Surface imaging using optically controlled microrods
Autor(en): | Phillips, D.B. Schäfer, H. Steinhart, M. Padgett, M.J. Miles, M.J. Carberry, D.M. |
Stichwörter: | Closed-loop feedback control; CMOS camera; Diffraction limited; High-speed; Holographic optical tweezers; Microrods; Normal forces; Oil droplets; Optically controlled; Proof of principles; Surface imaging; Thermal motion; Tracking accuracy, CMOS integrated circuits; Imaging techniques; Micromanipulators; Probes; Scanning probe microscopy; Silica, Optical tweezers | Erscheinungsdatum: | 2011 | Journal: | Proceedings of SPIE - The International Society for Optical Engineering | Volumen: | 8097 | Zusammenfassung: | 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 diffraction limited, there is scope for significant improvement by reducing the tip diameter, and position clamping to reduce unwanted thermal motion. © 2011 SPIE. |
Beschreibung: | Conference of Optical Trapping and Optical Micromanipulation VIII ; Conference Date: 21 August 2011 Through 25 August 2011; Conference Code:86932 |
ISBN: | 9780819487070 | ISSN: | 0277786X | DOI: | 10.1117/12.893796 | Externe URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-80054064187&doi=10.1117%2f12.893796&partnerID=40&md5=49d41705e691b8b2c76f55b06bf9e92b |
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