Appl Opt. 2023 Apr 10;62(11):2821-2826. doi: 10.1364/AO.486313.
The Brewster effect, which is known as a notable physical law, has promising prospects in perfect absorption and angular selectivity transmission. The Brewster effect in isotropic materials has been investigated extensively in previous works. However, the research on anisotropic materials has been rarely carried out. In this work, we theoretically investigate the Brewster effect in quartz crystals with tilted optical axes. The conditions for the occurrence of the Brewster effect in anisotropic materials are derived. The numerical results show that by changing the orientation of the optical axis, we have effectively regulated the Brewster angle of crystal quartz. The reflection of crystal quartz versus the wavenumber and incidence angle at different tilted angles is studied. In addition, we discuss the effect of the hyperbolic region on the Brewster effect of crystal quartz. The Brewster angle negatively correlates with the tilted angle when the wavenumber is 460 (Type-II). In contrast, when the wavenumber is 540 (Type-I), the Brewster angle positively correlates with the tilted angle. Finally, the relationship between the Brewster angle and wavenumber at different tilted angles is investigated. The findings in this work will broaden the research field of crystal quartz and open the door for tunable Brewster devices based on anisotropic materials.
布儒斯特效应，作为一种显著的物理定律，在完美吸收和角度选择传输方面具有广阔的前景。各向同性材料中的布儒斯特效应在之前的研究中已经得到了广泛的研究。然而，各向异性材料的研究却很少进行。在这项工作中，我们从理论上研究了具有倾斜光轴的石英晶体中的布儒斯特效应。推导出各向异性材料中布儒斯特效应发生的条件。数值结果表明，通过改变光轴的方向，我们有效地调节了晶体石英的布儒斯特角。研究了晶体石英在不同倾斜角下的反射率与波数和入射角之间的关系。此外，我们还讨论了双曲区域对晶体石英布儒斯特效应的影响。当波数为 460 时（Type-II），布儒斯特角与倾斜角呈负相关。相比之下，当波数为 540 时（Type-I），布儒斯特角与倾斜角呈正相关。最后，研究了不同倾斜角下布儒斯特角与波数之间的关系。这项工作的发现将拓宽晶体石英的研究领域，并为基于各向异性材料的可调谐布儒斯特器件开辟道路。
