Experimental observation of hybrid mode of Tamm plasmon-polariton and surface plasmon-polariton is reported. The hybrid state is excited in one-dimensional photonic crystal terminated by semitransparent metal film under conditions of total internal reflection for transverse-magnetic-polarized light. Coupling between Tamm and surface plasmon-polaritons leads to repulsion of their dispersion curves controlled by metal film thickness.
Ultrafast all-optical modulators
are crucial parts of prospective
photonic devices. A number of plasmonic and dielectric nanostructures
were nominated as candidates for integrated all-optical circuits.
The key principle in the design of such devices is to engineer artificial
optical resonances to increase the magnitude of modulation or to change
the characteristic switching time. The major drawback is that the
manufacturing becomes rather sophisticated. Here, we propose a method
to tailor the ultrafast response of photonic crystal–metal
nanostructures by employing a spectral shift of the Tamm-plasmon resonance.
We show that for the absorbed pump fluence of 6 pJ reflectance of
the sample at the near-infrared probe wavelength in the vicinity of
the Tamm-plasmon resonance changes 25× stronger as compared with
a bare metal film. Additionally, we show that by choosing a proper
wavelength around the resonance a background-free reflectance modulation
can be achieved. The characteristic pulse-limited switching time,
in this case, is 150 fs.
Resonant enhancement of second-harmonic generation (SHG) intensity from a thin metal film is demonstrated in a Tamm plasmon-polariton mode excited at a metal/photonic crystal interface using nonlinear spectroscopy. Nonlinear effects enhancement in proposed structures exhibit strong polarization dependence (1:200 for the orthogonal fundamental polarizations). SHG enhancement factor evinces considerable angular dependence, rising from 50 for the 45° angle of incidence to 170 for the 10° angle of incidence. The results are analyzed numerically using a nonlinear transfer matrix technique. The findings elucidate the potential of Tamm plasmon-polaritons in the nonlinear optical applications.
This paper reports on measurements of the lifetime of Tamm plasmon-polaritons (TPPs) excited in a 1D photonic-crystal/thin-metal-film structure. A femtosecond pulse reflected from a structure of this kind is found to be significantly distorted if its spectrum overlaps with the Tamm plasmon resonance. It is shown that the TPP lifetime possesses strong polarization and angular dependence. It varies from 20 fs for p-polarized light to 40 fs for s-polarized light at a 45° angle of incidence. The reported lifetime of Tamm plasmons is several times smaller than the previously reported lifetime of surface plasmons.
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