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

Opt Lett

Centre for Quantum Dynamics, Griffith University, Nathan, Queensland 4111, Australia.

Published: April 2011

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 and the highest imaging resolution ever achieved with atoms in free space.

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http://dx.doi.org/10.1364/OL.36.001371DOI Listing

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