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Author: ravikiran attota

Displaying records 21 to 30 of 40 records.
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21. Nanoscale Measurements with a Through-Focus Scanning-Optical-Microscope
Published: 7/15/2009
Authors: Ravikiran Attota, Richard M Silver, Thomas Avery Germer
Abstract: We present a novel optical technique that produces nanometer dimensional measurement sensitivity using a conventional optical microscope, by analyzing through-focus scanning-optical-microscope (TSOM) images obtained at different focus positions. In ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902707

22. Through-focus Scanning and Scatterfield Optical Methods for Advanced Overlay Target Analysis
Published: 9/1/2008
Authors: Ravikiran Attota, Michael T. Stocker, Richard M Silver, Nathanael A Heckert, Hui H. Zhou, Richard J Kasica, Lei Chen, Ronald G Dixson, Ndubuisi George Orji, Bryan M Barnes, Peter Lipscomb
Abstract: In this paper we present overlay measurement techniques that use small overlay targets for advanced semiconductor applications. We employ two different optical methods to measure overlay using modified conventional optical microscope platforms. They ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902294

23. Through-focus scanning optical microscope imaging method for nano-scale dimensional analysis
Published: 9/1/2008
Authors: Ravikiran Attota, Richard M Silver
Abstract: We present a novel optical technique that produces nanometer dimensional measurement sensitivity using a conventional bright-field optical microscope, by analyzing two-dimensional through-focus scanning optical microscope (TSOM) images constructed us ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=824668

24. Optical Through-Focus Technique that Differentiates Small Changes in Line Width, Line Height and Sidewall Angle for CD, Overlay, and Defect Metrology Applications
Published: 4/16/2008
Authors: Ravikiran Attota, Richard M Silver, Bryan M Barnes
Abstract: We present a new optical technique for dimensional analysis of sub 100 nm sized targets by analyzing through-focus images obtained using a conventional bright-field optical microscope.  We present a method to create through-focus image maps (TFIM) us ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=824634

25. Optical Critical Dimension Measurement of Silicon Grating Targets Using Back Focal Plane Scatterfield Microscopy
Published: 1/2/2008
Authors: Heather J Patrick, Ravikiran Attota, Bryan M Barnes, Thomas Avery Germer, Michael T. Stocker, Richard M Silver, Michael R Bishop
Abstract: We demonstrate optical critical dimension measurement of lines in silicon grating targets using back focal plane scatterfield microscopy. In this technique, angle-resolved diffraction signatures are obtained from grating targets by imaging the back ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841060

26. Line Width Measurement Technique Using Through-Focus Optical Images
Published: 1/1/2008
Authors: Ravikiran Attota, Richard M Silver, Ronald G Dixson
Abstract: We present a detailed experimental study of a new through-focus technique to measure line width (CD) with nanometer sensitivity using a bright field optical microscope. This method relies on analyzing intensity gradients in optical images at differen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823239

27. Extending the Limits of Image-Based Optical Metrology
Published: 6/20/2007
Authors: Richard M Silver, Bryan M Barnes, Ravikiran Attota, Jay Shi Jun, Michael T. Stocker, Egon Marx, Heather J Patrick
Abstract: We have developed a set of techniques, referred to as scatterfield microscopy, in which the illumination is engineered in combination with appropriately designed metrology targets. Previously we reported results from samples with sub-50 nm sized fea ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823218

28. Model-Based Analysis of the Limits of Optical Metrology With Experimental Comparisons
Published: 6/18/2007
Authors: Richard M Silver, Ravikiran Attota, Egon Marx
Abstract: This paper presents a summary and analysis of a study on optical modeling for critical dimension metrology. The paper is focused on two primary elements: 1) the comparison, stability, and validity of multiple electromagnetic scattering models and 2) ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823233

29. Calibrated Overlay Wafer Standard
Series: Special Publication (NIST SP)
Report Number: 260-165
Published: 1/1/2007
Authors: Michael T. Stocker, Richard M Silver, Ravikiran Attota, Jay Shi Jun
Abstract: This document describes the physical characteristics of Standard Reference Material SRM 5000, provides guidance for its use in calibrating overlay (OL) tools, and gives information and precautions concerning its care and handling.Standard Reference M ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823210

30. Fundamental Limits of Optical Critical Dimension Metrology: A Simulation Study
Published: 1/1/2007
Authors: Richard M Silver, Thomas Avery Germer, Ravikiran Attota, Bryan M Barnes, B Bunday, J Allgair, Egon Marx, Jay Shi Jun
Abstract: This paper is a comprehensive summary and analysis of a SEMATECH funded project to study the limits of optical critical dimension scatterometry.  The project was focused on two primary elements: 1) the comparison, stability, and validity of indu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823227



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