Project/scholarship details
- Project/scholarship ID
113199
- Reference
PTDC/FIS/113199/2009
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
5876-PPCDTI
- Funding amount
141,247.00 €
- Start date
2011-02-01
- End date
2014-07-31
Documents
Exciton states in free-standing and embedded semiconductor nanocrystals
Núñez Fernández, Yuriel; Vasilevskiy, Mikhail; Larramendi, Erik; Trallero-Giner, CarlosSemiconductor quantum dots (QDs), often referred to as "artificial atoms", have discrete energy levels that can be tuned by changing the QD size and shape. The existence of zero-dimensional states in QDs has been proved by high spectrally and spatially resolved photoluminescence (PL) studies Empedocles et al. (1996); Grundmann et al. (1995). Semiconductor QDs can be divided into two types, (1) epitaxially grown...
Probing spatial correlations in a system of polarizable nanoparticles via measu...
Pereira, Rui M. S.; Pereira, Paulo; Smirnov, Georgi; Vasilevskiy, MikhailIt is shown that quantitative information on spatial correlations in a system of polarizable particles can be extracted directly from its experimentally measurable optical spectra. For a collection of metallic nanoparticles (NPs), it is demonstrated that the degree of shortrange correlation in NP’s positions can be evaluated by an appropriate numerical analysis of the extinction spectrum in the surface plasmon ...
Synthesis, characterization, energy transfer and binding properties of quantum ...
Bernardo, César Rui de FreitasDissertação de mestrado em Química Medicinal; Colloidal Quantum Dots (QDs) are promising systems for optoelectronic and biotechnology applications, since they have a higher photostability compared to classical fluorophores and their absorption and emission properties can be tuned during synthesis. Among the numerous alternative nanometer building blocks, colloidal QDs are of particular interest in the formation...
A soft method for the production of CdSe and CdSe/ZnS quantum dots
Coutinho, Paulo J. G.Comunicação Oral Convidada.; A soft method for the production of CdSe and CdSe/Zns quantum dots is presented, as well as the main experimental results.; Fundação para a Ciência e a Tecnologia (FCT), FEDER and QREN for financial support to CFUM [Strategic Project PEst-C/FIS/UI0607/2011 (F-COMP-01-0124-FEDER-022711)] and to the research project PTDC/FIS/113199/2009 also financed by COMPETE/QREN/EU.
Excited states of exciton-polariton condensates in 2D and 1D harmonic traps
Trallero-Giner, Carlos; Durnev, M. V.; Núñez Fernández, Yuriel; Vasilevskiy, Mikhail; López-Richard, V.; Kavokin, AlexeyWe present a theoretical description of Bogolyubov-type excitations of exciton-polariton Bose-Einstein condensates (BECs) in semiconductor microcavities. For a typical two-dimensional (2D) BEC we focus on two limiting cases, the weak-and strong-coupling regimes, where a perturbation theory and the Thomas-Fermi approximation, respectively, are valid. We calculate integrated scattering intensity spectra for probi...
A versatile fluorescence lifetime imaging system for scanning large areas with ...
Bernardo, César; Belsley, M.; Gomes, E. Matos; Gonçalves, Hugo; Isakov, Dmitry; Liebold, Falk; Pereira, E. N. B.; Pires, Vladimiro; Samantilleke, A. P."Published in SPIE Proceedings Vol. 9286"; We present a flexible fluorescence lifetime imaging device which can be employed to scan large sample areas with a spatial resolution adjustable from many micrometers down to sub-micrometers and a temporal resolution of 20 picoseconds. Several different applications of the system will be presented including protein microarrays analysis, the scanning of historical sampl...
Optical conductivity of ABA stacked graphene trilayer : mid-IR resonance due to...
Rashidian, Zeinab; Bludov, Yuliy V.; Ribeiro, R. M.; Peres, N. M. R.; Vasilevskiy, MikhailThe band structure and the optical conductivity of an ABA (Bernal-type) stacked graphene trilayer are calculated. It is shown that, under appropriate doping, a strong resonant peak develops in the optical conductivity, located at the frequency corresponding to approximately 1.4 times the interlayer hopping energy and caused by the 'nesting' of two nearly parabolic bands in the electronic spectrum. The intensity...
Effect of clustering on the surface plasmon band in thin films of metallic nano...
Pereira, Rui M. S.; Borges, Joel; Peres, Filipa Cavaco Reis; Pereira, Paulo A.; Smirnov, Georgi; Vaz, F.; Cavaleiro, Albano; Vasilevskiy, MikhailWe theoretically investigate the optical response of ensembles of polarizable metallic nanoparticles (NPs) that form (1) submonolayer films of particles adsorbed on a dielectric substrate, considered as two-dimensional (2-D) systems, and (2) thin three-dimensional (3-D) films, where NPs are embedded in a dielectric matrix. For system (1), the effect of NPs’ distance to the substrate is taken into account. In bo...
Effect of surface plasmon resonance in TiO2/Au thin films on the fluorescence o...
Moura, I.; Cerqueira, M. F.; Melnikau, D.; Savateeva, D.; Rakovich, Y.; Borges, J.; Vaz, F.; Vasilevskiy, MikhailThe exceptional properties of localised surface plasmons (LSPs), such as local field enhancement and confinement effects, resonant behavior, make them ideal candidates to control the emission of luminescent nanoparticles. In the present work, we investigated the LSP effect on the steady-state and time-resolved emission properties of quantum dots (QDs) by organizing the dots into self-assembled dendrite structur...
Energy transfer via exciton transport in quantum dot based self-assembled super...
Bernardo, César Rui Freitas; Belsley, M.; Coutinho, Paulo J. G.; Schellenberg, Peter Michael; Moura, Isabel; Núñez Fernández, YurielWe fabricated dendrite-type superstructures of fractal dimension consisting of CdSe/ZnS & CdTe capped nanodots. These structures were studied using microscopic fluorescence intensity imaging as well as spectral and lifetime mapping.; FCT Concurso "Ciência 2007"; MAP-Fis Doctoral Programme (Doutoramento FCT); info:eu-repo/semantics/publishedVersion
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