| 1. |
- Bordag, Michael, et al.
(författare)
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Parallel nano-assembly directed by short-range field forces
- 2006
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Ingår i: Proceedings of the 1st IEEE International Conference on Nano/Micro Engineered and Molecular Systems. - Piscataway, United States : IEEE Press. - 9781424401390 ; , s. 620-622
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Konferensbidrag (refereegranskat)abstract
- We present the ECs Sixth Framework Programme PARNASS project, which stands for 'Parallel nano assembling directed by short-range field forces' and represents a radical innovative approach to fabricating large volumes of hybrid nano electronic devices. The project combines in a synergy the 'top-down' and 'bottom-up' methods addressing one of the challenging physical and engineering problems of the very high accuracy over a large area. An array of specially designed nano-scale force field sources has to be a key part of this innovative approach to large-scale nano manufacturing. © 2006 IEEE.
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| 2. |
- Bordag, Michael, et al.
(författare)
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Analytic corrections to the electromagnetic casimir interaction between a sphere and a plate at shortdistances
- 2010
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Ingår i: International Journal of Modern Physics A. - Singapore : World Scientific. - 0217-751X .- 1793-656X. ; 25:11, s. 2171-2176
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Tidskriftsartikel (refereegranskat)abstract
- For the vacuum interaction of asphere in front of a plane,both obeying conductor boundary conditions, we consider the approximation of small separation. We derive the next-to-leading order of the asymptotic expansion in the separation-to-radius ratio epsilon. This correction is of order epsilon. In opposite to the scalar cases it contains also contributions proportional to logarithms in first and second order, epsilon ln epsilon and epsilon(ln epsilon)(2). We compare this result with the available findings of numerical and experimental approaches.
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| 3. |
- Bordag, Michael, et al.
(författare)
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Beyond proximity force approximation in the casimir effect
- 2009
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Ingår i: International Journal of Modern Physics A. - Singapore : World Scientific. - 0217-751X .- 1793-656X. ; 24:8-9, s. 1743-1747
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Tidskriftsartikel (refereegranskat)abstract
- We compare the analytical and numerical results for the Casimir force for the configuration of a plane and a cylinder in front of a plane. While for Dirichlet boundary conditions on both, plane and sphere or cylinder, agreement is found, for Neumann boundary conditions on either the plane or one of the two, cylinder or sphere, disagreement is found. This holds, for a sphere, also for different boundary conditions on the interacting surfaces. From recent, new numerical results for the cylinder, a general appearance of logarithmic contributions beyond PFA can be predicted.
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| 4. |
- Bordag, Michael, et al.
(författare)
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Casimir force for a sphere in front of a plane beyond proximity force approximation
- 2008
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Ingår i: Journal of Physics A. - Bristol : Institute of Physics Publishing (IOPP). - 1751-8113 .- 1751-8121. ; 41:16, s. 164002-
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Tidskriftsartikel (refereegranskat)abstract
- For the configuration of a sphere in front of a plane, we calculate the first two terms of the asymptotic expansion for small separation of the Casimir force. We consider both Dirichlet and Neumann boundary conditions.
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| 5. |
- Bordag, Michael, et al.
(författare)
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First analytic correction beyond the proximity force approximation in the Casimir effect for the electromagnetic field in sphere-plane geometry
- 2010
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Ingår i: Physical Review D. - College Park, MD : American Physical Society. - 1550-7998 .- 1550-2368. ; 81:6, s. Article number 065011-
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Tidskriftsartikel (refereegranskat)abstract
- We consider the vacuum energy for a configuration of a sphere in front of a plane, both obeying the conductor boundary condition, at small separation. For the separation becoming small we derive the first next-to-leading order of the asymptotic expansion in the separation-to-radius ratio epsilon. This correction is of order epsilon. Opposite to the scalar cases it contains also contributions proportional to logarithms in first and second order, epsilon ln epsilon and epsilon(ln epsilon)(2). We compare this result with the available findings of numerical and experimental approaches.
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| 6. |
- Bordag, Michael
(författare)
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Interaction of a charge with a thin plasma sheet
- 2007
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Ingår i: Physical Review D. Particles and fields. - College Park, MD : American Physical Society. - 0556-2821 .- 1089-4918. ; 76:6, s. 065011-
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Tidskriftsartikel (refereegranskat)abstract
- The interaction of the electromagnetic field with a two-dimensional plasma sheet intended to describe the pi-electrons of a carbon nanotube or a C-60 molecule is investigated. By first integrating out the displacement field of the plasma or the electromagnetic field, different representations for quantities like the Casimir energy are derived which are shown to be consistent with one another. Starting from the covariant gauge for the electromagnetic field, it is shown that the matching conditions to which the presence of the plasma sheet can be reduced are different from the commonly used ones. The difference in the treatments does not show up in the Casimir force between two parallel sheets, but it is present in the Casimir-Polder force between a charge or a neutral atom and a sheet. At once, since the plasma sheet is a regularization of the conductor boundary conditions, this sheds light on the difference in physics found earlier in the realization of conductor boundary conditions as "thin" or "thick" boundary conditions in Phys. Rev. D 70, 085010 (2004).
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| 7. |
- Bordag, Michael, et al.
(författare)
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Shear stress measurements on InAs nanowires by AFM manipulation
- 2007
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Ingår i: Small. - Weinheim : Wiley-VCH Verlagsgesellschaft. - 1613-6810 .- 1613-6829. ; 3:8, s. 1398-1401
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Tidskriftsartikel (refereegranskat)abstract
- On an upward curve? The curvature of an elastically deformed nanowire pinned to a flat surface contains information about the maximum static friction force, and hence the shear stress, between the nanowire and the surface. Here, InAs nanowires are bent in a controlled manner using the tip of an atomic force microscope (see image). The shear stress can be obtained from a simple analysis according to the standard theory of elasticity.
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| 8. |
- Bordag, Michael, et al.
(författare)
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The vacuum energy for two cylinders with one increasing in size
- 2009
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Ingår i: Journal of Physics A. - Bristol : Institute of Physics (IOP). - 1751-8113 .- 1751-8121. ; 42:41, s. 415203-
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Tidskriftsartikel (refereegranskat)abstract
- We consider the vacuum energy for the configuration of two cylinders and obtain its asymptotic expansion if the radius of one of these cylinders becomes large while the radius of the other one and their separation are kept fixed. We calculate explicitly the next-to-leading order correction to the vacuum energy for the radius of the other cylinder becoming large or small.
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| 9. |
- Conache, Gabriela, et al.
(författare)
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AFM-based manipulation of InAs nanowires
- 2008
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Ingår i: Proceedings of the IVC-17 (17th International Vacuum Congress) [also] ICSS-13 (13th International Conference on Surface Science) [also] ICN+T-2007 (International Conference on Nanoscience and Technology). - Bristol : Institute of Physics (IOP). ; 100, s. 052051-052051
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Konferensbidrag (refereegranskat)abstract
- A controlled method of manipulation of nanowires was found using the tip of an Atomic Force Microscope (AFM). Manipulation is done in the ‘Retrace Lift’ mode, where feedback is turned off for the reverse scan and the tip follows a nominal path. The effective manipulation force during the reverse scan can be changed by varying an offset in the height of the tip over the surface. Using this method, we have studied InAs nanowires on different substrates. We have also investigated interactions between wires and with gold features patterned onto the substrates.
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| 10. |
- Pettersson, Håkan, et al.
(författare)
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Friction measurements on InAs NWs by AFM manipulation
- 2008
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Konferensbidrag (refereegranskat)abstract
- We discuss a new approach to measure the friction force between elastically deformed nanowires and a surface. The wires are bent, using an AFM, into an equilibrium shape determined by elastic restoring forces within the wire and friction between the wire and the surface. From measurements of the radius of curvature of the bent wires, elasticity theory allows the friction force per unit length to be calculated. We have studied friction properties of InAs nanowires deposited on SiO2, silanized SiO2 and Si3N4 substrates. The wires were typically from 0.5 to a few microns long, with diameters varying between 20 and 80 nm. Manipulation is done in a `Retrace Lift' mode, where feedback is turned off for the reverse scan and the tip follows a nominal path. The effective manipulation force during the reverse scan can be changed by varying an offset in the height of the tip over the surface. We will report on interesting static- and sliding friction experiments with nanowires on the different substrates, including how the friction force per unit length varies with the diameter of the wires.
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