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Title: Binary pseudo-random patterned structures for modulation transfer function calibration and resolution characterization of a full-field transmission soft x-ray microscope

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/1.4936752· OSTI ID:1410324
 [1];  [2];  [1];  [3]; ORCiD logo [4]; ORCiD logo [5];  [6];  [1];  [7];  [1];  [7];  [7]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Diablo Valley College, Pleasant Hill, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. KLA-Tencor Corp., Milpitas, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Biological, Environmental & Climate Sciences Dept.
  7. aBeam Technologies, Inc., Hayward, CA (United States)

We present a modulation transfer function (MTF) calibration method based on binary pseudo-random (BPR) one-dimensional sequences and two-dimensional arrays as an effective method for spectral characterization in the spatial frequency domain of a broad variety of metrology instrumentation, including interferometric microscopes, scatterometers, phase shifting Fizeau interferometers, scanning and transmission electron microscopes, and at this time, x-ray microscopes. The inherent power spectral density of BPR gratings and arrays, which has a deterministic white-noise-like character, allows a direct determination of the MTF with a uniform sensitivity over the entire spatial frequency range and field of view of an instrument. We demonstrate the MTF calibration and resolution characterization over the full field of a transmission soft x-ray microscope using a BPR multilayer (ML) test sample with 2.8 nm fundamental layer thickness. We show that beyond providing a direct measurement of the microscope's MTF, tests with the BPRML sample can be used to fine tune the instrument's focal distance. Finally, our results confirm the universality of the method that makes it applicable to a large variety of metrology instrumentation with spatial wavelength bandwidths from a few nanometers to hundreds of millimeters.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1410324
Journal Information:
Review of Scientific Instruments, Vol. 86, Issue 12; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (2)

Modeling surface topography of state-of-the-art x-ray mirrors as a result of stochastic polishing process: recent developments conference September 2016
Development of a high performance surface slope measuring system for two-dimensional mapping of x-ray optics conference September 2017

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