Nanobore fiber focus trap with enhanced tuning capabilities

Area of Science:

• Optics and Photonics
• Nanotechnology
• Micro-object Manipulation

Background:

• Dual fiber traps confine micro-objects by balancing optical forces from light beams.
• Standard traps use step-index fibers, limiting tuning and stiffness control.

Purpose of the Study:

• To demonstrate a novel dual fiber trap utilizing nanobore fibers.
• To investigate the trapping potential and performance improvements offered by nanobore fibers compared to standard fibers.

Main Methods:

• Fabrication and implementation of a dual fiber trap using nanobore fibers.
• Evaluation of trap performance, including stiffness, as a function of fiber separation.
• Comparison with theoretical predictions and standard step-index fiber traps.

Main Results:

• Nanobore fibers create a unique optical intensity distribution and higher field gradients.
• The nanobore fiber trap exhibits significantly higher stiffness at short inter-fiber separations.
• Axial stiffness at intermediate distances was lower than standard fiber traps, indicating tunable stiffness properties.

Conclusions:

• Nanobore fibers offer superior tuning properties for dual fiber optical traps.
• This technology enables access to unique combinations of transverse and axial stiffness unattainable with standard fibers.
• The nanobore fiber trap represents a significant advancement in micro-object manipulation and optical trapping.