Abstract
An original optical tweezers using one or two chemically etched fiber nano-tips is developed. We demonstrate optical trapping of 1 micrometer polystyrene spheres at optical powers down to 2 mW. Harmonic trap potentials were found in the case of dual fiber tweezers by analyzing the trapped particle position fluctuations. The trap stiffness was deduced using three different models. Consistent values of up to 1 fN/nm were found. The stiffness linearly decreases with decreasing light intensity and increasing fiber tip-to-tip distance.
Highlights
Optical tweezers are well-established since the pioneering work of A
We report on optical trapping of micrometer size dielectric particles using one or two bare optical fiber nano-tips
Optical fiber tips with nanometer size apex are used for trapping experiments in single fiber and dual fiber optical tweezers
Summary
Optical tweezers are well-established since the pioneering work of A. Fiber-based optical tweezers do not require substrates or bulky high numerical aperture objectives They provide easy access to the trapped particle, which is useful for the implementation of further manipulation or characterization elements. High frequency quadrant positions sensors are currently used for particle position recording It was, shown that CMOS camera videos with frame rates of some hundred Hz are sufficient for the accurate force measurements [18]. We report on optical trapping of micrometer size dielectric particles using one or two bare optical fiber nano-tips. The reflected intensity is measured by an amplified Si-photodiode (New Focus 2001) placed after the beam splitter This ”back signal” is a superposition of the transmitted light from the second, opposing fiber tip and the reflection from the tip and, if applicable, the trapped particle. The estimated resolution of 50 nm is of the order of the pixel size, but below the microscope resolution
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