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Title: Probing Gap Plasmons Down to Subnanometer Scales Using Collapsible Nanofingers

Gap plasmonic nanostructures are of great interest due to their ability to concentrate light into small volumes. Theoretical studies, considering quantum mechanical effects, have predicted the optimal spatial gap between adjacent nanoparticles to be in the subnanometer regime in order to achieve the strongest possible field enhancement. In this paper, we present a technology to fabricate gap plasmonic structures with subnanometer resolution, high reliability, and high throughput using collapsible nanofingers. This approach enables us to systematically investigate the effects of gap size and tunneling barrier height. Finally, the experimental results are consistent with previous findings as well as with a straightforward theoretical model that is presented here.
ORCiD logo [1] ; ORCiD logo [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [1] ; ORCiD logo [4] ;  [4] ;  [2] ;  [1]
  1. Univ. of Southern California, Los Angeles, CA (United States). Ming Hsieh Dept. of Electrical Engineering
  2. Univ. of Southern California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
  3. Zhejiang Univ. of Technology, Hangzhou (China). Dept. of Applied Physics
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
Publication Date:
Grant/Contract Number:
FG02-05ER46240; AC02-05CH11231; CMMI-1635612; FA9550-15-1-0184; 11574270; LY15A040005
Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 11; Journal Issue: 6; Journal ID: ISSN 1936-0851
American Chemical Society (ACS)
Research Org:
Univ. of Southern California, Los Angeles, CA (United States); Zhejiang Univ. of Technology, Hangzhou (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); National Natural Science Foundation of China (NNSFC); Natural Science Foundation of Zhejiang Province (China)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; gap plasmon; nanofingers; nanoimprint lithography; plasmonics; quantum effects
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1435089