A compact holographic optical tweezers instrument

Area of Science:

• Physics
• Optical Engineering
• Microscopy

Background:

• Holographic optical tweezers (HOT) are crucial for 3D micro-structure assembly and precision measurements.
• Existing HOT systems can be bulky and complex, limiting their accessibility and collaborative use.

Purpose of the Study:

• To develop a compact, stable, and user-friendly holographic optical tweezers instrument.
• To enhance compatibility with diverse microscopy techniques for broader research applications.
• To facilitate collaborative research through an accessible and portable system.

Main Methods:

• Designed a custom inverted microscope integrated with a 1070 nm fiber laser.
• Developed intuitive control software with a multi-touch iPad interface.
• Utilized a high-speed camera for simultaneous multi-object tracking.

Main Results:

• Demonstrated instrument stability of 0.5 nm over 10 s using Allan variance analysis of a trapped 2 μm silica bead.
• Successfully manipulated a variety of micro-scale objects.
• The compact instrument (30x30x35 cm) proved stable and versatile.

Conclusions:

• The developed holographic optical tweezers system offers high stability and precision in a portable form factor.
• Its ease of use and compatibility features make it an ideal tool for collaborative scientific endeavors.
• This instrument advances capabilities in micro-manipulation, 3D structure construction, and precision metrology.