Opt Lett. 2013 Nov 15;38(22):4731-4. doi: 10.1364/OL.38.004731.
A virtual all-optical tunable terahertz Fresnel zone plate is achieved utilizing the localized distribution of the transient electron plasma on a silicon wafer. Its focusing and imaging performance are experimentally demonstrated. Experimental results show that the effect of the virtual zone plate is the same as an actual one. Adjusting the spatial pattern of the electron plasma, the central wavelength and the focal length of the virtual zone plate can be all-optically dynamically steered. The research is a significant step to the development of tunable optical imaging elements.
利用硅片上瞬态电子等离子体的局域分布，实现了虚拟全光可调太赫兹菲涅尔波带片。实验验证了其聚焦和成像性能。实验结果表明，虚拟波带片的效果与实际波带片相同。通过调整电子等离子体的空间图案，可以对虚拟波带片的中心波长和焦距进行全光动态控制。这项研究是开发可调谐光学成像元件的重要一步。
