Print Email Facebook Twitter Spatial mode projection for side-wall angle measurements Title Spatial mode projection for side-wall angle measurements Author Cisotto, L. Zhu, Y. Pereira, S.F. Urbach, H.P. Faculty Applied Sciences Department ImPhys/Imaging Physics Date 2015-06-23 Abstract Finding a fast and precise method to measure the side-wall angle of periodic (or non-periodic) structures is still a very challenging problem in lithographic applications. For this reason, over the years, many techniques have been proposed to circumvent this limitation, with the final goal to give the most precise geometrical description of particular targets. Recently, the investigation of the optical angular momentum, which is encoded in the light's spiral spectrum, has brought new ways to acquire information about objects. In this work, we built an optical setup to put forward a new method to detect the side-wall angle in a fast and reliable way. The novelty of this work is the use of the spiral spectrum of a light beam for angle measurements, i.e. the light transmitted by a particular structure is projected onto properly tailored spatial modes and only the most sensitive mode to the side wall angle is detected and processed. Subject side-wall angleorbital angular momentummode expansionspiral spectrum To reference this document use: http://resolver.tudelft.nl/uuid:22b7dde3-c97c-4168-b804-6aae3a81ecfe Publisher SPIE ISBN 978-162841686-2 Source https://doi.org/10.1117/12.2184738 Source Modeling Aspects in Optical Metrology V: Proceedings of SPIE- International Society for Optical Engineering; 9526 Part of collection Institutional Repository Document type conference paper Rights © 2015 SPIE Files PDF 322031.pdf 503.35 KB Close viewer /islandora/object/uuid:22b7dde3-c97c-4168-b804-6aae3a81ecfe/datastream/OBJ/view