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- Fang, Yuntuan, et al.
(författare)
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ENHANCEMENT OF THE DEFECT FIELD OF ONE-DIMENSIONAL PHOTONIC CRYSTALS CONTAINING epsilon- AND mu-NEGATIVE LAYERS
- 2008
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Ingår i: Journal of Russian Laser Research. - : Springer Science and Business Media LLC. - 1071-2836 .- 1573-8760. ; 29:5, s. 460-465
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Tidskriftsartikel (refereegranskat)abstract
- Employing the transfer matrix method, we study the electromagnetic field of one-dimensional photonic crystals with a defect inserted by pairs of mu-negative (MNG) and epsilon-negative (ENG) material layers. The fields within the pairs of layers and the matrix defect are independent of each other, and the whole field is their superposition. The whole defect field can be significantly enhanced by pairs of epsilon-negative and mu-negative layers. In contrast to the conventional defect modes, the intensity and volume of the defect field with pairs of epsilon-negative and mu-negative layers can be precisely adjusted.
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| 4. |
- Hu, Xin, et al.
(författare)
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Equivalent Circuit of Complementary Split-Ring Resonator Loaded Transmission Line
- 2009
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Ingår i: Microwave and optical technology letters (Print). - : Wiley. - 0895-2477 .- 1098-2760. ; 51:10, s. 2432-2434
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Tidskriftsartikel (refereegranskat)abstract
- In this article, a circuit model is proposed for the complementary split-ring resonators (CSRRs) loaded transmission line, and comparisons between the results derived from the equivalent circuit model and the experimental results are given and a good agreement between them over a wide frequency band supports the effectiveness of F the proposed modeling methodology. Both the results show the negative f permittivity at the vicinity of the resonance frequency of CSRR. By comparing the results of different periodic length (i.e., the capacitance per-unit-cell of the host microstrip line is changed), the validity of the equivalent circuit is further confirmed.
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- Lin, Zhili, et al.
(författare)
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An analytical derivation of the optimum source patterns for the pseudospectral time-domain method
- 2009
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Ingår i: Journal of Computational Physics. - : Elsevier BV. - 0021-9991 .- 1090-2716. ; 228:19, s. 7375-7387
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Tidskriftsartikel (refereegranskat)abstract
- In the computational electromagnetics and acoustics, spatially smoothed sources are often utilized to alleviate the aliasing errors in the pseudospectral time-domain (PSTD) algorithms. In our work, an analytical derivation of the optimum source patterns is presented according to the accurately derived expressions of the dominant source-introduced aliasing errors according to the circular discrete convolution and Tailor series expansion method. We quantitatively demonstrate, for the first time in literature, that the aliasing errors can be optimally suppressed and rapidly reduced to the negligible levels by these optimum patterns and with the increment of source cells. We also provide the different implementation schemes of the optimal patterns both for the soft and hard source cases. The numerical calculation and 1D PSTD transient simulations are conducted to verify the excellent performance of these optimum sources.
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- Lin, Zhili, et al.
(författare)
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On the Accuracy and Stability of Several Widely Used FDTD Approaches for Modeling Lorentz Dielectrics
- 2009
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Ingår i: IEEE Transactions on Antennas and Propagation. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-926X .- 1558-2221. ; 57:10, s. 3378-3381
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Tidskriftsartikel (refereegranskat)abstract
- A rigorous and comparative study on the approximation accuracy and stability limits of several widely used finite-difference time-domain (FDTD) approaches, namely the auxiliary differential equation (ADE) approach, the bilinear transform (BT) approach, the Z-transform approach (ZT) and the piecewise linear recursive convolution (PLRC) approach, for modeling dispersive Lorentz dielectrics is presented following the given updating equations between the electric flux density and the electric field intensity. We find the ZT approach with modified material parameters is much more accurate than the original ZT approach and the other three approaches for modeling Lorentz dielectrics. The stability limits of the ADE, ZT and PLRC approaches in simulating Lorentz dielectrics are also shown to be a bit more stringent than that of BT approach which preserves the Courant stability limit as previously reported.
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