Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: POSTERS Electronic and Optical Properties
CPP 40.7: Poster
Donnerstag, 26. März 2009, 17:00–19:30, P3
A tunable subwavelength microresonator design for investigation of single quantum emitters — •Raphael Gutbrod1, Alexey Chizhik1, Anna Chizhik1, Dmitry Khoptyar2, and Alfred J. Meixner1 — 1Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany — 2Department of Physics, Lund University, Box 118, S-221 00 Lund, Sweden
Optical microresonators are structures which confine light to a small volume in the range of one wavelength. Our system is based on a Fabry-Perot λ/2-microresonator and can be reversibly tuned across the whole visible spectral range. This has great potential for intra-cavity studies and can be used to modify the optical properties of a definite single quantum emitter. We present here experimental and theoretical results on modification of the fluorescence emission spectrum as well as the spontaneous emission rate of a single molecule embedded in the microresonator. Additionally, a single fluorescent bead is used to probe the change of the intra-cavity excitation field during resonator tuning. We use radially and azimuthally polarized doughnut mode laser beams for excitation and compare the result with calculated patterns. These beams show an excitation pattern which has distinct features in different parts of the microresonator. This allows us to determine the position of the fluorescent bead with an accuracy of a few nanometres. Furthermore, we also use these beams to determine the orientation of single molecules in the microresonator.