How does the SPR peak respond to change in thickness when the layer absorbs light?

The animation above shows what happens to SPR curve when nanolayer thickness is increased and the nanolayer is light absorbing (i.e. has a complex refractive index). The SPR curve peak starts diminishing (moving upwards) upon thickness increase of e.g. metal layers. 

On use of this animation: Feel free to use this animation for educational purposes. Please, remember to refer to the original source, e.g. www.bionavis.com, BioNavis Ltd - Excellence in Surface Plasmon Resonance, Finland. If you are our customer, remember to request a complementary set of PowerPoint slides about the MP-SPR technology.


See also other animations that explain the SPR curve changes in relation to nanolayer thickness and refractive index change:

How does the SPR peak respond to layer thickness change in thickness in air?

 

Thick_layers.png

Measure of thick samples (waveguide effect). Thickness up to few micrometers (with light nonabsorbing samples) can be measured. See animation.

How does the SPR peak respond to change in thickness in water?                                                                   

 

2wavelengths.png

Surface measured with two different wavelengths (here 785 nm and 670 nm). The thickness remains the same in both cases. The difference in the curves is due to the change of refractive index in relation to the measured wavelength. See animation