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Direct optical excitation of a nitrogen-vacancy (NV) center in nanodiamond bylight via a nanofiber is of interest for all-fiber-integrated quantumapplications. However, the background light induced by the excitation light viathe nanofiber is problematic as it has the same optical wavelength as theemission light from the NV center. In this letter, we propose using a nanofiberBragg cavity to address this problem. We numerically simulate and estimate theelectric field of a nanodiamond induced by excitation light applied from anobjective lens on a confocal microscope system, a nanofiber, and nanofiberBragg-cavities (NFBCs). We estimate that by using a nanofiber, the opticalexcitation intensity can be decreased by roughly a factor of 10 compared tousing an objective lens, while for an NFBC with a grating number of 240 (120for one side) on a nanofiber the optical excitation intensity can besignificantly decreased by roughly a factor of 100. Therefore, it is expectedthat the background light inside a nanofiber can be significantly suppressed.

Direct optical excitation of an NV center via a nanofiber Bragg-cavity: A theoretical simulation