Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 3: Plasmonics and nanooptics I
O 3.3: Vortrag
Montag, 26. März 2012, 11:00–11:15, MA 005
Adiabatic nanofocusing of ultrashort light pulses. — •Slawa Schmidt1, Björn Piglosiewicz1, Diyar Sadiq1, Javid Shirdel1, Jae Sung Lee2, Parinda Vasa1, Namkyoo Park2, Dai-Sik Kim3, and Christoph Lienau1 — 1Institut für Physik, Carl von Ossietzky Universität, Oldenburg, Germany — 2Photonic System Laboratory, School of EECS, Seoul, Korea — 3Center for Subwavelength Optics and Department of Physics and Astronomy, Seoul, Korea
We demonstrate the use of a novel ultrasharp and ultrasmooth single-crystalline gold taper for adiabatic nanofocusing of few-cycle light pulses. We show that the grating-induced launching of spectrally broadband surface plasmon polariton wavepackets onto the shaft of such a taper generates isolated, point-like light spots with 10 femtosecond duration and sub-10-nm diameter at its very apex. This nanofocusing is so efficient that nano-localized electric fields exceeding the atomic field are reached with conventional high-repetition rate laser oscillators. Strong optical nonlinearities are induced at the tip end and we use here the resulting second harmonic to fully characterize the time structure of the localized electric field in frequency-resolved interferometric autocorrelation measurements. The conclusions drawn from our experiments are beautifully confirmed by numerical simulation based on the finite-difference time-domain (FDTD) method. Our results strongly suggest that these nanometer-sized ultrashort, light spots will enable new experiments probing the dynamics of optical excitations of individual metallic, semiconducting and magnetic nano-structures.