Laser-Inscribed Diamond Waveguide Resonantly Coupled to Diamond Microsphere

Abstract

An all-diamond photonic circuit was implemented by integrating a diamond microsphere with a femtosecond-laser-written bulk diamond waveguide. The near surface waveguide was fabricated by exploiting the Type II fabrication method to achieve stress-induced waveguiding. Transverse electrically and transverse magnetically polarized light from a tunable laser operating in the near-infrared region was injected into the diamond waveguide, which when coupled to the diamond microsphere showed whispering-gallery modes with a spacing of 0.33 nm and high-quality factors of 105. By carefully engineering these high-quality factor resonances, and further exploiting the properties of existing nitrogen-vacancy centers in diamond microspheres and diamond waveguides in such configurations, it should be possible to realize filtering, sensing and nonlinear optical applications in integrated diamond photonics.

References in corpus (4)

• Optical frequency comb generation from a monolithic microresonator
• Characterization of high finesse mirrors: loss, phase shifts and mode structure in an optical cavity
• Integrated waveguides and deterministically positioned nitrogen vacancy centers in diamond created by femtosecond laser writing
• Polarized micro-Raman studies of femtosecond laser written stress-induced optical waveguides in diamond