Shaw Joseph A, Vollmer Michael
Appl Opt. 2017 Jul 1;56(19):G36-G41. doi: 10.1364/AO.56.000G36.
Sun glints are formed by specular reflections of the sun from capillary waves formed by wind blowing over water. These glints are normally colorless for a high sun or take on the color of the light source, such as orange-red during sunset or sunrise. However, when the glints are highly polarized by reflection near the Brewster angle, i.e., with relatively high sun they can change from colorless to a blue appearance caused by blue light leakage through a polarizing filter oriented orthogonal to the plane of polarization of the reflected light. Measurements are shown of crossed-polarizer transmission spectra exhibiting blue and near infrared light leakage for photographic polarizing filters and polarized sunglasses. A variety of photographs is shown to confirm blue light leakage as the source of the blue glint color.
太阳耀斑是由风吹过水面形成的毛细波对太阳的镜面反射形成的。对于高角度的太阳，这些耀斑通常是无色的，或者呈现光源的颜色，比如日落或日出时呈橙红色。然而，当耀斑在布鲁斯特角附近通过反射高度偏振时，即太阳角度相对较高时，它们会从无色变为蓝色，这是由于蓝光通过与反射光偏振平面正交的偏振滤光片泄漏造成的。文中展示了交叉偏振器透射光谱的测量结果，显示了摄影偏振滤光片和偏光太阳镜存在蓝光和近红外光泄漏。还展示了一系列照片，以证实蓝光泄漏是蓝色耀斑颜色的来源。
