Abstract
Ultrasensitive to nanogaps: Raman scattering from pairs of silver nanoparticles bound together by hemoglobin varies strongly with incident polarization. Experiments and electrodynamic calculations (see graphic) show that only that part of the incident field that is polarized parallel to the dimer axis generates intense surface-enhanced Raman scattering (SERS). The results support the idea that nanogaps between particles are a key ingredient of ultrasensitive SERS analysis.
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