Wavelength-scale imaging of trapped ions using a phase Fresnel lens |
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Authors: | Jechow A Streed E W Norton B G Petrasiunas M J Kielpinski D |
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Affiliation: | Centre for Quantum Dynamics, Griffith University, Nathan, Queensland 4111, Australia. andreas.jechow@gmx.de |
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Abstract: | 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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