Rather than fine-tune metamaterial to exact specifications, which is finicky and expensive, the researchers used nanoparticles of cobalt, which are relatively easy to get hold of, and suspended them in kerosene.
研究者并没有对超材料
具体规格进行微调,因为这样既繁杂又增加成本,他们使用了钴
纳米粒子,这个相对而言容易得到,可以把它们暂时存放在煤油中。