Theme:     ~ 7 title(s) found

Young's Double-slit Experiment in the Nanoworld
Submitted on 28-MAR-08
Contributed by Maxim Sukharev, Tamar Seideman

Simulations of Young's double-slit experiment for thin metal films with nano-scaled slits show basic concepts of interference and diffraction of electromagnetic waves beoynd the diffraction limit, i.e. when the incident wavelength is much larger than a characteristic size of material system. In these simulations users may determine specific conditions, at which conventional double-slit experiment does not produce interference patterns. The latter is related to optical transparency of metal that ...

Diffraction by a Metal Nanoparticle
Submitted on 28-MAR-08
Contributed by Umberto Ravaioli, Maxim Sukharev, Hyung-Seok Hahm, Tamar Seideman

Interactive Java applet based on exact numerical integrations of Maxwell equations simulates interaction of external electromagnetic radiation with a metal nanoparticle. User may change various parameters such as incident wavelength, size of nanoparticle, material of nanoparticle (silver, gold, or perfect electric conductor). At some certain physical parameters nanoparticle exhibits strong scattering/absorption of electromagnetic energy via excitation of localized surface plasmons....

Interactive java applet: Interaction of electromagnetic plane wave and nanoscale silver metal film with subwavelength slit
Submitted on 16-APR-07
Contributed by Umberto Ravaioli, Maxim Sukharev, Tamar Seideman

This interactive java applet, based upon an exact solution of Maxwell equations on a grid, illustrates the dynamics of light-matter interactions in the nanoscale. An electromagnetic plane wave is generated on the left side of the film (see figure below) and propagated in the x-direction. The metallic film is simulated by the Drude model with a material dispersion......

A Wavelength Calculator Applet - version 2.0
Submitted on 14-NOV-06
Contributed by Umberto Ravaioli

The Wavelength Calculator applet provides an interactive way to explore the spectrum of electromagnetic radiation and evaluate the wavelength by varying the frequency. This applet is written in JAVA 2.0 and it will run on any recent web browser with the appropriate Java plug-in installed....

Photonic Band Gap
Submitted on 02-MAY-06
Contributed by Boyang Liu, Seng-tiong Ho

Photonic band gap (PBG) materials are crystalline structures that exclude light transmission in all directions for specific wavelength ranges, just as semiconductors exclude electron propagation for certain energy bands. It could be achieved by the creation of a periodicity in the refractive indices of dielectric materials......

Diffraction, Interference and Young's Double Slit Experiment
Submitted on 02-MAY-06
Contributed by Boyang Liu, Seng-tiong Ho

Plane waves of light incident on screens with single slits and double slits are classic examples used to illustrate diffraction and interference effects in light waves. This simple educational tool simulates these double slit experiments for a variety of parameters such as, different slit size, different silt distance and incident light wavelength. The simulation is in the nanoscale......

Detection of Surface Plasmon Waves
Submitted on 02-MAY-06
Contributed by Maxim Sukharev, Tamar Seideman

Surface plasmon waves are charge density waves occurring at an interface between a thin metallic film and an insulator medium. Two conditions are needed for the excitation of plasmon waves: The dielectric constant of the non-metal medium should be real and positive; The real part of the metal dielectric constant should be negative and its absolute value should be greater than its imaginary part; The wave can be thought of as having a section in the thin film and a section out of the film, at the...