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It is revealed by the finite difference time domain simulation that a cross aperture antenna can create a localized circularly polarized light, 10 nm in diameter, on the surface of a recording medium. The confined circularly polarized light on the surface, however, expands in the recording layer. We eventually find that the newly proposed modified cross aperture in combination with particle medium leads to confinement of a circularly polarized light in the particle. This proposed combination of a surface plasmon antenna/aperture and recording particles is one of the strategies to achieve high speed and high density for all-optical magnetic recording.

Numerical study of the multipole expansion for the multilevel fast multipole algorithm (MLFMA) is presented. In the numerical implementation of MLFMA, the error comes from three sources: the truncation of the addition theorem; the approximation of the integration; and the aggregation and disaggregation process. These errors are due to the factorization of the Green's function which is the mathematical core of this algorithm. Among the three error sources, we focus on the truncation error in this paper and a new approach of selecting truncation numbers for the addition theorem is proposed. Using this approach, the error prediction and control can be improved for the small buffer sizes and high accuracy requirements.Index Terms-Addition theorem, error analysis, fast multipole method, multilevel fast multipole algorithm (MLFMA).

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A novel algorithm is proposed for solving coupled Maxwell and Schrödinger equations relying on the use of a length gauge form of the coupling between an electromagnetic field and electrons. Numerical simulations using codes implemented with the proposed and conventional algorithms have been performed for a harmonic model of a nanoplate subjected to a pulsed laser field whose central frequency is close to the plasmon frequency. We verify that the proposed algorithm can reduce computational time almost by half as compared with the conventional method. Figure 4. Relative error « of the time-dependent probability density measured at y = 0, | c (y = 0, t)| 2 for an electron confined by a 1D harmonic oscillator potential. in 2002. His research interest is concerned with computational electromagnetics. 544 S. OHNUKI ET AL.

We propose a novel and efficient algorithm to parallelize the finite-difference time-domain method, where the observation period is divided into an arbitrary number of subsections, whose computation is distributed to corresponding computer nodes. The proposed algorithm roughly reduces the computational time to an nth fraction of the conventional algorithm, where n is the number of nodes for parallel computing, thus verifying its efficiency improvement.

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