Plasmonic materials in MEEP

  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 as gold and silver have Read More …

Charge density in metal nanoparticles at plasmon resonance

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 know the surface charge density Read More …

Spoof Plasmons / Designer Surface Plasmons

Aim of this article/post: To 1) introduce the concept of Designer surface plasmons or Spoof plasmons and 2) Dispersion relations and Visualization of the fields using MEEP code. (Some of the text/simulations are taken from my paper in the area of DSPs.) Surface Plasmons are electromagnetic waves that travel at the interface of metals such Read More …

DDSCAT and electric field at plasmon resonance

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 representing a particle into a Read More …

Nmie: Extinction, Scattering and Absorption efficiencies of multilayer nanoparticles

Since 2009, I have been a regular user of Nanohub.org. www.Nanohub.org is a website that provides a platform for online simulation, research and teaching resources. Of interest is the ability to perform simulation online without installing software on your local computer. I envision that this type of cloud computing model will be the future of Read More …

WINSPALL software for surface plasmon resonance experiments

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 the Fresnel equations and the Read More …

My list of most used packages for ubuntu

To install octave, gnuplot,numpy,scipy,matplotlib,gcc-4.2-base, gfortran sudo apt-get install octave gnuplot \ ipython python-numpy python-scipy \ python-matplotlib wine gcc-4.2-base gfortran-4.2 To install graphics programs: gimp, imagmagick and inkscape sudo apt-get install inkscape gimp imagemagick To install most of the multimedia requirements  sudo apt-get install vlc mozilla-plugin-vlc gstreamer0.10-ffmpeg \ gstreamer0.10-fluendo-mp3 gstreamer0.10-fluendo-mpegdemux \ gstreamer0.10-plugins-ugly gstreamer0.10-plugins-ugly-multiverse \ gstreamer0.10-plugins-bad gstreamer0.10-plugins-bad-multiverse Read More …

Python

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. Some questions I am looking answers for: Is it faster than Fortran? If not faster, can it Read More …

Resources on Electromagnetics/Plasmonics/Nanophotonics

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 lists. Free books: Electromagnetic waves and Antennas Read More …