余弦高斯光束通过负折射率介质的传输特性

摘要

Under condition of paraxial approximation ,the analytical expression is obtained for the intensity function of a cosine‐Gaussian beam passing through negative index medium based on the Collins’ formula .The influence of intensity of cosine‐Gaussian beams due to negative index medium’s frequency and cosine‐Gaussian beams’ modulation parameter are analyzed . Numerical examples show that the intensity of cosine‐Gaussian beams can be modulated by the frequency of negative index medium . The results provide a new method and technique for controlling the beam intensity .%在傍轴近似情况下，利用柯林斯公式计算出了余弦高斯光束通过负折射率介质的光强解析表达式。研究了负折射率材料工作频率和余弦高斯光束的调制参数对余弦高斯光束光强的影响。计算结果表明：可以利用负折射率介质的工作频率控制余弦高斯光束的光强。此研究结果提供了一种控制余弦高斯光束传输特性的新方法和技术。