title: Grating-assisted coupling to nanophotonic circuits in microcrystalline diamond thin films.
abstract: Synthetic diamond films can be prepared on a waferscale by using chemical vapour deposition (CVD) on suitable substrates such as silicon or silicon dioxide. While such films find a wealth of applications in thermal management, in X-ray and terahertz window design, and in gyrotron tubes and microwave transmission lines, their use for nanoscale optical components remains largely unexplored. Here we demonstrate that CVD diamond provides a high-quality template for realizing nanophotonic integrated optical circuits. Using efficient grating coupling devices prepared from partially etched diamond thin films, we investigate millimetre-sized optical circuits and achieve single-mode waveguiding at telecoms wavelengths. Our results pave the way towards broadband optical applications for sensing in harsh environments and visible photonic devices.
authors.affiliation: Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Patrik
authors.initials: P
authors.lastname: Rath
authors.forename: Svetlana
authors.initials: S
authors.lastname: Khasminskaya
authors.forename: Christoph
authors.initials: C
authors.lastname: Nebel
authors.forename: Christoph
authors.initials: C
authors.lastname: Wild
authors.forename: Wolfram Hp
authors.initials: WH
authors.lastname: Pernice
keywords: diamond devices; integrated optics; nanophotonics; waveguiding circuits