Wu Tao, Lai Jianjun, Wang Shaowu, Li Xiaoping, Huang Ying
Appl Opt. 2017 Jul 20;56(21):5844-5848. doi: 10.1364/AO.56.005844.
A new periodic Al groove structure coated by SiO thin film is designed and numerically investigated for wide-angle and polarization-insensitive broadband absorption. A metal groove array presents optical absorption enhancement due to the cavity mode resonance, with the absorption peak capable of being shifted by controlling the depth of the metal groove. Broadband absorption can be realized by a periodic array of metal grooves with different depths combined in one single period. A two-dimensional Al structure with four different grooves in each period is designed to realize polarization-insensitive broadband absorption from 220 nm to 800 nm with average absorption efficiency over 80% within the incident angle of 40°. These wide-angle and broadband absorption structures can be applied in UV/visible-related biochemical sensors, solar cells, or photocatalysts.
设计了一种由SiO薄膜包覆的新型周期性铝槽结构，并对其进行了数值研究，以实现广角和偏振不敏感的宽带吸收。金属槽阵列由于腔模共振而呈现出光吸收增强，通过控制金属槽的深度可以使吸收峰发生移动。通过在单个周期内组合不同深度的金属槽的周期性阵列可以实现宽带吸收。设计了一种在每个周期内具有四种不同槽的二维铝结构，以实现从220nm到800nm的偏振不敏感宽带吸收，在40°入射角范围内平均吸收效率超过80%。这些广角和宽带吸收结构可应用于紫外/可见光相关的生化传感器、太阳能电池或光催化剂。
