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wojinjin金虫 (小有名气)
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【求助】多层膜反射率的计算
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多层膜反射率的计算过程中，在第一个界面出射的光进入第二个界面时有个相位延迟，这个相位延迟在不同的课本上有两种表示方法，应该是说完全不同两种表述方法，有的书上是2*PI/lamata *n*d*cos(theta), theta 是折射角，lamata 是波长，而有的书上是除以 cos(theta),我认为是应该后者，各位虫友们发表下意见吧！ [ Last edited by wojinjin on 2009-9-10 at 18:48 ] |
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freyalovers
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6楼2009-09-10 13:06:34
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all these two expressions are correct BUT NOT THE SAME. (using your words) An incident beam line is divided into two parts, the deflected and refracted, at an interface between the media #1 and #2. Your expression of 2*PI/lamata *n*d*cos(theta) is the TOTAL PHASE DIFFERENCE between these two beam lines in the media #1, which includes two parts, the phase lapse of the refracted beam line in media #2 (=2*PI *n*d*/[lamata*cos(theta)]), and the phase lapse of the deflected beam line in media #1 (=2*n*d*tan(theta)*sin(theta)). Therefore, the expression of 2*PI *n*d*/[lamata*cos(theta)], which you found in some other textbooks, is only a phase lapse of the refracted beam line in media #2. Sorry for making you confused in my last post. [ Last edited by bote on 2009-9-13 at 08:22 ] |
7楼2009-09-11 15:31:41