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Title: Plasmonic Nonlinear Energy Transfer Enhanced Second Harmonic Generation Nanoscopy

Journal Article · · Nano Letters
 [1];  [2];  [3];  [2]; ORCiD logo [3]; ORCiD logo [4]
  1. University of California, Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  2. Inha University, Incheon (Korea, Republic of)
  3. University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  4. University of California, Berkeley, CA (United States)

Nonlinear optical response is a fingerprint of various physicochemical properties of materials related to symmetry, including crystallography, interfacial configuration, and carrier dynamics. However, the intrinsically weak nonlinear optical susceptibility and the diffraction limit of far-field optics restrict probing deep-subwavelength-scale nonlinear optics with measurable signal-to-noise ratio. Here, we propose an alternative approach toward efficient second harmonic generation (SHG) nanoscopy for SHG-active sample (zinc oxide nanowire; ZnO NW) using an SHG-active plasmonic nanotip. Our full-wave simulation suggests that the experimentally observed high near-field SHG contrast is possible when the nonlinear response of ZnO NW is enhanced and/or that of the tip is suppressed. Here, this result suggests possible evidence of quantum mechanical nonlinear energy transfer between the tip and the sample, modifying the nonlinear optical susceptibility. Further, this process probes the nanoscale corrosion of ZnO NW, demonstrating potential use in studying various physicochemical phenomena in nanoscale resolution.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Research Foundation of Korea (NRF)
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231; NRF-2022R1F1A1074019
OSTI ID:
1983743
Report Number(s):
LLNL-JRNL-839029; 1059559
Journal Information:
Nano Letters, Vol. 23, Issue 5; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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