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Diffraction grating couplers milled in Si3N4 rib waveguides with a focused ion beam
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Focused ion beam milling is a processing technology which allows flexible direct writing of nanometer scale features efficiently substituting electron beam lithography. No mask need results in ability for patterns writing even on fragile micromechanical devices. In this work we studied the abilities of the tool for fabrication of diffraction grating couplers in silicon nitride waveguides. The gratings were fabricated on a chip with extra fragile cantilevers of sub micron thickness. Optical characterization of the couplers was done using excitation of the waveguides in visible range by focused Gaussian beams of different waist sizes. Influence of Ga+ implantation on the device performance was studied.
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ZINOVIEV, K., DOMÍNGUEZ, Carlos (domínguez horna), VILÀ I ARBONÈS, Anna maria. Diffraction grating couplers milled in Si3N4 rib waveguides with a focused ion beam. _Optics Express_. 2005. Vol. 13, núm. 21, pàgs. 8618-8624. [consulta: 14 de gener de 2026]. ISSN: 1094-4087. [Disponible a: https://hdl.handle.net/2445/56643]