Abstract
Integrated photonic circuits pave the way for next generation technologies for quantum information and sensing applications. Femtosecond laser writing has emerged as a valuable technique for fabricating such devices when combined with diamond’s properties and its nitrogen vacancy color center. Such color centers are fundamental for sensing applications, being possible to excite them and read them out optically through the fabrication of optical waveguides in the bulk of diamond. We show how to integrate these building blocks in diamond, to develop proof-of-concept devices with unprecedented electric and magnetic field sensitivities.
Highlights
Femtosecond laser fabrication has already established itself as a powerful technique for application in the field of material processing for welding, cutting and drilling [1], and it is attracting a growing interest for its capability to directly write microstructures in the bulk of transparent materials [2]
Synthetic diamond is emerging as a convenient platform for the fabrication of three-dimensional photonic structures, for its excellent transparency, hardness and chemical resistance, but because of the existence of vacancy complexes behaving as color centers
We have shown how femtosecond laser writing in diamond can be applied for the fabrication of generation technologies, in particular for quantum optics and information
Summary
Femtosecond laser fabrication has already established itself as a powerful technique for application in the field of material processing for welding, cutting and drilling [1], and it is attracting a growing interest for its capability to directly write microstructures in the bulk of transparent materials [2]. Synthetic diamond is emerging as a convenient platform for the fabrication of three-dimensional photonic structures, for its excellent transparency, hardness and chemical resistance, but because of the existence of vacancy complexes behaving as color centers These quantum emitters can be interfaced with photonic circuits written on the surface or in the bulk of the crystal for quantum sensing or information. The implementation of sensing devices or quantum information systems based on NV- centers and optical WGs in the bulk of diamond requires the ability to fabricate photonic circuits and color centers in a controlled manner Both the formation of NV- centers and optical WGs in diamond can be carried out by the same technique, namely femtosecond laser writing. We will demonstrate in this paper a first proof-of-concept room temperature sensing device, based on an ensemble of color centers and accessible through laser written waveguides in the bulk of diamond, which could allow unprecedented sensitivities for the detection of magnetic and electric fields
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