Objective
The discreet energy spectrum characterizing electron states in quantum dots and photon states in 3D optical micro cavities lead to interesting peculiarities of the properties of the of such states, especially when they interact to each other. The objective is to study fundamental properties of such zero dimensional states, to analyse the possibility of the use of such fundamental effect for the optoelectronics and quantum information processing, develop the technology for the fabrication of such devices and experimentally investigate their properties. In this project we intend to study quantum dots in micro-cavities in a variety of shapes. The interaction of the excitons and the cavity modes will be studied both in the weak coupling regime and the strong coupling regime. An emphasis will be put on spectroscopy and the combination of theory and experiment. The device goal of the project is to construct a working C-NOT quantum gate.
Description of the research activity.
The technology of the growth of quantum dot of improved uniformity will be developed as well as the technology of the growth of quantum dots in the predefined places. Using these technology quantum dot crystals will be fabricated. By etching of the cylindrical trenches or 2D photonic crystals in the planar bragg micro cavity 3D optical micro cavity will be fabricated, and its properties will be studied experimentally and theoretically. In contrast to the micro discs where localized optical modes (whisperings gallery modes) are characterized by large orbital momentum, in 3D micro cavities localized photon states can have orbital momentum as low as one. Micro discs, coupled micro discs and 3D cavities with one two or several quantum dots will be fabricated and an interaction of the photon and exciton states in such object will investigate experimentally and theoretically.
Expected results.
Fabrication of the new type of structures, such as quantum dot crystals, single and coupled microdiscs and 3D cavities with quantum dots. Electron beam lithography combined with selective etching will be used to create micro-discs containing quantum dots in predefined places, including micro-discs containing one or two dots. These dots will be studied using micro-photoluminescence, correlation spectroscopy and time-resolved photoluminescence. Observation of the Purcell effect in the micro discs and 3D cavities with quantum dots. Observation of the interaction of the zero-dimensional exciton and photon states in the weak and strong coupling regime. Measurements of the decoherence time of the excitons in the micro discs with quantum dots and in the coupled micro discs. Observation of the biexciton in the quantum dot in the microdiscs and 3D cavity.
The source of the non-classical light -single photons and entangled photon pairs based on the micro disc or 3D micro cavity with quntum dot. The analysis of the perspective of the use of zero-dimensional electron and photon states in opto-electronics and quantum information processing. We expect to get a strong increase in the knowledge of the coupling between excitons and photons in micro cavities.
The results will be presented under the form of one annual and one Final Project Reports, edited by the Project co-ordinator, and of publications in International Journals and communications in International Conferences, making mention of the support given by the INTAS Program.
Call for proposal
Data not availableFunding Scheme
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63177 Aubière
France