Development of Grating for the Optical Addressing of Sr+ Ions With Data Analysis Techniques

In this study, SiN-based gratings with various radius of curvature (
r
) are designed and fabricated for the optical addressing of trapped Sr
⁺
ion. The beam width of the light coupled out from the gratings is investigated using a self-developed Python-based data analysis technique. It is found that the
r
values have insignificant influence on the beam width along
x
-axis; whereas the beam waist along
y
-axis reduces from 13.96 to 12.3 μm as
r
increases from 15 to 20 μm, then increases gradually to 20.51 μm as the
r
value further increases to 60 μm. The obtained results can provide a versatile solution on the optical addressing of trapped Sr
⁺
for applications in quantum engineering.