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Two-photon luminescence of plasmonic nanoantennas and superstructures

Supervisor

A/Prof. James W. M. Chon

Project Description

Nanoplasmonics is a new class of research field in optics that utilises electron cloud oscillations in metallic nanostructures to allow strong interactions at optical frequencies. It is anticipated to bridge between Photonics and Electronics, overcoming their inherent limitations in speed and miniaturization. Recent new development in optical nanoantenna structures provide means to control emission directions, using field enhancement and plasmon coupling  [1].

In this project, we propose to study plasmon coupled nanoantenna and superstructures by means of linear and non-linear luminescence spectroscopy, to understand the field enhancement mechanisms and to increase its luminescence quantum efficiency. In particular, the plasmon coupling will be maximised to increase field strength inside the structure. This project will help develop novel non-toxic, highly efficient, linear and nonlinear luminescent markers that are stable and free of blinking/bleaching. Such markers will be great assets for targeted cell imaging, photodynamic cancer therapy, and high density optical storage.

The cutting-edge electron beam lithography platform (Raith II) within the university will be utilised to fabricate the nanoplasmonic elements, and an ultrafast lasers (Spectra Physics, Broad band Ti:Sapphire Tsunami) will be used to excite surface plasmons in the structure. Finite difference time domain simulation package of plasmonic wave propagation (Lumerical package) will also be utilized, with access to supercomputers within the University.

References

  1. A. B. Taylor, A. M. Siddiquee and J. W. M. Chon, “Below melting point photothermal reshaping of single gold nanorods driven by surface diffusion,” ACS Nano, 8 (12), 12071-12079 (2014)
  2. A. B. Taylor, T. T. Y. Chow and J. W. M. Chon, “Alignment of gold nanorods by angular photothermal depletion,”  Appl. Phys. Lett., 104 (12), Art. No. 83118 (2014)
  3. P. Zijlstra, J. W. M. Chon, M. Gu, “White light scattering spectroscopy and electron microscopy of laser induced melting in single gold nanorods,” Phys. Chem. Chem. Phys., 11, 5915 - 5921 (2009)

Contact

A/Prof. James W. M. Chon, Tel: +61 3 9214 4326, email: jchon@swin.edu.au