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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Franco Gori
  • Vol. 29, Iss. 1 — Jan. 1, 2012
  • pp: 117–123

Self-consistent optical constants of sputter-deposited B 4 C thin films

Juan I. Larruquert, Antonio P. Pérez-Marín, Sergio García-Cortés, Luis Rodríguez-de Marcos, José A. Aznárez, and José A. Méndez  »View Author Affiliations

JOSA A, Vol. 29, Issue 1, pp. 117-123 (2012)

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The optical constants of ion-beam-sputtered B 4 C films have been measured by ellipsometry in the 190 950 nm range. The set of data has been extended toward both shorter and longer wavelengths with data in the literature, along with interpolations and extrapolations, in order to obtain a self-consistent set of data by means of Kramers–Krönig analysis. All data correspond to films that were deposited by sputtering on nonheated substrates, and hence they are expected to be amorphous. The B 4 C bandgap was calculated as a fitting parameter of Tauc equations for indirect transitions using the present optical constants. Good global accuracy of the data was estimated through the use of various sum rules. The consistent data set includes the visible to the extreme UV (EUV); this large spectrum of characterization will enable the design of multilayer coatings that combine a relatively high reflectance in parts of the EUV with a desired performance at a secondary range, such as the visible.

© 2012 Optical Society of America

OCIS Codes
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(160.6000) Materials : Semiconductor materials
(230.4170) Optical devices : Multilayers
(260.7200) Physical optics : Ultraviolet, extreme
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: October 4, 2011
Manuscript Accepted: October 21, 2011
Published: December 22, 2011

Juan I. Larruquert, Antonio P. Pérez-Marín, Sergio García-Cortés, Luis Rodríguez-de Marcos, José A. Aznárez, and José A. Méndez, "Self-consistent optical constants of sputter-deposited B4C thin films," J. Opt. Soc. Am. A 29, 117-123 (2012)

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