Jump to content

File:Darkfieldaperture.gif

Page contents not supported in other languages.
This is a file from the Wikimedia Commons
From Wikipedia, the free encyclopedia

Darkfieldaperture.gif (285 × 146 pixels, file size: 805 KB, MIME type: image/gif, looped, 24 frames, 12 s)

Summary

Description Optical darkfield imaging in microscopy involves forming images using a back focal-plane (scattering angle) aperture that excludes the unscattered beam. It's called "dark field" because the field surrounding the specimen doesn't scatter, so it's dark. This digital darkfield animation illustrates by placing an aperture (centered in the orange figure at left) over the power spectrum (a digital substitute for the back focal-plane's optical diffraction pattern) shown with the DC peak (or unscattered beam) below center. In this example of 2nm metal particles distributed on a nano-cylinder, only nanocystals with projected periodicities that diffract into the aperture light up in the darkfield image at right and this varies with aperture position. The aperture is moving by 1.25 degree increments around the ring associated with diffraction from gold 2.3 Ångstrom (111) lattice spacings.
Date
Source Own work
Author P. Fraundorf

Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International, 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
You may select the license of your choice.

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

7 April 2008

image/gif

962a316f7f6899ff0ad0e684c08bb299093d2fe2

824,694 byte

12 second

146 pixel

285 pixel

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current17:46, 7 April 2008Thumbnail for version as of 17:46, 7 April 2008285 × 146 (805 KB)Unitsphere{{Information |Description=Optical darkfield imaging in microscopy involves forming images using a back focal-plane (scattering angle) aperture that excludes the unscattered beam. It's called "dark field" because the field surrounding the specimen doesn't

The following 2 pages use this file: