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. 2018 Apr 5;13:2065–2078. doi: 10.2147/IJN.S156347

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© 2018 Yang et al. This work is published and licensed by Dove Medical Press Limited

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(A) Transmission electron microscope micrographs of Au NRs. (B) UV-vis absorption spectra of Au NPs and Au NRs. (C) Simulated extinction spectra of Au NPs and Au NRs through DDA calculation. (D) DDA simulated electric field intensity distribution of Au NPs (upper row) and Au NRs (lower row) at 532 nm, 633 nm, and 785 nm wavelength, respectively.

Notes: The red point and the white arrow are the propagation direction (k vector) and the polarization (E field vector), respectively. The color bar represents the value of |E|. The coordinate directions are as indicated.

Abbreviations: Au NP, gold nanoparticle; Au NR, gold nanoring; DDA, discrete dipole approximation; UV-vis, ultraviolet–visible.