Acevedo-Barrera Anays, Méndez-Fragoso Ricardo, García-Valenzuela Augusto
Opt Lett. 2024 Aug 1;49(15):4234-4237. doi: 10.1364/OL.530992.
The validity of using an effective-medium approach (EMA) to model the reflectivity of a disordered monolayer of particles that scatter light significantly is tested experimentally. To achieve this, we measured the optical reflectivity versus the angle of incidence in an internal reflection configuration of a disordered monolayer of polymeric particles with negligible optical absorption and a diameter of about half a wavelength (size parameter of 1.2) deposited on a glass-air interface. We found a clear effective-medium film equivalence, even for low particle densities and for angles of incidence well beyond the critical angle, where light penetrates the monolayer less than a particle diameter.
使用有效介质近似（EMA）对显著散射光的无序单层颗粒的反射率进行建模的有效性通过实验进行了测试。为了实现这一点，我们测量了沉积在玻璃 - 空气界面上的具有可忽略光吸收且直径约为半波长（尺寸参数为1.2）的聚合物颗粒无序单层在全内反射配置下的光反射率与入射角的关系。我们发现即使对于低颗粒密度以及入射角远超过临界角（此时光穿透单层的深度小于一个颗粒直径）的情况，也存在明显的有效介质薄膜等效性。
