Physics – Classical Physics
Scientific paper
2009-02-16
Physical Review A 79(2), 023813 (2009)
Physics
Classical Physics
8 pages, RevTeX 4. Removed an erroneous factor of mu/mu_0 from Eq.(1)
Scientific paper
10.1103/PhysRevA.79.023813
There exist two popular energy-momentum tensors for an electromagnetic wave in a dielectric medium. The Abraham expression is robust to experimental verification but more mathematically demanding, while the Minkowski expression is the foundation of a number of simplifications commonly found within the literature, including the relative refractive index transformation often used in modelling optical tweezers. These simplifications are based on neglecting the Minkowski tensor's material counterpart, a process known to be incompatible with conservation of angular momentum, and in conflict with experimental results, yet they are very successful in a wide range of circumstances. This paper combines existing constraints on their usage with recent theoretical analysis to obtain a list of conditions which much be satisfied to safely use the simplified Minkowski approach. Applying these conditions to an experiment proposed by Padgett et al., we find their prediction in agreement with that obtained using the total energy-momentum tensor.
Heckenberg Norman R.
Nieminen Timo A.
Pfeifer Robert N. C.
Rubinsztein-Dunlop Halina
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