Table 2.

SPR chip design parameters.

SPR Chip Design Parameters
Substrate (lower cladding) index	1.4450
Guiding layer index	1.4559
Guiding layer thickness	2 µm
Chromium adhesion layer	2 nm
Gold refractive index	0.197 − 3.446i *
Gold pad thickness	35 nm

* i = √−1.