Repair of high performance multilayer coatings

Conference · Mon Jul 01 00:00:00 EDT 1991

OSTI ID:5921722

Gaines, D P ^[1]; Ceglio, N M ^[2]; Vernon, S P ^[3]; Krumrey, M; Mueller, P ^[4]

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1. Brigham Young Univ., Provo, UT (United States). Dept. of Physics and Astronomy
2. Lawrence Livermore National Lab., CA (United States)
3. Vernon Applied Physics, Torrance, CA (United States)
4. Physikalisch-Technische Bundesanstalt, Berlin (Germany). VUV Radiometric Lab.

Fabrication and environmental damage issues may require that the multilayer x-ray reflection coatings used in soft x-ray projection lithography be replaced or repaired. Two repair strategies were investigated. The first was to overcoat defective multilayers with a new multilayer. The feasibility of this approach was demonstrated by depositing high reflectivity (61% at 130 {Angstrom}) molybdenum silicon (Mo/Si) multilayers onto fused silica figured optics that had already been coated with a Mo/Si multilayer. Because some types of damage mechanisms and fabrication errors are not repairable by this method, a second method of repair was investigated. The multilayer was stripped from the optical substrate by etching a release layer which was deposited onto the substrate beneath the multilayer. The release layer consisted of a 1000 {Angstrom} aluminum film deposited by ion beam sputtering or by electron beam evaporation, with a 300 {Angstrom} SiO{sub 2} protective overcoat. The substrates were superpolished zerodur optical flats. The normal incidence x-ray reflectivity of multilayers deposited on these aluminized substrates was degraded, presumably due to the roughness of the aluminum films. Multilayers, and the underlying release layers, have been removed without damaging the substrates.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5921722
• Report Number(s): UCRL-JC-108297; CONF-9107115--67; ON: DE92007339
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
42 ENGINEERING
426000 -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
ALUMINIUM
DEPOSITION
DIMENSIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
FILMS
IONIZING RADIATIONS
LAYERS
METALS
MOLYBDENUM
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
REFLECTIVITY
REPAIR
SEMIMETALS
SILICON
SURFACE COATING
SURFACE PROPERTIES
THICKNESS
TRANSITION ELEMENTS
X RADIATION