Tammplasmon-polaritons:Firstexperimentalobservation

a b s t r a c t WereportonthefirstexperimentalobservationofTammplasmon- polaritons (TPP) formed at the interface between a metal and a dielectric Bragg reflector (DBR). Contrary to conventional surface plasmons, TPPs have an in-plane wave vector less than the wave vector of light in vacuum, which allows for their direct optical