The development of specialized non-destructive methods for monitoring of microstructured optical elements is necessary for introduction of diffractive, micro-optical and conformal optical elements into production. However, a wide variety of such elements, as well as their production technologies, set many tasks in the implementation of process control both at the final and at the intermediate stages of the formation of a multilevel and binary phase element. All this requires the use of various expensive equipment, each of which individually does not allow solving the whole range of tasks. Multichannel scanning measuring system that implementing spectroscopic and diffraction testing methods was developed at IAE SB RAS. The device includes four measuring channels allowing to measure the following parameters and characteristics: transmission function of half-tone masks in zeroth order or as sum of all diffraction orders; thickness of transparent films covered on substrate (by the spectroscopic method in reflection); measurement of the zero-order intensity of diffraction structures, both in transmission and in reflection in range of wavelengths from 200 nm to 1100 nm; measurement of the diffraction efficiency of the first and zero orders of diffraction in reflected light (including for structures made in optically transparent materials) for monitoring the parameters of the formed relief of multilevel elements.

Date Published: 23 April 2019
PDF: 12 pages
Proc. SPIE 11030, Holography: Advances and Modern Trends VI, 110301E (23 April 2019); doi: 10.1117/12.2521140

Published in SPIE Proceedings Vol. 11030:
Holography: Advances and Modern Trends VI
Antonio Fimia; Miroslav Hrabovský; John T. Sheridan, Editor(s)