Diamond nonlinear photonics

High quality-factor optical nanocavities in bulk single-crystal diamond

“…From measured Q-factors, an upper limit on the diamond waveguide transmission loss (a) is estimated to be B1.5 dB cm À 1 for both guided modes via the relationship 25 : a % 2pn g Q i l = , where n g is the mode group index and l is the resonant wavelength. While this loss value is roughly five times greater than that recently reported for single-crystal diamond waveguides fabricated via the membrane-thinning approach 18 , it is also an order of magnitude smaller than losses of polycrystalline diamond ring resonators 26 .…”

“…We emphasize that monolithic single-crystal diamond nanophotonic structures are ultimately compatible with postprocessing techniques needed to stabilize implantation-defined colour centres, which often include high-temperature (B1,200°C) annealing 41 . Moreover, high-Q optical nanocavities in diamond are an attractive nonlinear optics platform 18 and would combine the advantage of relatively large Kerr nonlinearity and large Raman gain, lack of two-or multiphoton absorption, and excellent thermal properties for the generation of on-chip high repetition rate frequency combs 18,42 and Raman lasers at exotic wavelenths 43,44 .…”

“…For the most part, these efforts have involved heterogeneous integration of single-crystal diamond slabs (B5-to 30-mm thick) on supporting silica substrates, with subsequent oxygen plasma etching to thin the slab near a target thickness B500-nm or less. Ring resonators [12][13][14][15] and photonic crystal cavities 16,17 have been realized in such thinned diamond membranes, with recent results 18 demonstrating ultrahigh-quality factors (Q) in excess of 10 6 . While this approach remains promising 19 , complications due to material handling, scalability, repeatability and sheer difficulty of removing tens of microns of diamond while preserving uniform hundred-nanometre scale films limit this approach significantly.…”

Diamond Nanophotonic Circuits Functionalized by Dip‐pen Nanolithography

“…We simultaneously functionalize several microring and microdisc resonators with different dies and high precision, allowing us to route fluorescent emission with photonic waveguides to arbitrary locations on chip. Our approach holds promise for hybrid optical systems and nanoscale bioactive devices for robust biomedical and environmental high-throughput sensing applications.2 Photonic components made from diamond have emerged as a promising platform for applications in quantum optics [1][2][3][4], non-linear optics [5,6] and optomechanics [7,8].Because of its remarkable material properties such as broadband optical transparency, high mechanical stability and hardness, high thermal conductivity, and good chemical stability, diamond is used for a wealth of applications in research and industrial environments. In particular the combination of appealing optical properties and biocompatibility make diamond an attractive platform for biophotonic applications [9][10][11].…”

“…2 Photonic components made from diamond have emerged as a promising platform for applications in quantum optics [1][2][3][4], non-linear optics [5,6] and optomechanics [7,8].…”