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    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.


    Nurperi Yavuz, Mustafa Mert Bayer, Hüseyin Ozan Ҫirkinoğlu, Ali Serpengüzel, Thien Le Phu, Argyro Giakoumaki, Vibhav Bharadwaj, Roberta Ramponi, Shane M Eaton. Laser-Inscribed Diamond Waveguide Resonantly Coupled to Diamond Microsphere. Molecules (Basel, Switzerland). 2020 Jun 10;25(11)

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    PMID: 32532112

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