.Diamond-based photonic devices offer exceptional opportunity to study cavity QED at room temperature. Here we report fabrication and optical characterization of high quality photonic

As an important photoluminescence (PL) phenomenon, room temperature phosphorescence (RTP) has received widespread interests since it has the benefit of longer luminescence lifetime, larger Stokes shift and higher environmental sensitivity....

Nanocrystalline diamond microdisks have been fabricated and characterized. The process conditions were chosen to ensure smooth and vertical sidewalls. Focused ion beam milling was used to create ultrasmooth sidewalls. Whispering gallery modes were observed near the nitrogen-vacancy center emission wavelength (637nm) by photoluminescence and near ∼1550nm by evanescent fiber coupling. The cavity quality factors (Q) are about 100 in both experiments. The Q’s for these disks were calculated to be as high as 105 by three-dimensional finite-difference time-domain simulations. The authors believe the Q’s to be limited by absorption and scattering within the nanocrystalline cavity material.

Suspended single crystal diamond devices, microdisks and beam structures, have been fabricated. Low energy boron ions (180keV) were implanted to create subsurface damage while maintaining an undamaged top surface; homoepitaxial growth was subsequently carried out on the material. The damaged layer was selectively removed by electrochemical etching. Electrodes were deposited adjacent to the devices to reduce the voltage required for etching and to help control the etch profile.

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