Advances in low-energy neutral-atom imaging techniques

Earl E. Scime, Herbert O. Funsten, David J. McComas, Kurt R. Moore, Michael A. Gruntman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Recently proposed low energy neutral atom (LENA) imaging techniques use a collisional process to convert the low energy neutrals into ions before detection. At low energies, collisional processes limit the angular resolution and conversion efficiencies of these devices. However, if the intense ultraviolet light background can be suppressed, direct LENA detection is possible. We present results from a series of experiments designed to develop a novel filtering structure based on free-standing transmission gratings. If the grating period is sufficiently small, free standing transmission gratings can be employed to substantially polarize ultraviolet (UV) light in the wavelength range 300 angstroms to 1500 angstroms. If a second grating is placed behind the first grating with its axis of polarization oriented at a right angle to the first's, a substantial attenuation of UV radiation is achievable. The neutrals will pass through the remaining open area of two gratings and be detected without UV background complications. We have obtained nominal 2000 angstroms period (1000 angstroms bars with 1000 angstroms slits) free standing, gold transmission gratings and measured their UV and atomic transmission characteristics. The geometric factor of a LENA imager based on this technology is comparable to that of other proposed LENA imagers.

Original languageEnglish (US)
Title of host publicationInstrumentation for Magnetospheric Imagery II
EditorsSupriya Chakrabarti
Number of pages9
ISBN (Electronic)9780819412577
StatePublished - Jul 7 1993
Externally publishedYes
EventInstrumentation for Magnetospheric Imagery II - San Diego, United States
Duration: Jul 11 1993Jul 16 1993

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceInstrumentation for Magnetospheric Imagery II
Country/TerritoryUnited States
CitySan Diego

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Advances in low-energy neutral-atom imaging techniques'. Together they form a unique fingerprint.

Cite this