Particle manipulation beyond the diffraction limit using structured super-oscillating light beams  

作　　者：Brijesh K Singh Harel Nagar Yael Roichman Ady Arie 

机构地区：[1]School of Electrical Engineering,Fleischman Faculty of Engineering,Tel-Aviv University,Tel Aviv 6997801,Israel [2]Department of Physics,Central University of Rajasthan,Ajmer,Rajasthan 305817,India [3]Raymond and Beverly Sackler School of Chemistry,Tel Aviv University,Tel Aviv 6997801,Israel

出　　处：《Light(Science & Applications)》2017年第1期542-547,共6页光（科学与应用)（英文版）

基　　金：the Israel Science Foundation(ISF)Grant No.(1310/13);Center for Nanoscience and Nanotechnology,Tel Aviv University for their financial support.

摘　　要：The diffraction-limited resolution of light focused by a lens was derived in 1873 by Ernst Abbe.Later in 1952,a method to reach sub-diffraction light spots was proposed by modulating the wavefront of the focused beam.In a related development,super-oscillating functions,that is,band-limited functions that locally oscillate faster than their highest Fourier component,were introduced and experimentally applied for super-resolution microscopy.Up till now,only simple Gaussian-like sub-diffraction spots were used.Here we show that the amplitude and phase profile of these sub-diffraction spots can be arbitrarily controlled.In particular,we utilize Hermite–Gauss,Laguerre–Gauss and Airy functions to structure super-oscillating beams with subdiffraction lobes.These structured beams are then used for high-resolution trapping and manipulation of nanometer-sized particles.The trapping potential provides unprecedented localization accuracy and stiffness,significantly exceeding those provided by standard diffraction-limited beams.

关 键 词：beam shaping optical tweezers optical vortex super-oscillating beams 

分 类 号：O17[理学—数学]