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Astronomy (communication Arising)

Black holes, fleas and microlithography


Fresnel lenses allow almost perfect imaging in widely different circumstances, but their focus is perfect only for a single wavelength. Wang et al.1 have shown how the effective bandpass may be widened for X-ray microscopy by using a compound diffractive/refractive lens near to an absorption edge. A compound lens has also been proposed for high-energy astronomy, working well above all absorption edges2,3. Although the scale is very different, we point out here that the principle is the same. Ever since Galileo constructed an astronomical telescope that he was able to reconfigure to study fleas and gnats, astronomy and microscopy have relied on optics that are closely related, but different in detail.

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Figure 1: An achromatic refractive/diffractive lens.


  1. Wang, Y., Yun, W. & Jacobsen, C. Nature 424, 50–53 (2003).

    ADS  CAS  Article  Google Scholar 

  2. Skinner, G. K. Astron. Astrophys. 375, 691–700 (2001).

    ADS  Article  Google Scholar 

  3. Skinner, G. K. Astron. Astrophys. 383, 352–359 (2002).

    ADS  Article  Google Scholar 

  4. Gil, D., Menon, R. & Smith, H. I. J. Vac. Sci. Tech. B (in the press).

  5. Jerius, D. et al. Proc. SPIE 4012, 17–27 (2000).

    ADS  Article  Google Scholar 

  6. Gorenstein, P. Proc. SPIE 4851, 599–606 (2003).

    ADS  Article  Google Scholar 

  7. NASA Structure and Evolution of the Universe Subcommittee. Beyond Einstein: From the Big Bang to Black Holes (NASA, 2003).

  8. White, N. Nature 407, 146–147 (2000).

    ADS  CAS  Article  Google Scholar 

  9. Cash, W. Proc. SPIE 4852, 196–209 (2003).

    ADS  Article  Google Scholar 

Download references

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Correspondence to Gerry Skinner.

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Skinner, G., Gorenstein, P. Black holes, fleas and microlithography. Nature 426, 245–246 (2003).

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