title: Diamond photonics platform enabled by femtosecond laser writing.
abstract: Diamond is a promising platform for sensing and quantum processing owing to the remarkable properties of the nitrogen-vacancy (NV) impurity. The electrons of the NV center, largely localized at the vacancy site, combine to form a spin triplet, which can be polarized with 532 nm laser light, even at room temperature. The NV's states are isolated from environmental perturbations making their spin coherence comparable to trapped ions. An important breakthrough would be in connecting, using waveguides, multiple diamond NVs together optically. However, still lacking is an efficient photonic fabrication method for diamond akin to the photolithographic methods that have revolutionized silicon photonics. Here, we report the first demonstration of three dimensional buried optical waveguides in diamond, inscribed by focused femtosecond high repetition rate laser pulses. Within the waveguides, high quality NV properties are observed, making them promising for integrated magnetometer or quantum information systems on a diamond chip.
authors.affiliation: Dipartimento di Fisica, Politecnico di Milano, Milano, Italy.
authors.forename: Belén
authors.initials: B
authors.lastname: Sotillo
authors.affiliation: Dipartimento di Fisica, Politecnico di Milano, Milano, Italy.
authors.forename: Vibhav
authors.initials: V
authors.lastname: Bharadwaj
authors.affiliation: Institute for Quantum Science and Technology, University of Calgary, Calgary, Canada.
authors.forename: J P
authors.initials: JP
authors.lastname: Hadden
authors.affiliation: Office of Society-Academia Collaboration for Innovation and Department of Material Chemistry, Kyoto University, Kyoto, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Sakakura
authors.affiliation: Istituto di Fotonica e Nanotecnologie (IFN)-CNR, CSMFO and FBK-CMM, Trento, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Chiappini
authors.affiliation: Dipartimento di Fisica, Politecnico di Milano, Milano, Italy.
authors.forename: Toney Teddy
authors.initials: TT
authors.lastname: Fernandez
authors.affiliation: Dipartimento di Fisica, Politecnico di Milano, Milano, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Longhi
authors.affiliation: IFN-CNR and CNISM Udr Como, Como, Italy.
authors.forename: Ottavia
authors.initials: O
authors.lastname: Jedrkiewicz
authors.affiliation: Office of Society-Academia Collaboration for Innovation and Department of Material Chemistry, Kyoto University, Kyoto, Japan.
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Shimotsuma
authors.affiliation: Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Milano, Italy.
authors.forename: Luigino
authors.initials: L
authors.lastname: Criante
authors.affiliation: IFN - CNR, Milano, Italy.
authors.forename: Roberto
authors.initials: R
authors.lastname: Osellame
authors.affiliation: IFN - CNR, Milano, Italy.
authors.forename: Gianluca
authors.initials: G
authors.lastname: Galzerano
authors.affiliation: Istituto di Fotonica e Nanotecnologie (IFN)-CNR, CSMFO and FBK-CMM, Trento, Italy.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Ferrari
authors.affiliation: Office of Society-Academia Collaboration for Innovation and Department of Material Chemistry, Kyoto University, Kyoto, Japan.
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Miura
authors.affiliation: IFN - CNR, Milano, Italy.
authors.forename: Roberta
authors.initials: R
authors.lastname: Ramponi
authors.affiliation: Institute for Quantum Science and Technology, University of Calgary, Calgary, Canada.
authors.forename: Paul E
authors.initials: PE
authors.lastname: Barclay
authors.affiliation: Dipartimento di Fisica, Politecnico di Milano, Milano, Italy.
authors.forename: Shane Michael
authors.initials: SM
authors.lastname: Eaton