سال انتشار: ۱۳۸۷

محل انتشار: دومین کنگره بین المللی علوم و فناوری نانو

تعداد صفحات: ۲

نویسنده(ها):

A Daraei – Department of Physics, Faculty of Science, University of Sistan & Baluchestan
M. S. Skolnick – Department of Physics and Astronomy, University of Sheffield, Sheffield

چکیده:

Controlling interaction of light with matter in a microcavity allows one to tune important properties of solids like e.g. the spontaneous emission rate or the spontaneous emission coupling factor into a laser mode [1-3]. Light-matter interaction effects could be investigated in semiconductors using quantum dot (QD) embedded in microcavity pillars (MCPs) [4]. Due to the three dimensional electronic confinement, the QDs excitons can be considered as the solid state equivalent of atom-like emitters [5]. The three dimensional optical mode confinement in the MCPs results in discrete photonic modes [4]. The energies of the QD excitons can be tuned e.g. by using dots of different sizes or by studying QD excitons at different temperatures, whereas the energies of the photonic modes are usually varied via the diameter of the MCPs. By decreasing mode volume the maximum field strength due to a single photon in the microcavities increases. Thus, QD MCPs could be used to study systems with individual QD excitons on and off resonance with photonic modes [6].The advantages of MCPs relative to other microcavities are that the light emerges in the normal direction to the top in a narrow solid angle (<12° for the fundamental mode in 1 μm diameter pillar). Also, it is relatively straightforward to isolate a single quantum dot in a pillar spectrally and spatially by reducing the density of QDs and shrinking lateral size of MCPs. However, in order to observe cavity quantum electrodynamics phenomena such as strong coupling with a single QD exciton or single QD lasing in these structures, a number of design and fabrication issues have to be addressed [7,8].In this article, we report results from temperature dependence photoluminescence (PL) experiments on the MCPs with circular and elliptical cross section. We present single QDs PL spectroscopy and coupling single QDs to a single highly polarized photonic mode