Femtosecond laser writing of integrated photonic circuits in diamond

Integrated photonic circuits pave the way for next generation technologies quantum information and sensing applications. Femtosecond laser writing has emerged as a valuable technique fabricating such devices when combined with diamond’s properties its nitrogen vacancy color center. Such centers are fundamental applications, being possible to excite them read out optically through fabrication of optical waveguides in bulk diamond. We show how integrate these building blocks diamond, develop proof-of-concept unprecedented electric magnetic field sensitivities.