Discrete Dipole Approximation (DDA) is an important tool in plasmonics research. Using DDA, one can calculate scattering properties of nanoparticles at various wavelengths, polarizations and surrounding medium. The specialty of DDA is that one can calculate scattering properties of irregular shape particles (particles other than spheroids). DDA is based on …

nmie tool on Nanohub.org. This tool calculates the extinction, scattering, and absorption efficiencies of single nanoparticle (1 layer),core-shell nanoparticle (2 layer) and nanomatryushka nanoparticle (3 layer) using MIE formulation.

Since 2009, I have been a regular user of Nanohub.org. www.Nanohub.orgis a website that provides …

One can use Beamer to make high quality presentations using Latex code. To know more about beamer and its capabilities visit hereand here.

Beamer comes with a set of default templates. However,it has capability to design new themes.

Here, I will maintain a list of beamer themes shared …

To insert a title to the colorbar in matlab. 

Use the following code (Source):

% Loads a data for the example 
load mandrill

% Plots an image for the example 
image(X)

% Inserts a colorbar. a handle is created 
t=colorbar;

% sets the ylabel property of the handle t. 
set(get(t …

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 …

I am playing with Python for the first time. The syntax seems to be so natural. So many modules (numpy, scipy and matplotlib) for researchers/scientists. Cannot see any shortcoming at this point. Perhaps need more testing and implementation.

The electric field from an oscillating dipole is given by:, where [tex]\hat{r}[/tex] is the position vector, [tex] \omega [/tex] is the frequency of dipole oscillation, [tex]\textbf{p}[/tex] is the dipole moment. The two terms in the electric field consists of 1) near field (area near …

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 …

In matlab, sometimes I prefer to plot a image for mesh data instead of surf and use view(2) (view(2) gives the top view of the surface plot). However,
imagesc(x,y,z) shading 'interp'
does not work. This problem can be solved by using:
pcolor(x,y,z …

[caption id="attachment_263" align="aligncenter" width="300"] Propagation of surface plasmons[/caption]

Surface plasmons (SP's) are electromagnetic waves that propagate at the interface between metals (such as Ag, Au ) and dielectric material. Here I have simulated the propagation of surface plasmons on Ag-air interface, the color indicates the magnitude of …