Precision alignment of integrated optics in hybrid microsystems.

Area of Science:

• Quantum Information Science
• Micro-optics and Photonics
• Surface Electrode Ion Traps

Background:

• Scalable quantum information processing relies on efficient integration of optical components with ion traps.
• Precise alignment of micro-optics is critical for controlling and collecting signals from trapped ions.
• Existing alignment methods often lack the required precision for advanced hybrid microsystems.

Purpose of the Study:

• To develop a submicrometer precision alignment technique for integrating micro-optics with surface electrode ion traps.
• To enable scalable quantum information processing through advanced DOE integration.
• To provide a quantifiable method for assessing alignment accuracy in hybrid microsystems.

Main Methods:

• Utilized off-axis linear Fresnel zone plates (FZPs) for high-precision alignment.
• Fabricated four pairs of FZPs on an optics chip containing a high numerical aperture microlens (a diffractive optical element - DOE).
• Integrated alignment rulers etched into the ion trap's metal layer for misalignment quantification.

Main Results:

• Achieved submicrometer precision in integrating micro-optics with surface electrode ion traps.
• Demonstrated alignment capabilities across six translational and rotational degrees of freedom using FZP pairs.
• Enabled precise quantification of misalignment through integrated alignment rulers.

Conclusions:

• The developed FZP-based alignment method significantly advances the integration of diffractive optical elements (DOEs) with surface electrode ion traps.
• This precise integration is a key enabler for the scalability of quantum information processing.
• The approach is applicable to a wide range of hybrid microsystems requiring high-precision optical alignment.