some publications I found that may be of help in developing your experiment.
1. Ermini, M. L., Mariani, S., Scarano, S., et al.; Direct detection of genomic DNA by surface plasmon resonance imaging: An optimized approach. Biosensors and Bioelectronics (40) 1: 193; 2013.
2. Lacy, E. R., Cox, K. K., Wilson, W. D., et al.; Recognition of T small middle dotG mismatched base pairs in DNA by stacked imidazole-containing polyamides: surface plasmon resonance and circular dichroism studies. Nucleic Acids Res. (30) 8: 1834-1841; 2002.
3. Palau, W. and Di Primo, C.; Single-cycle kinetic analysis of ternary DNA complexes by surface plasmon resonance on a decaying surface. Biochimie (94) 9: 1891-1899; 2012.
Arnoud