Ahlawat, Sunita ; Verma, Ravi Shanker ; Dasgupta, Raktim ; Gupta, Pradeep Kumar (2011) Long-distance optical guiding of colloidal particles using holographic axilens Applied Optics, 50 (13). pp. 1933-1940. ISSN 0003-6935
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Official URL: http://www.opticsinfobase.org/abstract.cfm?URI=ao-...
Related URL: http://dx.doi.org/10.1364/AO.50.001933
Abstract
We report the use of an aspheric holographic optical element (axilens) that essentially combines the properties of the long focal depth of an axicon and the high energy concentration of a conventional spherical lens for long-distance guiding of microscopic objects. With the use of the axilens, polystyrene spheres (~6μ m diameter) could be transported over a distance of ~16mm that was ~3 times longer compared with that obtained using a spherical lens of focal length identical to the mean focal length of the axilens. Further, due to the availability of good on-axis power density, even objects having very marginally higher refractive index than the medium (differing only at third decimal place) could be guided with a guiding speed of ~5μ m/s.
Item Type: | Article |
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Source: | Copyright of this article belongs to Optical Society of America. |
ID Code: | 83462 |
Deposited On: | 21 Feb 2012 07:55 |
Last Modified: | 21 Feb 2012 07:55 |
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