteristic parameters of the actual surface topography. In this paper, the influence of the surface topographical parameters on EMA model is analyzed. The method of FDTD (finite difference time domain) is employed to simulate the SiO2 films with different topographical parameters and EMA model are carried out on these samples. The analysis results show that the EMA model constructed with dEMA = σ + 0.80 h (σ: the root mean square height, h: the average height) can better fit the SE parameters. The proposed method can facilitate a better understanding and utilization of the EMA model in SE application.

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FDTD simulation of the optical properties for a gold nanoparticle-over-nanosheet hybrid structure

Cited by 15 publications

References 26 publications

Remote-controllable refractive-index-sensitive plasmonic waveguide and rake-like switch: designs and FDTD simulations

Remote-controllable refractive-index-sensitive plasmonic waveguide and rake-like switch: designs and FDTD simulations

Optical Control of the Localized Surface Plasmon Resonance in a Heterotype and Hollow Gold Nanosheet

FDTD-Based Study on Equivalent Medium Approximation Model of Surface Roughness for Thin Films Characterization Using Spectroscopic Ellipsometry

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