Numerical study on spectral properties of tungsten one-dimensional surface-relief gratings for spectrally selective devices.
Numerical study on spectral properties of tungsten one-dimensional surface-relief gratings for spectrally selective devices.
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DOI：
10.1364/josaa.22.001805
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发表时间：
2005-09
期刊：
影响因子：
--
通讯作者：
H. Sai;Y. Kanamori;K. Hane;H. Yugami
中科院分区：
文献类型：
--
作者：
H. Sai;Y. Kanamori;K. Hane;H. Yugami
采用时域有限差分法，采用多洛伦兹模型，研究了不同沟槽深度和宽度的一维钨光栅的光谱特性。当电场振荡方向平行于光栅矢量时，浅光栅表面等离子体激元会产生较强的吸收峰。另一方面，当电场的振荡方向垂直于光栅矢量时，由于微腔效应，宽槽深光栅的吸收率不同。与窄槽，另一个吸收与d-依赖性发生，这可能是由于垂直振荡的表面等离子体的凹槽。
Spectral properties of one-dimensional tungsten gratings with various depths and widths of grooves were investigated by means of finite-difference time-domain simulation with a multi-Lorentz model. Shallow gratings showed a strong absorption peak due to surface plasmon polaritons when the oscillation of the electric field was parallel to the grating vector. On the other hand, deep gratings with wide grooves showed a different absorption attributed to the microcavity effect when the oscillation of the electric field was perpendicular to the grating vector. With narrowed grooves, another absorption with d-dependence occurred, which was probably due to vertically oscillating surface plasmons to the grooves.