Hannover 2010 – wissenschaftliches Programm
Q 60.1: Vortrag
Freitag, 12. März 2010, 10:30–10:45, F 128
Nanophotonic Interactions of Resonant Cesium Atoms with 3D Opal Photonic Crystals — •Pepijn Pinkse1, Philip Harding1, Allard Mosk1, and Willem Vos1,2 — 1Mesa+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands — 2FOM-AMOLF, Amsterdam, The Netherlands
We have introduced hot Cs vapor in a silica opal photonic crystal to observe novel nanophotonic properties. In comparison to dyes and quantum dots, gaseous alkali atoms are better understood and have strong and very narrow resonances ω/dω = 107. As the temperature is increased, we observe shifts of the opals reflectivity peak in excess of 20%, which is attributed to the reduction of the silica to SiOx. This shift tunes the frequency of the photonic bands relative to the near-infrared Cs D1 transition. Simultaneously, the Cs resonances undergo dramatic changes in strength, off-resonance reflectivity, and shape. The results are in good agreement with a transfer-matrix model including the dispersion and absorption of two of the Cs hyperfine transitions.