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A) Extinction profile of Au nanorods with aspect ratios from 2.7. The strong long wavelength band in the near-infrared region (λLPR = 680 nm) is due to the longitudinal oscillation of the conduction band electrons. The short wavelength peak (λ≈520 nm) is from the nanorods' transverse plasmon mode. B) TEM image of nanorods of average aspect ratios (σ) ≈ 2.7
