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Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
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Encrypted information reading technology at the micro/nano scale based on surface plasma-driven reactions.

Xueyan Wang1, Yiyuan Zhang1, Chengpeng Zhao1

  • 1The Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Department of Physics, Capital Normal University, Beijing 100048, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|July 16, 2022
PubMed
Summary

Researchers demonstrate a novel method for encrypted information storage using localized photocatalytic reactions on a gold nanoporous array. This plasmon-driven process allows for real-time, high-fidelity writing and reading of micro/nano-scale data using Raman spectroscopy.

Keywords:
Finite difference time domain (FDTD)Information encryptionPhotocatalytic reactionsSurface enhanced Raman spectroscopy (SERS)Surface plasmon

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Area of Science:

  • Plasmonics
  • Photocatalysis
  • Nanotechnology
  • Spectroscopy

Background:

  • Plasma exciton photocatalysis offers controllable and selective reactions.
  • Surface plasmon resonance enables localized energy transfer for chemical reactions.
  • Raman fingerprinting provides unique molecular identification.

Purpose of the Study:

  • To realize localized photocatalytic reactions for micro/nano-scale encrypted information storage.
  • To utilize Raman spectroscopy for writing and reading encrypted data.
  • To investigate the role of plasmonic hot spots in enhancing photocatalytic efficiency.

Main Methods:

  • Assembling probe molecules (4-nitrobenzenethiol) on a gold nanoporous array.
  • Using a focused Raman spot for micro/nano manipulation to write information via photocatalysis.
  • Employing Raman mapping with a longer excitation wavelength to read the encrypted information.
  • Conducting finite-difference time-domain (FDTD) simulations to analyze hot spot distribution.

Main Results:

  • Successful writing and reading of 2D micro/nano cryptograms through photocatalytic conversion of 4-nitrobenzenethiol to p,p'-dimercaptoazobenzene.
  • Identification of regularly arranged hot spots on the gold nanoporous array as crucial for efficient photocatalysis.
  • Demonstration of real-time, lossless recording and reading of encrypted information.

Conclusions:

  • Localized photocatalytic reactions driven by surface plasmons can be effectively used for micro/nano-scale information storage.
  • Raman spectroscopy, combined with plasmonic nanostructures, offers a powerful tool for high-density data recording and retrieval.
  • This approach holds significant potential for applications in confidential information storage and security.