Is it true that around 70's there was a huge change in theory that describes plasmons (SPP, to be precise)? Recently I stumbled upon an interesting (but old) paper about plasmons. Authors of that paper reported something like "resonance obtained by us occurs at different angle than it should be theoretically and we don't know the reason for that".
When I asked my coworkers about their remarks, they had no idea what that could be, but one of them told me that around 70's or 80's there were some changes in the theory and the experimental results from before that reform may be inconsistent with theory.
Can you tell me when were the most significant changes introduced in past decades?