This PDF file includes:

• Supplementary Text
  
• fig. S1. Cavity resonance measurement setup.
  
• fig. S2. Electrostatic calculation of nanoplasmonic enhancement.
  
• fig. S3. Baseline drift.
  
• fig. S4. Step fitting algorithm.
  
• fig. S5. k_on and k_off fitting.
  
• fig. S6. Concentration dependence of DNA-XPA interaction.
  
• table S1. Comparison of Q-factors and mode volumes (V).
  
• References (59–69)

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