Surface imaging using optically controlled microrods

D. B. Phillips; H. Schäfer; M. Steinhart; M. J. Padgett; M. J. Miles; D. M. Carberry

doi:10.1117/12.893796

9 September 2011 Surface imaging using optically controlled microrods

D. B. Phillips, H. Schäfer, M. Steinhart, M. J. Padgett, M. J. Miles, D. M. Carberry

Proceedings Volume 8097, Optical Trapping and Optical Micromanipulation VIII; 809704 (2011) https://doi.org/10.1117/12.893796
Event: SPIE NanoScience + Engineering, 2011, San Diego, California, United States

Abstract

We present an imaging technique using an optically trapped silica microrod probe controlled using holographic optical tweezers. The probe is raster scanned over a surface, allowing an image to be recorded in a manner analogous to scanning probe microscopy (SPM), with closed loop feedback control provided by high-speed CMOS camera image tracking. We demonstrate a proof of principle of this technique by imaging the surface of an oil droplet. We estimate the normal force exerted on the sample during imaging to be 1 pN. The resolution is limited by the diameter of the microrod tip, thermal motion of the probe and the tracking accuracy. As our technique is not diraction limited, there is scope for signicant improvement by reducing the tip diameter, and position clamping to reduce unwanted thermal motion.

Citation Download Citation

D. B. Phillips, H. Schäfer, M. Steinhart, M. J. Padgett, M. J. Miles, and D. M. Carberry "Surface imaging using optically controlled microrods", Proc. SPIE 8097, Optical Trapping and Optical Micromanipulation VIII, 809704 (9 September 2011); https://doi.org/10.1117/12.893796

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