Related Experiment Video
Updated: Mar 7, 2026

Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
Published on: October 16, 2017
Coupled dipole approximation across the Γ-point in a finite-sized nanoparticle array
J-P Martikainen1, A J Moilanen1, P Törmä2
1COMP Centre of Excellence, Department of Applied Physics, Aalto University, PO Box 15100, 00076 Aalto, Finland.
Abstract:
We study the response of a finite-sized nanoparticle array to an incident field in the vicinity of the Γ-point of the lattice. Using the coupled dipole approximation, we find that the dipole distributions can be strongly inhomogeneous and that strong modulations appear as the energy is above the Γ-point. We highlight how this is reflected in real-space extinction efficiencies as well as in radiation patterns from the finite-sized array.This article is part of the themed issue 'New horizons for nanophotonics'.
Related Concept Videos
Calculations of Electric Potential II
Consider a...
¹H NMR: Long-Range Coupling
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
Gauss's Law: Problem-Solving
Electric Dipoles and Dipole Moment
Theoretically, studying electric dipoles leads to understanding why the resultant electric forces around us are weak. Since electric forces are strong, remnant net charges are rare. Hence, the interaction between dipoles helps us understand electrical interactions in...
Atomic Nuclei: Nuclear Relaxation Processes
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

