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Related Concept Videos

Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.

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Related Experiment Video

Updated: Jul 7, 2026

Optical Trap Loading of Dielectric Microparticles In Air
08:57

Optical Trap Loading of Dielectric Microparticles In Air

Published on: February 5, 2017

Axial optical trapping efficiency through a dielectric interface.

Antonio Alvaro Ranha Neves1, Adriana Fontes, Carlos Lenz Cesar

  • 1National Nanotechnology Laboratory of CNR-INFM, Università del Salento, c/o Distretto Tecnologico ISUFI, via Arnesano I, Lecce, Italy. antonio.neves@unile.it

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 1, 2008
PubMed
Summary

This study explores axial optical trapping of microspheres. Incident polarization does not influence axial optical force, and aberration effects can calibrate bead position.

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Last Updated: Jul 7, 2026

Optical Trap Loading of Dielectric Microparticles In Air
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Published on: February 5, 2017

Optical Trapping of Nanoparticles
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Optical Trapping of Nanoparticles

Published on: January 15, 2013

Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
09:56

Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers

Published on: August 31, 2021

Area of Science:

  • Optics and Photonics
  • Optical Tweezers
  • Dielectric Interface Physics

Background:

  • Optical tweezers utilize focused laser beams to trap microscopic particles.
  • Understanding forces at dielectric interfaces is crucial for precise particle manipulation.
  • Aberrations in optical systems can affect trapping stability and calibration.

Purpose of the Study:

  • To investigate axial optical trapping forces at a dielectric interface.
  • To determine the influence of beam polarization and aberrations on trapping dynamics.
  • To develop a method for calibrating axial bead position using trapping efficiency ripples.

Main Methods:

  • Employing the angular spectrum representation and generalized Lorenz-Mie theory.
  • Calculating optical forces for non-paraxial, aberrated, axially symmetric beams.
  • Analyzing the interaction of focused beams with dielectric microspheres.

Main Results:

  • Axial optical force is independent of incident light polarization.
  • Aberration-induced ripples in trapping efficiency provide positional information.
  • An approximate expression for axial force near the microsphere was derived.

Conclusions:

  • Incident polarization is not a critical factor for axial optical force in this configuration.
  • The study offers a novel approach to calibrating axial position in optical tweezers.
  • Exploiting aberration effects enhances the precision of optical trapping experiments.