Direct imaging of photonic nanojets
Direct imaging of photonic nanojets
复制标题
DOI：
10.1364/oe.16.006930
复制
发表时间：
2008-05-12
期刊：
影响因子：
3.8
通讯作者：
Rigneault, Herve
中科院分区：
文献类型：
--
作者：
Ferrand, Patrick;Wenger, Jerome;Rigneault, Herve
我们报告的直接实验观察的光子纳米射流由单一的乳胶微球照射的平面波在520 nm的波长。用快速扫描共聚焦显微镜在检测模式下进行测量，其中检测针孔限定了在微球附近三维扫描的衍射限制观察体积。从收集的图像堆栈，我们重建全三维光子纳米喷射光束。对沉积在玻璃基底上的直径为1、3和5 μ m的聚苯乙烯球进行观察，上层介质为空气或水。实验结果进行了比较，使用米氏理论进行计算。我们测量纳米喷射尺寸小至270 nm的半高宽为3 μ m的球体在波长。520 nm。光束在超过3 λ的传播距离上保持亚波长半高宽，显示出光子纳米喷射的所有特性。(C)2008年美国光学学会。
We report the direct experimental observation of photonic nanojets created by single latex microspheres illuminated by a plane wave at a wavelength of 520 nm. Measurements are performed with a fast scanning confocal microscope in detection mode, where the detection pinhole defines a diffraction- limited observation volume that is scanned in three dimensions over the microsphere vicinity. From the collected stack of images, we reconstruct the full 3 dimensional photonic nanojet beam. Observations are conducted for polystyrene spheres of 1, 3 and 5 mu m diameter deposited on a glass substrate, the upper medium being air or water. Experimental results are compared to calculations performed using the Mie theory. We measure nanojet sizes as small as 270 nm FWHM for a 3 mu m sphere at a wavelength. of 520 nm. The beam keeps a subwavelength FWHM over a propagation distance of more than 3 lambda, displaying all the specificities of a photonic nanojet. (C) 2008 Optical Society of America.