On the quantitative optical properties of Au nanoparticles embedded in biological tissue phantoms
Abstract
We systematically investigated and quantified how gold (Au) metal nanoparticles (NPs) optical spectra change upon introduction into the biological tissue phantoms environment, in which the AuNPs can agglomerate. Quantitative knowledge of how the AuNPs spectra and plasmon resonance wavelength change inside a phantom environment can provide many in-vitro and in-vivo plasmonic NPs-mediated applications. Because the plasmonic properties of metal NPs are dependent on their size, morphology, concentration, and local environment, tuning the incident photon wavelength may increase the AuNPs plasmonic properties. Plasmonic photothermal therapy and photonic gene circuits are among the many applications. Quantitatively analyzing optical absorption and scattering data, we may observe changes in the resonance peak positions and breadths, related to the distribution of the spherical AuNPs within the chitosan phantoms as a function of the particle size and concentration. The scattered irradiance with the wavelength for embedded AuNPs was registered for the optical scattering mechanisms, decreasing as λ-4 for Rayleigh scattering, and much more slowly for Mie scattering, λ-b, with b in the range of 1-3.
- Publication:
-
Optical Materials
- Pub Date:
- April 2021
- DOI:
- 10.1016/j.optmat.2021.110924
- arXiv:
- arXiv:2006.04584
- Bibcode:
- 2021OptMa.11410924A
- Keywords:
-
- Au nanoparticles;
- Optical absorption;
- Optical scattering;
- Mie and Rayleigh scatterings;
- Optical phantoms;
- Chitosan phantoms;
- Physics - Applied Physics;
- Physics - Optics
- E-Print:
- 17 pages, 3 figures, 1 table