Scattering / extinction / absorption cross-sections of silver nanowires (infinite cylinders) using meep

Posted on Wed 01 June 2011 in Plasmonics • Tagged with electromagnetism, FDTD, MEEP, octave, photonics, Plasmonics

Particles scatter and absorb electromagnetic radiation. One often needs to compare the amount of scattering/absorption/extinction for particles of different shapes, composition, sizes and incident light properties (polarization, frequency and angle). In this regard, the concept of cross-sections comes into picture. There are three types of cross-sections, 1) scattering …

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Arbitrary 2d shapes in MEEP

Posted on Tue 10 May 2011 in Plasmonics • Tagged with electromagnetism, FDTD, MEEP, octave, photonics, Plasmonics

In MEEP (1.1.1), dielectric structures are often created by constructive geometry (adding and subtracting primitive shapes). The primitive shapes that are allowed are blocks, cylinders, ellipsoids and cones. To create a complex shape, one has to decompose the geometry into these primitive shapes. Over the weekend, I was …

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Plasmonic materials in MEEP

Posted on Wed 27 April 2011 in Plasmonics • Tagged with electromagnetism, FDTD, Free Software, Matlab, MEEP, octave, photonics, Plasmonics, SERS


The aim of this post is to share my experience in incorporating dielectric function of metals such as gold and silver into MEEP (a free finite difference time domain package) code. The incorporation is not an easy task and can be daunting for the first time user.

Metals such …

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Electric Field in Metal Nanoparticle Dimers

Posted on Sat 09 April 2011 in Plasmonics • Tagged with FDTD, Molecular Machines, photonics, Plasmonics, SERS

Metal nanoparticles exhibit localized surface plasmon resonance (LSPR). One can think of LSPR as resonance of electron sea oscillations driven by incident electric field. This is similar to the way a spring-mass system attains resonance under external periodic driving force.

The result of this plasmon resonance is enhanced dipole moment …

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Charge density in metal nanoparticles at plasmon resonance

Posted on Tue 23 November 2010 in Plasmonics • Tagged with electromagnetism, FDTD, Free Software, photonics, Plasmonics

It is important to know the magnitude and distribution of electric field near the metallic nanoparticles at plasmon resonance. One can look at the electric field and say whether the plasmon mode is dipolar or higher order mode such as qudrapolar mode. At many times one is also interested to …

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WINSPALL software for surface plasmon resonance experiments

Posted on Wed 10 March 2010 in Plasmonics • Tagged with electromagnetism, Free Software, photonics, Plasmonics

One needs to fit the reflectivity curves obtained in surface plasmon resonance experiments with theoretical models. A free software (for non commercial use) called Winspall exactly does that.

According to the developers, WINSPALL is a PC based software which computes the reflectivity of optical multilayer systems. It is based on …

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Resources on Electromagnetics/Plasmonics/Nanophotonics

Posted on Tue 12 January 2010 in Plasmonics • Tagged with books, electromagnetism, FDTD, Free Software,, photonics, Plasmonics

These are some resources on Electromagnetics/plasmonics/nanophotonics

I will maintain a list of free resources on electromagnetics, plasmonics, nanophotonics, optics and other related topics here. If any of you (readers) know any other free resources related to this topic, please let me know and I can add into these …

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