Widefield microwave imaging in alkali vapor cells with sub-100 mum resolution

Horsley, Andrew and Du, Guan-Xiang and Treutlein, Philipp. (2015) Widefield microwave imaging in alkali vapor cells with sub-100 mum resolution. New journal of physics, 17. p. 112002.

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Official URL: http://edoc.unibas.ch/40484/

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We report on widefield microwave vector field imaging with sub-100 mu m resolution using a microfabricated alkali vapor cell. The setup can additionally image dc magnetic fields, and can be configured to image microwave electric fields. Our camera-based widefield imaging system records 2D images with a 6 x 6 mm(2) field of view at a rate of 10 Hz. It provides up to 50 mu m spatial resolution, and allows imaging of fields as close as 150 mu m above structures, through the use of thin external cell walls. This is crucial in allowing us to take practical advantage of the high spatial resolution, as feature sizes in near-fields are on the order of the distance from their source, and represent an order of magnitude improvement in surface-feature resolution compared to previous vapor cell experiments. We present microwave and dc magnetic field images above a selection of devices, demonstrating a microwave sensitivity of 1.4 mu T Hz(-1/2) per 50 x 50 x 140 mu m(3) voxel, at present limited by the speed of our camera system. Since we image 120 x 120 voxels in parallel, a single scanned sensor would require a sensitivity of at least 12 nT Hz(-1/2) to produce images with the same sensitivity. Our technique could prove transformative in the design, characterization, and debugging of microwave devices, as there are currently no satisfactory established microwave imaging techniques. Moreover, it could find applications in medical imaging.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentelle Nanophysik (Treutlein)
UniBasel Contributors:Treutlein, Philipp and Horsley, Andrew and Du, Guanxiang
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:IOP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
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edoc DOI:
Last Modified:05 Apr 2018 08:41
Deposited On:09 May 2016 13:05

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