Wavelength-scale imaging of trapped ions using a phase Fresnel lens.

@article{Jechow2011WavelengthscaleIO,
  title={Wavelength-scale imaging of trapped ions using a phase Fresnel lens.},
  author={Andreas Jechow and Erik W. Streed and Benjamin G. Norton and Matthew Joseph Paul Petrasiunas and David Kielpinski},
  journal={Optics letters},
  year={2011},
  volume={36 8},
  pages={
          1371-3
        }
}
A microfabricated phase Fresnel lens was used to image ytterbium ions trapped in a radio frequency Paul trap. The ions were laser cooled close to the Doppler limit on the 369.5 nm transition, reducing the ion motion so that each ion formed a near point source. By detecting the ion fluorescence on the same transition, near-diffraction-limited imaging with spot sizes of below 440 nm (FWHM) was achieved. To our knowledge, this is the first demonstration of wavelength-scale imaging of trapped ions… 

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