Femtosecond laser inscription of Bragg grating waveguides in bulk diamond
V. Bharadwaj, A. Courvoisier, T. T. Fernandez, R. Ramponi, G., Galzerano, J. Nunn, M. J. Booth, R. Osellame, S. M. Eaton, P. S. Salter
TL;DR
This paper demonstrates femtosecond laser inscription of Bragg grating waveguides in bulk diamond, enabling integrated photonic devices with reflection capabilities for telecommunications.
Contribution
It introduces a novel femtosecond laser fabrication method for creating Bragg gratings in diamond, advancing 3D photonic integration in this material.
Findings
Successful fabrication of Bragg grating waveguides in diamond
Operation in the telecommunications wavelength band
Potential for complex 3D photonic networks in diamond
Abstract
Femtosecond laser writing is applied to form Bragg grating waveguides in the diamond bulk. Type II waveguides are integrated with a single pulse point-by-point periodic laser modification positioned towards the edge of the waveguide core. These photonic devices, operating in the telecommunications band, allow for simultaneous optical waveguiding and narrowband reflection from a 4th order grating. This fabrication technology opens the way towards advanced 3D photonic networks in diamond for a range of applications.
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