Structural anisotropy and orientation-induced Casimir repulsion in fluids
In this work we theoretically consider the Casimir force between two periodic arrays of nanowires (both in vacuum, and on a substrate separated by a fluid) at separations comparable to the period. Specifically, we compute the dependence of the exact Casimir force between the arrays under both latera...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/65123 https://orcid.org/0000-0001-7327-4967 https://orcid.org/0000-0002-7244-3682 |
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| author | McCauley, Alexander Patrick Rosa, F. S. S. Rodriguez, Alejandro W. Joannopoulos, John D. Dalvit, D. A. R. Johnson, Steven G. |
| author2 | Massachusetts Institute of Technology. Department of Mathematics |
| author_facet | Massachusetts Institute of Technology. Department of Mathematics McCauley, Alexander Patrick Rosa, F. S. S. Rodriguez, Alejandro W. Joannopoulos, John D. Dalvit, D. A. R. Johnson, Steven G. |
| author_sort | McCauley, Alexander Patrick |
| collection | MIT |
| description | In this work we theoretically consider the Casimir force between two periodic arrays of nanowires (both in vacuum, and on a substrate separated by a fluid) at separations comparable to the period. Specifically, we compute the dependence of the exact Casimir force between the arrays under both lateral translations and rotations. Although typically the force between such structures is well characterized by the proximity force approximation (PFA), we find that in the present case the microstructure modulates the force in a way qualitatively inconsistent with PFA. We find instead that effective-medium theory, in which the slabs are treated as homogeneous, anisotropic dielectrics, gives a surprisingly accurate picture of the force, down to separations of half the period. This includes a situation for identical, fluid-separated slabs in which the exact force changes sign with the orientation of the wire arrays, whereas PFA predicts attraction. We discuss the possibility of detecting these effects in experiments, concluding that this effect is strong enough to make detection possible in the near future. |
| first_indexed | 2024-09-23T13:06:12Z |
| format | Article |
| id | mit-1721.1/65123 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:06:12Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/651232022-09-28T12:01:46Z Structural anisotropy and orientation-induced Casimir repulsion in fluids McCauley, Alexander Patrick Rosa, F. S. S. Rodriguez, Alejandro W. Joannopoulos, John D. Dalvit, D. A. R. Johnson, Steven G. Massachusetts Institute of Technology. Department of Mathematics Massachusetts Institute of Technology. Department of Physics Joannopoulos, John D. McCauley, Alexander Patrick Rodriguez, Alejandro W. Joannopoulos, John D. Johnson, Steven G. In this work we theoretically consider the Casimir force between two periodic arrays of nanowires (both in vacuum, and on a substrate separated by a fluid) at separations comparable to the period. Specifically, we compute the dependence of the exact Casimir force between the arrays under both lateral translations and rotations. Although typically the force between such structures is well characterized by the proximity force approximation (PFA), we find that in the present case the microstructure modulates the force in a way qualitatively inconsistent with PFA. We find instead that effective-medium theory, in which the slabs are treated as homogeneous, anisotropic dielectrics, gives a surprisingly accurate picture of the force, down to separations of half the period. This includes a situation for identical, fluid-separated slabs in which the exact force changes sign with the orientation of the wire arrays, whereas PFA predicts attraction. We discuss the possibility of detecting these effects in experiments, concluding that this effect is strong enough to make detection possible in the near future. 2011-08-12T14:48:46Z 2011-08-12T14:48:46Z 2011-05 2010-09 Article http://purl.org/eprint/type/JournalArticle 1050-2947 1094-1622 http://hdl.handle.net/1721.1/65123 McCauley, Alexander et al. “Structural Anisotropy and Orientation-induced Casimir Repulsion in Fluids.” Physical Review A 83.5 (2011) ©2011 American Physical Society https://orcid.org/0000-0001-7327-4967 https://orcid.org/0000-0002-7244-3682 en_US http://dx.doi.org/10.1103/PhysRevA.83.052503 Physical Review A Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | McCauley, Alexander Patrick Rosa, F. S. S. Rodriguez, Alejandro W. Joannopoulos, John D. Dalvit, D. A. R. Johnson, Steven G. Structural anisotropy and orientation-induced Casimir repulsion in fluids |
| title | Structural anisotropy and orientation-induced Casimir repulsion in fluids |
| title_full | Structural anisotropy and orientation-induced Casimir repulsion in fluids |
| title_fullStr | Structural anisotropy and orientation-induced Casimir repulsion in fluids |
| title_full_unstemmed | Structural anisotropy and orientation-induced Casimir repulsion in fluids |
| title_short | Structural anisotropy and orientation-induced Casimir repulsion in fluids |
| title_sort | structural anisotropy and orientation induced casimir repulsion in fluids |
| url | http://hdl.handle.net/1721.1/65123 https://orcid.org/0000-0001-7327-4967 https://orcid.org/0000-0002-7244-3682 |
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