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Diamond waveguides: toward an all-diamond platform

Diamond has a range of extraordinary properties and the recent ability to produce high quality synthetic diamond has paved the way for the fabrication of practical diamond devices. This paper details the recent progress in the fabrication of waveguide structures in diamond which are desirable as the basis for quantum key distribution (QKD), quantum computing and high-power, high speed microwave chips. The diamond ridge waveguide structures are produced by photolithography and reactive ion etching (RIE) with some additional processing with a focused ion beam (FIB). The processes currently used are discussed along with experimental results. Future fabrication goals and potential methods for achieving these goals are also presented.