At-wavelength inspection of sub-40 nm defects in extreme ultraviolet lithography mask blank by photoemission electron microscopy
Optics Letters, ISSN: 0146-9592, Vol: 32, Issue: 13, Page: 1875-1877
2007
- 8Citations
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Article Description
Anew at-wavelength inspection technology to probe nanoscale defects buried underneath Mo/Si multilayers on an extreme ultraviolet (EUV) lithography mask blank has been implemented using EUV photoemission electron microscopy (EUV-PEEM). EUV-PEEM images of programmed defect structures of various lateral and vertical sizes recorded at an ∼13.5 nm wavelength show that 35 nm wide and 4 nm high buried line defects are clearly detectable. The imaging technique proves to be sensitive to small phase jumps, enhancing the edge visibility of the phase defects, which is explained in terms of a standing wave enhanced image contrast at resonant EUV illumination. © 2007 Optical Society of America.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=39749165812&origin=inward; http://dx.doi.org/10.1364/ol.32.001875; http://www.ncbi.nlm.nih.gov/pubmed/17603599; https://opg.optica.org/abstract.cfm?URI=ol-32-13-1875; https://www.osapublishing.org/abstract.cfm?URI=ol-32-13-1875; https://www.osapublishing.org/viewmedia.cfm?URI=ol-32-13-1875&seq=0; https://dx.doi.org/10.1364/ol.32.001875; https://www.osapublishing.org/ol/abstract.cfm?uri=ol-32-13-1875
Optica Publishing Group
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