Optimum Excitation of Optical Surface Waves
Optimum Excitation of Optical Surface Waves
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DOI：
10.1364/josa.61.001467
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发表时间：
1971-11
影响因子：
--
通讯作者：
R. Ulrich
中科院分区：
文献类型：
--
作者：
R. Ulrich
棱镜膜耦合器的理论被推广到包括耦合间隙和光导膜的厚度沿传播方向沿着变化的情况。间隙和薄膜的轮廓相对于输入光束进行了优化，从而导致实际上统一的理论耦合效率。结果表明，最佳耦合问题等价于输入光束的空间振幅分布与耦合器漏场的匹配问题。将该理论应用于具有线性锥形间隙的耦合器，得到0.96的理论耦合效率。在实验上，已经实现了0.88的效率。
The theory of the prism–film coupler is generalized to include cases in which the thicknesses of both the coupling gap and of the light-guiding film vary along the direction of propagation. The profiles of gap and film are optimized with respect to the input beam, resulting in a theoretical coupling efficiency of practically unity. It is shown that the problem of optimum coupling is equivalent to the problem of matching the spatial amplitude distribution of the input beam to the leakage field of the coupler. This theory is applied to a coupler with a linearly tapered gap, yielding a theoretical coupling efficiency of 0.96. Experimentally, an efficiency of 0.88 has been achieved.