Diffraction grating parameter retrieval using non-paraxial structured beams in coherent Fourier scatterometry

S. Soman*, S. F. Pereira, O. El Gawhary

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

In recent years, a lot of works have been published that use parameter retrieval using orbital angular momentum (OAM) beams. Most make use of the OAM of different Laguerre-Gauss modes. However, those specific optical beams are paraxial beams and this limits the regime in which they can be used. In this paper, we report on the first results on retrieving the geometric parameters of a diffraction grating by analysing the corresponding complex-valued (i.e. amplitude and phase) Helmholtz Natural Modes (HNM) spectra containing both the azimuthal (i.e. n) and radial (i.e. m) indices. HNMs are a set of orthogonal, non-paraxial beams with finite energy carrying OAM. We use the coherent Fourier scatterometry (CFS) setup to calculate the field scattered from the diffraction grating. The amplitude and phase contributions of each HNM are then obtained by numerically calculating the overlap integral of the scattered field with the different modes. We show results on the sensitivity of the HNMs to several grating parameters.

Original languageEnglish
Article number034006
Number of pages10
JournalJournal of Optics (United Kingdom)
Volume24
Issue number3
DOIs
Publication statusPublished - 2022

Keywords

  • coherent Fourier scatterometry
  • optical metrology
  • scatterometry
  • structured beam

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