一项日前发表于《科学》杂志的研究显示,科学家研制出一种比其聚焦的光波还薄的镜头。这类由扭曲光线的超材料制成的镜头,或许有一天能替代用于从显微镜到手机摄像头的所有物件的较重玻璃镜头。在普通镜头中,几毫米甚至几厘米厚的弯曲玻璃表面将光线重新定向至一个普通的焦点。为改善成像,比如说去掉畸变或者确保不同光线波长均被正确聚焦,人们不得不持续增加玻璃层。于是,照相机、显微镜和望远镜部分受到其所需镜 A recent study published in Science magazine showed that scientists have developed a lens that is thinner than its focused light wave. These lenses, made of twisted light metamaterials, may one day replace the heavier glass lenses used for everything from a microscope to a cellphone camera. In ordinary lenses, curved glass surfaces of a few millimeters or even centimeters thick redirect light to a common focus. To improve imaging, such as removing distortion or ensuring that different light wavelengths are correctly focused, one has to continually increase the glass layer. As a result, the camera, microscope, and telescope are partially mirrored