Coherent backscattering cone shape depends on the beam size
Coherent backscattering (CBS) is a beautiful physical phenomenon that takes place in a highly scattering medium, which has potential application in noninvasive optical property measurement. The current model that explains the CBS cone shape, however, assumes the incoming beam diameter is infinitely...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/97061 http://hdl.handle.net/10220/10882 |
| _version_ | 1811687159571152896 |
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| author | Bi, Renzhe Dong, Jing Lee, Kijoon |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Bi, Renzhe Dong, Jing Lee, Kijoon |
| author_sort | Bi, Renzhe |
| collection | NTU |
| description | Coherent backscattering (CBS) is a beautiful physical phenomenon that takes place in a highly scattering medium, which has potential application in noninvasive optical property measurement. The current model that explains the CBS cone shape, however, assumes the incoming beam diameter is infinitely large compared to the transport length. In this paper, we evaluate the effect of a finite scalar light illumination area on the CBS cone, both theoretically and experimentally. The quantitative relationship between laser beam size and the CBS cone shape is established by using two different finite beam models (uniform top hat and Gaussian distribution). A series of experimental data with varying beam diameters is obtained for comparison with the theory. Our study shows the CBS cone shape begins to show distortion when beam size becomes submillimeter, and this effect should not be ignored in general. In biological tissue where a normal large beam CBS cone is too narrow for detection, this small beam CBS may be more advantageous for more accurate and higher resolution tissue characterization. |
| first_indexed | 2024-10-01T05:11:53Z |
| format | Journal Article |
| id | ntu-10356/97061 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:11:53Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/970612023-12-29T06:48:55Z Coherent backscattering cone shape depends on the beam size Bi, Renzhe Dong, Jing Lee, Kijoon School of Chemical and Biomedical Engineering Coherent backscattering (CBS) is a beautiful physical phenomenon that takes place in a highly scattering medium, which has potential application in noninvasive optical property measurement. The current model that explains the CBS cone shape, however, assumes the incoming beam diameter is infinitely large compared to the transport length. In this paper, we evaluate the effect of a finite scalar light illumination area on the CBS cone, both theoretically and experimentally. The quantitative relationship between laser beam size and the CBS cone shape is established by using two different finite beam models (uniform top hat and Gaussian distribution). A series of experimental data with varying beam diameters is obtained for comparison with the theory. Our study shows the CBS cone shape begins to show distortion when beam size becomes submillimeter, and this effect should not be ignored in general. In biological tissue where a normal large beam CBS cone is too narrow for detection, this small beam CBS may be more advantageous for more accurate and higher resolution tissue characterization. Published version 2013-07-02T03:12:14Z 2019-12-06T19:38:29Z 2013-07-02T03:12:14Z 2019-12-06T19:38:29Z 2012 2012 Journal Article Bi, R., Dong, J., & Lee, K. (2012). Coherent backscattering cone shape depends on the beam size. Applied Optics, 51(26), 6301-6306. https://hdl.handle.net/10356/97061 http://hdl.handle.net/10220/10882 10.1364/AO.51.006301 en Applied optics © 2012 Optical Society of America. This paper was published in Applied Optics and is made available as an electronic reprint (preprint) with permission of Optical Society of America. The paper can be found at the following official DOI: [http://dx.doi.org/10.1364/AO.51.006301]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. application/pdf |
| spellingShingle | Bi, Renzhe Dong, Jing Lee, Kijoon Coherent backscattering cone shape depends on the beam size |
| title | Coherent backscattering cone shape depends on the beam size |
| title_full | Coherent backscattering cone shape depends on the beam size |
| title_fullStr | Coherent backscattering cone shape depends on the beam size |
| title_full_unstemmed | Coherent backscattering cone shape depends on the beam size |
| title_short | Coherent backscattering cone shape depends on the beam size |
| title_sort | coherent backscattering cone shape depends on the beam size |
| url | https://hdl.handle.net/10356/97061 http://hdl.handle.net/10220/10882 |
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