中国光学期刊网

We suggest tailoring of the illumination’s complex degree of coherence for imaging specific two- and three-point objects with resolution far exceeding the Rayleigh limit. We first derive a formula for the image intensity via the pseudo-mode decomposition and the fast Fourier transform valid for any partially coherent illumination (Schell-like, non-uniformly correlated, twisted) and then show how it can be used for numerical image manipulations. Further, for Schell-model sources, we show the improvement of the two- and three-point resolution to 20% and 40% of the classic Rayleigh distance, respectively.

光场的偏振态作为光场调控的一个新自由度，逐渐成为研究者们关注的热点。对光场偏振态的非均匀调制可以实现光子自旋-轨道相互耦合，从而发掘很多新的光学现象，其中Pancharatnam-Berry(PB)相位扮演了至关重要的角色。在偏振转换中，光场的不同偏振分量得到不同的PB相位。利用PB相位对光场偏振分量进行波前整形，以控制光场偏振分量的传输，从而在光场传输过程中实现偏振转换、角动量转化、能流控制等。光场偏振调制的相关研究在自旋选择成像、微粒操控、激光微加工、信息传输与修复中具有潜在的应用价值。分析了偏振调制光场的传输和控制原理，总结了近年来国内外的相关研究工作进展。