Spatially structured light has opened a wide range of opportunities for enhanced imaging as well as optical manipulation and particle confinement. Here, we show that phase-coherent illumination with superpositions of radial Laguerre–Gauss (LG) beams provides improved localization for bright optical tweezer traps, with narrowed radial and axial intensity distributions. Further, the Gouy phase shifts for sums of tightly focused radial LG fields can be exploited for phase-contrast strategies at the wavelength scale. One example developed here is the suppression of interference fringes from reflection near nanodielectric surfaces, with the promise of improved cold-atom delivery and manipulation.

空间结构化的光为增强成像以及光学操作和粒子限制开辟了广泛的机会。在这里，我们表明，径向拉格-高斯（LG）光束叠加的相干照明可以为明亮的光学镊子阱提供更好的定位，并具有狭窄的径向和轴向强度分布。此外，可以将紧密聚焦的径向LG场总和的Gouy相移用于波长尺度的相衬策略。此处开发的一个示例是抑制纳米电介质表面附近反射引起的干涉条纹，并有望改善冷原子的传递和处理。