Finite Difference Time Domain Computation of Light Scattering by Multiple Colloidal Particles

Palkar, Saurabh A.; Ryde, Niels; Schure, Mark R.; Gupta, Neelam; Cole, James B.

doi:10.1021/la971057a

Cited by 16 publications

(11 citation statements)

References 16 publications

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“…We have verified the HASP code a number of different ways. Simulations of Mie scattering from cylinders 20 and spheres 21 reproduce the analytic results to about 2% even on a coarse ͑ /10͒ grid. ͑Here we are using about a / 100 grid͒.…”

Section: Model Systemmentioning

confidence: 57%

Enhanced transmission with coaxial nanoapertures: Role of cylindrical surface plasmons

Haftel

Schlockermann

Blumberg³

2006

Phys. Rev. B

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We simulate the optical fields and optical transmission through nanoarrays of silica rings embedded in thin gold films using the finite-difference-time-domain method. By examining the optical transmission spectra for varying ring geometries we uncover large enhancements in the transmission at wavelengths much longer than the usual cutoffs for cylindrical apertures or where the usual planar surface plasmons or other periodic effects from the array could play a role. We attribute these enhancements to closely coupled cylindrical surface plasmons on the inner and outer surfaces of the rings, and this coupling is more efficient as the inner and outer ring radii approach each other. We confirm this hypothesis by comparing the transmission peaks of the simulation with cylindrical surface plasmon ͑CSP͒ dispersion curves calculated for the geometries of interest. One important result is that a transmission peak appears in the simulations close to the frequency where the longitudinal wave number k z in the ring satisfies k z = m / L, where m is an integer and L the length of the aperture, for a normal CSP TE 1 or TM 1 mode. The behavior of the CSP dispersion is such that propagating modes can be sent through the rings for ever longer wavelengths as the ring radii approach, whereas the transmission decreases only in proportion to the ring area.

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Section: Model Systemmentioning

confidence: 57%

Enhanced transmission with coaxial nanoapertures: Role of cylindrical surface plasmons

Haftel

Schlockermann

Blumberg³

2006

Phys. Rev. B

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“…The technique involves approximating the integration of Maxwell's equations in real space by the use of finite differences. Specifically, the FDTD is a “time marching” algorithm used to solve the wave equation at each point on a grid . The field is set to zero at the initial time step, and at the next time step, a source is turned on to generate an optical signal.…”

Section: Introductionmentioning

confidence: 99%

Computer Simulation of Morphologies and Optical Properties of Filled Diblock Copolymers

2003

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We integrate two computational techniques in order to determine the optical properties of self-assembled mixtures of diblock copolymers and nanoparticles. To determine the morphology of the system, we first use an approach that combines a self-consistent-field theory (SCFT) for the diblocks with a density functional theory (DFT) for the particles. Using this SCF/DFT model, we focus on the lamellar phase of AB diblocks and calculate volume fraction profiles for systems containing selective or nonselective nanoparticles. We use the volume fraction profiles from the SCF/DFT and assign typical dielectric constants for the different polymer domains and the particles to characterize the dielectric properties of the composite. A finite difference time domain (FDTD) technique is then used to simulate the propagation of light through this heterogeneous material. The results of this study allow us to determine how the polymer-particle interactions affect the spatial distribution of fillers within the polymer matrix and how this distribution in turn affects the optical properties of the nanocomposite. The findings can provide guidelines for facilitating the design of photonic band gap materials.

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“…The square and triangular helix structures are illuminated by circular polarized wave in the wavelength ranges , respectively at incidence angle of φ=0 to the zaxis with polarization in the direction of the xaxis. The calculations are performed with 3D finite difference time domain (FDTD) [32].…”

Section: Structure and Analysis Methodsmentioning

confidence: 99%

Sensitivity of Silver Square and Triangular Chiral Plasmon Nanosensors

Kabiri

Azarian

2021

IJOP

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Plasmonic nanosensors have emerged as a powerful tool for biosensing and other applications. Therefore, efforts are underway to achieve higher sensitivity for these nanosensors. In line with this goal, we have investigated the sensitivity of silver square and triangular chiral nanosensors based on two strategies, Localized Surface Plasmon Resonance (LSPR)-based and Circular Dichroism (CD)-based sensing. Chiral nanostructure parameters (height, diameter) and the angle of incidence light have been optimized with calculation method (3-D finitedifference time-domain (3-D-FDTD)) in order to obtain best localized surface plasmon resonance and consequently the highest sensitivity. The calculation results show that sensitivitys~1727 and 1658nmRIU -1 can be achieved in LSPR-and CD-based sensing method respectively for square chiral nanostructure, which are significantly more than previous works.

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Finite Difference Time Domain Computation of Light Scattering by Multiple Colloidal Particles

Cited by 16 publications

References 16 publications

Enhanced transmission with coaxial nanoapertures: Role of cylindrical surface plasmons

Enhanced transmission with coaxial nanoapertures: Role of cylindrical surface plasmons

Computer Simulation of Morphologies and Optical Properties of Filled Diblock Copolymers

Sensitivity of Silver Square and Triangular Chiral Plasmon Nanosensors

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