Share Email Print
cover

Proceedings Paper

Digital holography system for topography measurement
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

The optical characteristics of Diffractive Optical Elements are determined by the properties of the photosensitive film on which they are produced. When working with photoresist plates, the most important property is the change in the plate's topography for different exposures. In this case, the required characterization involves a topographic measurement that can be made using digital holography. This work presents a digital holography system in which a hologram's phase map is obtained from a single recorded image. The phase map is calculated by applying a phase-shifting algorithm to a set of images that are created using a digital phase-shifting/tilteliminating procedure. Also, the curvatures, introduced by the imaging elements used in the experimental setup, are digitally compensated for using a polynomial fitting-method. The object's topography is then obtained from this modified phase map. To demonstrate the proposed procedure, the topography of patches exposed on a Shipley 1818 photoresist plate by microlithography equipment-which is currently under construction-is shown.

Paper Details

Date Published: 2 November 2011
PDF: 6 pages
Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80117T (2 November 2011); doi: 10.1117/12.903311
Show Author Affiliations
R. Amezquita, Univ. Nacional de Colombia Sede Bogotá (Colombia)
Combustion Ingenieros LTDA (Colombia)
O. J. Rincon, Combustion Ingenieros LTDA (Colombia)
Y. M. Torres, Combustion Ingenieros LTDA (Colombia)
S. Amezquita, Univ. Nacional de Colombia Sede Bogotá (Colombia)
Combustion Ingenieros LTDA (Colombia)


Published in SPIE Proceedings Vol. 8011:
22nd Congress of the International Commission for Optics: Light for the Development of the World
Ramón Rodríguez-Vera; Ramón Rodríguez-Vera; Ramón Rodríguez-Vera; Rufino Díaz-Uribe; Rufino Díaz-Uribe; Rufino Díaz-Uribe, Editor(s)

© SPIE. Terms of Use
Back to Top