Optically sizing single atmospheric particulates with a 10-nm resolution using a strong evanescent field  

作　　者：Xiao-Chong Yu Yanyan Zhi Shui-Jing Tang Bei-Bei Li Qihuang Gong Cheng-Wei Qiu Yun-Feng Xiao 

机构地区：[1]State Key Laboratory for Mesoscopic Physics and School of Physics,Peking University,Beijing 100871,China [2]Collaborative Innovation Center of Quantum Matter,Beijing 100871,China [3]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China [4]Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore [5]NUS Suzhou Research Institute(NUSRI),Suzhou 215123,China [6]SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology,Shenzhen University,Shenzhen 518060,China

出　　处：《Light(Science & Applications)》2018年第1期1087-1093,共7页光（科学与应用)（英文版）

基　　金：supported by the NSFC(Grant Nos.61435001,61611540346,11474011 and 11654003);the National Key R&D Program of China(Grant No.2016YFA0301302);supported by the China Postdoctoral Science Foundation(Grant No.2015M580909).

摘　　要：Although an accurate evaluation of the distribution of ultrafine particulate matter in air is of utmost significance to public health,the usually used PM2.5 index fails to provide size distribution information.Here we demonstrate a low-profile and cavity-free size spectrometer for probing fine and ultrafine particulate matter by using the enhanced particle-perturbed scattering in strong optical evanescent fields of a nanofiber array.The unprecedented size resolution reaches 10 nm for detecting single 100-nm-diameter nanoparticles by employing uniform nanofibers and controlling the polarizations of the probe light.This size spectrometry was tested and used to retrieve the size distribution of particulate matter in the air of Beijing,yielding mass concentrations of nanoparticles,as a secondary exercise,consistent with the officially released data.This nanofiber-array probe shows potential for the full monitoring of air pollution and for studying early-stage haze evolution and can be further extended to explore nanoparticle interactions.

关 键 词：air pollution optical nanofiber single particulates size spectrometer 

分 类 号：TB3[一般工业技术—材料科学与工程]