Yeung, T. K.Le Sage, DavidPham, LinhStanwix, P. L.Walsworth, Ronald2014-03-102012Yeung, T. K., D. Le Sage, L. M. Pham, P. L. Stanwix, and R. L. Walsworth. 2012. Anti-Reflection Coating for Nitrogen-Vacancy Optical Measurements in Diamond. Applied Physics Letters 100, no. 25: 251111.0003-6951http://nrs.harvard.edu/urn-3:HUL.InstRepos:11878775We realize anti-reflection (AR) coatings for optical excitation and fluorescence measurements of nitrogen-vacancy (NV) color centers in bulk diamond by depositing quarter-wavelength thick silica layers on the diamondsurface. These AR coatings improve NV-diamond optical measurements by reducing optical reflection at the diamond-air interface from ≈17% to ≈2%, which allows more effective NV optical excitation and more efficient detection of NV fluorescence. We also show that diamondAR coatings eliminate standing-wave interference patterns of excitation laser intensity within bulk diamond, and thereby greatly reduce spatial variations in NV fluorescence, which can degrade spatially resolved magnetic field sensing using NV centers.en-USJournal Article2014-03-1010.1063/1.4730401