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Focusing light beyond the diffraction limit is of great interest in photonics. Metallic nano-tips offer the ability to concentrate light in nanometric volumes on femtosecond timescales, facilitating applications in tip-enhanced Raman scattering, optical near field microscopy or ultrafast photoemission. Here, we report the spatial mapping of surface plasmon polaritons on conical gold nano-tips by electron...
We present metamaterials consisting of a combination of cut-wire pairs as ldquomagnetic atomsrdquo and a diluted metal. Our experiments reveal a negative refractive index at 1.4 mum wavelength, with a transmittance exceeding 50%.
We present ultrafast two-color pump-probe experiments on silicon inverse opals. A transient blue-shift of the stopgap leads to transmission changes up to a factor of five with relaxation times about 5 ps.
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