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 similar to 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 diffraction limited, there is scope for significant improvement by reducing the tip diameter, and position clamping to reduce unwanted thermal motion.
Translated title of the contribution | Surface Imaging using Optically Controlled Microrods |
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Original language | English |
Title of host publication | Optical Trapping and Optical Micromanipulation VIII |
Subtitle of host publication | SPIE Nanoscience + Engineering | 21-25 August 2011 |
Publisher | Society of Photo-Optical Instrumentation Engineers (SPIE) |
DOIs | |
Publication status | Published - 9 Sept 2011 |
Publication series
Name | Proceedings of SPIE |
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Publisher | SPIE |
Volume | 8097 |
ISSN (Print) | 0277-786X |
ISSN (Electronic) | 1996-756X |
Bibliographical note
Name and Venue of Conference: Optics and Photonics, San Diego USAConference Organiser: SPIE