Marciniak Magdalena, Broda Artur, Gębski Marcin, Dems Maciej, Muszalski Jan, Czerwinski Andrzej, Ratajczak Jacek, Marona Łucja, Nakwaski Włodzimierz, Lott James A, Czyszanowski Tomasz
Opt Express. 2020 Jul 6;28(14):20967-20977. doi: 10.1364/OE.396693.
We report the first experimental parametric analysis of subwavelength monolithic high-contrast grating (MHCG) mirrors. To date, subwavelength grating mirrors have been fabricated by suspending a thin grating membrane in the air or placing it on a low refractive index material - a scheme that requires sophisticated processing and makes the gratings sensitive to mechanical stress, impeding current injection, and heat dissipation if used in active devices. Inherently MHCGs are well suited for optoelectronic devices because they can be fabricated in all possible material systems. Here we demonstrate above 90% optical power reflectance, strong polarization discrimination. Based on experimental analysis aided by numerical simulations, we demonstrate the possibility of tuning the spectral characteristics of MHCGs reflectance for more than 200 nm via modification of the duty cycle of the MHCG stripes. We show our MHCG tuning method is convenient to define the properties of MHCG devices during the device processing.
我们报告了对亚波长单片高对比度光栅（MHCG）反射镜的首次实验参数分析。迄今为止，亚波长光栅反射镜是通过将薄光栅膜悬浮在空气中或将其放置在低折射率材料上制造的——这种方案需要复杂的加工，并且使光栅对机械应力敏感，如果用于有源器件，会阻碍电流注入和散热。本质上，MHCG非常适合用于光电器件，因为它们可以在所有可能的材料系统中制造。在此，我们展示了超过90%的光功率反射率以及强烈的偏振辨别能力。基于数值模拟辅助的实验分析，我们证明了通过修改MHCG条纹的占空比，可以将MHCG反射率的光谱特性调谐超过200纳米。我们表明，我们的MHCG调谐方法便于在器件加工过程中定义MHCG器件的特性。
