Institut Fresnel, CNRS UMR 7249, Aix-Marseille Université, Ecole Centrale Marseille, Marseille, France.
Opt Lett. 2012 Sep 1;37(17):3531-3. doi: 10.1364/OL.37.003531.
A wavefront sensor is used as a direct observation tool to image the Gouy phase shift in photonic nanojets created by micrometer-sized dielectric spheres. The amplitude and phase distributions of light are found in good agreement with a rigorous electromagnetic computation. Interestingly the observed phase shift when travelling through the photonic jet is a combination of the awaited π Gouy shift and a phase shift induced by the bead refraction. Such direct spatial phase shift observation using wavefront sensors would find applications in microscopy, diffractive optics, optical trapping, and point spread function engineering.
波前传感器可用作直接观察工具，用于对由微尺寸介电球体产生的光子纳米射流中的古斯相位位移进行成像。光的振幅和相位分布与严格的电磁计算吻合良好。有趣的是，当光穿过光子射流时，观察到的相位位移是预期的π 古斯位移和由珠子折射引起的相位位移的组合。使用波前传感器进行这种直接的空间相位位移观察将在显微镜、衍射光学、光俘获和点扩散函数工程中得到应用。
