Positioning spherical nanoantennas with picometer precision  

作　　者：HAIXIANG MA FU FENG JIE QIAO JIAAN GAN XIAOCONG YUAN 

机构地区：[1]Research Center for Frontier Fundamental Studies,Zhejiang Lab,Hangzhou 311100,China [2]State Key Laboratory of Extreme Photonics and Instrumentation,College of Optical Science and Engineering,Zhejiang University,Hangzhou 310058,China [3]Institute of Modern Optics,Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology,Nankai University,Tianjin 300350,China [4]Nanophotonics Research Center,Institute of Microscale Optoelectronics&State Key Laboratory of Radio Frequency Heterogeneous Integration,Shenzhen University,Shenzhen 518061,China

出　　处：《Photonics Research》2025年第1期49-58,共10页光子学研究(英文版)

基　　金：National Natural Science Foundation of China(12304330,62275167,61905147,62205215,92250304);Guangdong Major Project of Basic and Applied Basic Research(2020B0301030009);Shenzhen University 2035 Initiative(2023B004);Key R&D Program of Zhejiang(2024SSYS0014,3000-3AA240100);China Postdoctoral Science Foundation(2022M722906);Natural Science Foundation of Zhejiang Province(LQ23F050009,LQ24F050014);Open Research Fund of the State Key Laboratory of Extreme Photonics and Instrumentation Zhejiang University.

摘　　要：Accurate positioning of nanoantennas is critical for their efficient excitation and integration.However,since nanoantennas are subwavelength nanoparticles,normally smaller than the diffraction limit,measuring their positions presents a significant challenge.This is particularly true for locating the nanoantenna along the z-direction,for which no suitable method currently exists.Here,we have theoretically developed and experimentally validated a novel light field capable of measuring the 3D positions of nanoantennas accurately.This field’s polarization chirality transitions from right-handed to left-handed along a predefined 3D direction at a subwavelength scale.For a spherical single-element nanoantenna,the polarization components of the scattering field change significantly as the nanoantenna moves,due to the rapid polarization transformation in the excitation light field.By analyzing the polarization components of the scattering field,we can achieve positional accuracy of the nanoantenna along the specified direction close to 20 pm.This work improves the accuracy of transversely distinguishing nanoantennas from 100 pm in conventional methods to 20 pm.Moreover,the positioning of the nanoantenna along three dimensions is all available as polarization transitions can be predefined along arbitrary 3D direction,which is significant for precision measurement and nanoscale optics.

关 键 词：FIELD SPHERICAL EXCITATION 

分 类 号：TN820[电子电信—信息与通信工程]