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Title: Nanometer resolution optical coherence tomography using broad bandwidth XUV and soft x-ray radiation

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep20658· OSTI ID:1240088
 [1];  [2];  [3];  [3];  [1];  [3];  [4];  [4];  [5];  [6];  [1];  [1]
  1. Friedrich-Schiller-Univ. Jena, Jena (Germany); Helmholtz-Institute Jena, Jena (Germany)
  2. Friedrich-Schiller-Univ. Jena, Jena (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Friedrich-Schiller-Univ. Jena, Jena (Germany)
  4. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  5. National Research Council of Canada, Ottawa, ON (Canada); Ben-Gurion Univ., Beer-Sheva (Israel)
  6. National Research Council of Canada, Ottawa, ON (Canada)

Optical coherence tomography (OCT) is a non-invasive technique for cross-sectional imaging. It is particularly advantageous for applications where conventional microscopy is not able to image deeper layers of samples in a reasonable time, e.g. in fast moving, deeper lying structures. However, at infrared and optical wavelengths, which are commonly used, the axial resolution of OCT is limited to about 1 μm, even if the bandwidth of the light covers a wide spectral range. Here, we present extreme ultraviolet coherence tomography (XCT) and thus introduce a new technique for non-invasive cross-sectional imaging of nanometer structures. XCT exploits the nanometerscale coherence lengths corresponding to the spectral transmission windows of, e.g., silicon samples. The axial resolution of coherence tomography is thus improved from micrometers to a few nanometers. Tomographic imaging with an axial resolution better than 18 nm is demonstrated for layer-type nanostructures buried in a silicon substrate. Using wavelengths in the water transmission window, nanometer-scale layers of platinum are retrieved with a resolution better than 8 nm. As a result, XCT as a nondestructive method for sub-surface tomographic imaging holds promise for several applications in semiconductor metrology and imaging in the water window.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC03-76SF00515
OSTI ID:
1240088
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (9)

Potential applications and human biosafety of nanomaterials used in nanomedicine: Potential applications and human biosafety of nanomaterials journal June 2017
Optical coherence tomography (OCT) with 2 nm axial resolution using a compact laser plasma soft X-ray source journal May 2018
A high resolution extreme ultraviolet spectrometer system optimized for harmonic spectroscopy and XUV beam analysis journal February 2019
Laboratory setup for extreme ultraviolet coherence tomography driven by a high-harmonic source journal November 2019
Optical sectioning in induced coherence tomography with frequency-entangled photons journal February 2018
Spectroscopic imaging with spectral domain visible light optical coherence microscopy in Alzheimer’s disease brain samples journal January 2017
Experimental demonstration of full-field quantum optical coherence tomography journal December 2019
A high resolution extreme ultraviolet spectrometer system optimized for harmonic spectroscopy and XUV beam analysis text January 2019
Optical sectioning in induced coherence tomography with frequency-entangled photons text January 2017

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