Development of Grating for the Optical Addressing of Sr<sup>+</sup> Ions With Data Analysis Techniques
Yu Dian Lim, Peng Zhao, L. Guidoni, J.-P. Likforman, Chuan Seng Tan
Abstract
In this study, SiN-based gratings with various radius of curvature ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</i> ) are designed and fabricated for the optical addressing of trapped Sr <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> 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 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</i> values have insignificant influence on the beam width along <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</i> -axis; whereas the beam waist along <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">y</i> -axis reduces from 13.96 to 12.3 μm as <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</i> increases from 15 to 20 μm, then increases gradually to 20.51 μm as the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</i> value further increases to 60 μm. The obtained results can provide a versatile solution on the optical addressing of trapped Sr <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> for applications in quantum engineering.