Silicon-based glancing incidence reflection superposition lens

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)34-42
Journal / PublicationProceedings of SPIE - The International Society for Optical Engineering
Volume4785
Publication statusPublished - 2002
Externally publishedYes

Conference

TitleAdvances in Neutron Scattering Instrumentation
PlaceUnited States
CitySeattle, WA
Period7 - 8 July 2002

Abstract

Many topics of interest for neutron scattering demand small sampling volumes. Then the scattering instruments should include focusing devices in order to deliver a sharp spatially shaped neutron beam at the sample position. Moreover the wavelength bandwidth should be sufficiently large if time-of-flight method is used. In this contribution a new compact focusing device is proposed. The device is made of a stack of bent silicon wafers, each having a glancing reflective layer deposited on one side and a neutron absorbing layer on the other side. This device acts as a lens by superposing the images delivered by individual mirrors. The aberrations are minimized due to the short length of the device. From this point of view this type of superposition lens is equivalent to a long elliptic or parabolic mirror. Consequently a two dimensional focusing could be obtained by combining two devices in a Kirkpatrik-Baez set-up. Basic design principles are described and Monte-Carlo simulation results are presented. Possible applications in neutron instrumentation are reviewed.

Research Area(s)

  • Neutron optics, Neutron scattering instrumentation, Pulsed neutron source, Supermirror