title: Wavelength-scale imaging of trapped ions using a phase Fresnel lens.
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.
authors.affiliation: Centre for Quantum Dynamics, Griffith University, Nathan, Queensland 4111, Australia. andreas.jechow@gmx.de
authors.forename: A
authors.initials: A
authors.lastname: Jechow
authors.forename: E W
authors.initials: EW
authors.lastname: Streed
authors.forename: B G
authors.initials: BG
authors.lastname: Norton
authors.forename: M J
authors.initials: MJ
authors.lastname: Petrasiunas
authors.forename: D
authors.initials: D
authors.lastname: Kielpinski