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Related Concept Videos

Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...

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Related Experiment Video

Updated: Jun 22, 2026

Planar and Three-Dimensional Printing of Conductive Inks
10:49

Planar and Three-Dimensional Printing of Conductive Inks

Published on: December 9, 2011

Subwavelength imaging using conducting sheets.

Cesar Monzon1

  • 1Enig Associates, Inc., Bethesda, Maryland 20814, USA.

Physical Review Letters
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

Subwavelength imaging is achieved using resistive materials, overcoming spatial low-pass filtering limitations. This novel method allows for near-field imaging with potential applications across various wave phenomena.

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Area of Science:

  • Physics
  • Electromagnetism
  • Optics

Background:

  • Spatial limitations in traditional imaging systems.
  • Evanescent fields are typically attenuated by low-pass filtering in space.
  • Near-field imaging offers potential for subwavelength resolution.

Purpose of the Study:

  • To demonstrate subwavelength imaging using purely resistive means.
  • To explore the role of impedance sheets in overcoming spatial filtering effects.
  • To investigate the applicability of this phenomenon across different frequency regimes.

Main Methods:

  • Utilizing a thin layer of imperfectly conducting material (impedance sheet) adjacent to a source.
  • Analyzing the impedance matching between the conducting layer and the spatial low-pass filter.
  • Investigating the behavior of evanescent field components.

Main Results:

  • Achieved subwavelength imaging through resistive impedance sheets.
  • Demonstrated that the conducting layer prevents attenuation of evanescent components.
  • Showcased a trade-off between image definition and amplitude.
  • Confirmed the phenomenon holds for reactive sheets as well.

Conclusions:

  • Subwavelength imaging is achievable with simple resistive elements.
  • The findings are applicable from radio frequencies to optical regions.
  • This technique has broad implications for wave motion studies in physics.