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Title: Direct measurement of optical force induced by near-field plasmonic cavity using dynamic mode AFM

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep16216· OSTI ID:1265939
 [1];  [2];  [3];  [4];  [5];  [1];  [1];  [1]
  1. Hong Kong Univ. of Science & Technology, Kowloon (Hong Kong)
  2. Soochow Univ., Suzhou (China)
  3. Hong Kong Univ. of Science & Technology, Kowloon (Hong Kong); Univ. of Florida, Gainesville, FL (United States)
  4. Nanjing Univ., Nanjing (China)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Plasmonic nanostructures have attracted much attention in recent years because of their potential applications in optical manipulation through near-field enhancement. Continuing experimental efforts have been made to develop accurate techniques to directly measure the near-field optical force induced by the plasmonic nanostructures in the visible frequency range. In this work, we report a new application of dynamic mode atomic force microscopy (DM-AFM) in the measurement of the enhanced optical force acting on a nano-structured plasmonic resonant cavity. The plasmonic cavity is made of an upper gold-coated glass sphere and a lower quartz substrate patterned with an array of subwavelength gold disks. In the near-field when the sphere is positioned close to the disk array, plasmonic resonance is excited in the cavity and the induced force by a 1550 nm infrared laser is found to be increased by an order of magnitude compared with the photon pressure generated by the same laser light. Lastly, the experiment demonstrates that DM-AFM is a powerful tool for the study of light induced forces and their enhancement in plasmonic nanostructures.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265939
Journal Information:
Scientific Reports, Vol. 5; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (3)

Anomalous geometric spin Hall effect of light journal June 2019
Thermally Limited Force Microscopy on Optically Trapped Single Metallic Nanoparticles journal March 2019
Anomalous Geometric Spin Hall Effect of Light? text January 2018

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