Abstract
Diamond is a promising platform for sensing and quantum processing thanks to the remarkable properties of the nitrogen-vacancy (NV) impurity [1]. However, still lacking is an efficient photonic fabrication method for diamond akin to the photolithographic methods that have revolutionized silicon photonics. For the first time, we demonstrate waveguiding in diamond using femtosecond laser writing using a pulse width of 230 fs, 515 nm wavelength, focusing with a 1.25-NA lens and 50 µm below the surface of diamond (type II, optical grade, MB Optics). The inscribed Type II waveguide showed single mode behavior when scanning the input launch fiber transversely. To achieve single mode guiding, we wrote a second type II modification, consisting of two vertically offset lines (Fig. 1(b)). This supported a single mode at 635 nm with a similar transmission as the two-line modification. Fig2c is the PL spectra from the waveguide, both spectra show the first order Raman peak at 573 nm, the ZPL at 637 nm along with its broad phonon sideband from 600 to 800 nm. The spectrum in pristine diamond is the same as that in the waveguide.
© 2016 Japan Society of Applied Physics, Optical Society of America
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