更新折射率
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@@ -12,8 +12,13 @@ A 532 nm laser was primarily used as the excitation source,
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三个入射方向配置
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// 在之前的很多计算中,我们使用的折射率为 2.73。接下来我们将它更新到 2.7。
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// 但实际上,这个影响非常小,在图中肉眼完全看不出来。各种因素导致的误差也远大于
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// 因此,对于一些没有明确标识数值的图,我们就不再专门更新;只更新那些明确标识的数值。
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// 同时,由于计算过程中就有舍入,所以只要变化不大的数值,也完全没有必要再计算一遍。
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有三个不同的入射配置,包括正入射、掠入射、边入射。
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考虑到 4 度斜切和 4H-SiC 几乎各向同性的折射率(2.73) @shaffer_refractive_1971 ,掠入射的入射角大约为 25 度。
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考虑到 4 度斜切和 4H-SiC 几乎各向同性的折射率(2.7) @shaffer_refractive_1971 ,掠入射的入射角大约为 25 度。
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在正散射过程中,我们使用 100 微米的共焦针孔,以尽可能提高 z 方向的分辨率 @song_depth_2020;其它情况使用常用的 200 微米针孔以提高信噪比。
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此外,在正入射和边入射时,拉曼散射信号较强,因此我们使用较短的积分时间(约 60 秒),
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而在掠入射时,拉曼信号较弱,因此使用较长的积分时间(约 300 秒)。
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@@ -22,14 +27,17 @@ Three distinct incidence configurations were utilized, as illustrated in @figure
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(i) normal incidence, where the laser incident perpendicularly to the epitaxial surface;
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(ii) grazing incidence, where the laser incident nearly parallelly to the epitaxial surface;
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and (iii) edge incidence, where the laser is incident at the wafer edge and perpendicularly to the edge surface.
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Considering the 4° offcut angle and the nearly isotropic refractive index of 2.73 for 4H-SiC @shaffer_refractive_1971,
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Considering the 4° offcut angle and the nearly isotropic refractive index of 2.7 for 4H-SiC @shaffer_refractive_1971,
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the refracted laser in grazing incidence forms an angle of approximately 25° with the c axis.
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A 100 μm confocal pinhole was used for normal incidence to enhance axial (z-direction) resolution @song_depth_2020,
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while a 200 μm pinhole was employed for the other configurations to improve the signal-to-noise ratio.
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The integration time was set to 60 seconds for normal and edge incidence,
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while it was extended to 300 seconds for grazing incidence due to the weaker Raman signal.
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// 对应于入射配置的位置,计算为 1.0263158 E-3 A-1
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// 这里列出波长(单位 nm)、采用的折射率、波矢(单位 um-1),z y x 方向的倒格子长度(单位 um-1),以及沿z y x方向的约化波矢(单位 1e-3)
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// 325 2.9 17.85 987.54 3732.92 3232.80 18.08 4.78 5.52
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// 532 2.7 10.15 987.54 3732.92 3232.80 10.28 2.72 3.14
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// 633 2.65 8.37 987.54 3732.92 3232.80 8.48 2.42 2.59
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偏振的配置?
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画图/入射角度与偏移/plot.ipynb
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画图/入射角度与偏移/plot.ipynb
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