### Session V12: Focus Session: Magneto-optics and Spin Dynamics

11:15 AM–2:15 PM, Thursday, March 8, 2007
Colorado Convention Center Room: Korbel 3C

Chair: Scott Crooker, Los Alamos National Laboratory

Abstract ID: BAPS.2007.MAR.V12.10

### Abstract: V12.00010 : Development of an 8-12 GHz variable frequency microwave resonant cavity for optically-detected magnetic resonance (ODMR) of GaAs-related semiconductors

1:27 PM–1:39 PM

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#### Authors:

J.S. Colton
L.R. Wienkes
L.R. Oestreich
P.M. Schroeder
(University of Wisconsin-La Crosse)

In order to do spin echo measurements of the T2 spin coherence time in GaAs and related materials, one must have a resonant microwave cavity; the resonance serves mainly to increase the strength of the magnetic field at the sample. In order to probe materials with g-factors as low as $\vert$g$\vert$ = 0.1 (such as quantum-confined GaAs samples, and bulk/quantum-confined AlGaAs alloys) in moderate magnetic fields ($<$ 7 T), we have selected a resonant frequency of around 10 GHz for the resonator design. In order to fit a 10 GHz cavity into moderately-sized ($<$ 1 inch) magnet bore, however, a high dielectric material must be used, a so-called dielectric resonator''. We will present the design and testing of such a resonant cavity (resonant mode: TE011), that additionally allows for optical access of the sample, as well as a highly-variable resonant frequency.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.V12.10