Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 37: Photonische Kristalle I

HL 37.9: Talk

Monday, March 7, 2005, 12:00–12:15, TU P270

Trapping and manipulating dielectric nanoparticles on Photonic Crystals using an optical tweezer — •Oliver Benson and Franz Boczianowski — Humboldt-Universität zu Berlin

We perform a controlled experiment where we manipulate sub-micron particles (polystyrene beads and single cells) on Photonic Crystal (PC) structures in aqueous solution with an optical tweezer. The goal of the experiment is to investigate the potential of PC structures for (bio-)sensing applications. We introduce the setup and report on first tests where we trapped and manipulated dielectric particles from 10 µm down to 50 nm. The smaller particles were doped with dye molecules in order to establish optical detection and imaging via their fluorescence light. Additionally, we trapped biological specimen, such as single yeast and blood cells. As a very important result we could demonstrate that it is possible to trap and manipulate 500 nm particles close to the surface of a silicon PC structure which was immersed in water. The results are very promising for future experiments aiming towards sensing and ultra-sensitive force as will be discussed in this talk.