Browsing School of Physics by Author "RAKOVICH, YURY"
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Highly efficient Forster resonance energy transfer between CdTe nanocrystals and two different dye molecules
DONEGAN, JOHN; RAKOVICH, YURY; BRADLEY, LOUISE; GOUNKO, IOURI (2004)We report highly efficient Forster resonance energy transfer between CdTe nanocrystals and two different dyes, Rhodamine B and Oxazine, where the nanocrystals are mixed with the dyes on top of glass substrates. A faster ... -
Highly efficient Forster resonance energy transfer between CdTe nanocrystals and two different dye molecules
RAKOVICH, YURY (SPIE, 2004) -
Highly emissive CdTe nanowires grown in a phosphate buffer solution: FLIM imaging and spectroscopic studies
GOUNKO, IOURI; RAKOVICH, YURY; DONEGAN, JOHN (2007)We present details on the formation and optical peroperties of CdTe nanowires, which were found to grow in a standard phosphate-buffered solution, including micro-photoluminescence and fluorescence lifetime imaging. -
Highly emissive nanowires grown from CdTe nanocrystals in a phosphate buffer solution
DONEGAN, JOHN; RAKOVICH, YURY (2005)We present details on the CdTe nanowires formation, which were found to grow in a standard physiological phosphate-buffered solution, including in-situ observation of growth with a confocal microscope. The choice of ... -
Influence of Surface Electric Field on Exciton Photoluminescence of CdS: Self-Reversal of Spectral Lines
RAKOVICH, YURY (1995)The structure of luminescence spectra of free excitons in CdS single crystals at T = 77 K is investigated. The dip formation is found in the top part of free A and B exciton resonant peaks of photoluminescence (PL) spectra ... -
Interaction of surface plasmons with CdTe quantum dot excitons
DONEGAN, JOHN; RAKOVICH, YURY; BRADLEY, LOUISE; LUNNEY, JAMES (SPIE, 2005)A 5-fold enhancement in the luminescence of CdTe nanocrystal quantum dots (QDs) is observed when they are placed in proximity to a nanostructured Au film deposited by pulsed laser deposition technique. No enhancement is ... -
Luminescence spectra of quantum size CdS and PbI2 particles in static electric field
RAKOVICH, YURY (Acta Physica Polonica A, 1995) -
Metal surface enhanced emission from CdTe quantum dots
BRADLEY, LOUISE; DONEGAN, JOHN FRANCIS; RAKOVICH, YURY (IEEE, 2005)In this paper the enhancement in emission from CdTe quantum dots (QDs) on Au island film as a function of CdTe-Au distance is reported. The observed enhancement can be partially explained by increased absorption cross ... -
Mode manipulation in small microsphere systems
RAKOVICH, YURY; DONEGAN, JOHN (2008)In this work we demonstrate the possibility of mode manipulation in systems of symmetric photonic molecules formed by placing several microspheres in contact. We observe photonic nanojets that reflect the symmetry of the ... -
Modification of photon states in photonic molecules with semiconductor nanocrystals
RAKOVICH, YURY (Springer, 2005)We report on the coherent coupling of whispering gallery modes (WGM) in a photonic molecule formed from two melamine-formaldehyde spherical microcavities coated with a thin shell of CdTe nanocrystals (NCs). Utilizing ... -
Nanojets and directional emission from symmetric photonic molecules
RAKOVICH, YURY; DONEGAN, JOHN (2007)Symmetric directional emission of light from multisphere photonic molecules is experimentally shown in this work. The photonic molecules are illuminated in the vertical direction with a defocused laser beam. The emission ... -
Off-resonance surface plasmon enhanced spontaneous emission from CdTe quantum dots
BRADLEY, LOUISE; RAKOVICH, YURY; GOUNKO, IOURI (2006)Surface plasmon (SP) enhanced photoluminescence (PL) from CdTe quantum dots (QDs) on monolayers of Au nanoparticles is investigated under both resonant and nonresonant conditions. Enhancement of the QD PL intensity is ... -
Optical phonons in CdS nanocrystals: effects of size, shape and packing density
RAKOVICH, YURY (Material Research Society, 2000) -
Optimisation of the synthesis and modification of CdTe quantum dots for enhanced live cell imaging
RAKOVICH, YURY (Royal Society of Chemistry, 2006)We report the preparation and luminescence enhancement of thioglycolic acid (TGA) stabilised CdTe quantum dots (QDs) for use as live cell imaging tools in THP-1 macrophage cells. Short irradiating times utilising a high ... -
Photonic molecules: A new concept for wavelength tunable optical delay
DONEGAN, JOHN FRANCIS; RAKOVICH, YURY (IEEE, 2005)The paper describes and light propagation modes in coherently coupled spherical microcavities covered with CdTe nanocrystals. We observe a rich new spectrum of resonances due to the lower symmetry of the two coupled ... -
Polarisation distribution for internal conical diffraction and the superposition of zero and first order bessel beams
LUNNEY, JAMES; DONEGAN, JOHN; RAKOVICH, YURY (2008)Internal conical refraction leads to the formation of zero (J0) and first order (J1) Bessel beams in superposition. The (J0) beam retains the input circular polarisation and the (J1) has opposite polarisation but with a ... -
Radiation-pressure-induced mode splitting in a spherical microcavity
RAKOVICH, YURY; DONEGAN, JOHN (2007)In this work, we present a novel method to reveal azimuthal whispering gallery modes (WGMs) in a spherical microcavity coated with a nano-meter thick polyelectrolyte shell and one monolayer of CdTe semiconductor quantum ... -
Raman scattering and Anti-Stokes emission from a single spherical microcavity with a CdTe quantum dot monolayer
RAKOVICH, YURY (American Institute of Physics, 2003)We have studied the Raman and luminescence spectra of a microcavity?quantum dot system consisting of a melamine formaldehyde latex microsphere coated by CdTe colloidal quantum dots. The cavity-induced enhancement of the ... -
Semiconductor nanowires self-assembled from colloidal CdTe nanocrystal building blocks: optical properties and application perspectives
DONEGAN, JOHN; RAKOVICH, YURY (2012)Solution-based self-assembly of quasi-one-dimensional semiconductor nanostructures (nanowires) from quasi-zero-dimensional (quantum dots) colloidal nanocrystal building blocks has proven itself as a powerful and flexible ... -
Spontaneous emission enhancement in a microtube cavity with highly confined optical modes'
DONEGAN, JOHN; PEROVA, TANIA; GOUNKO, IOURI; RAKOVICH, YURY (SPIE, 2007)A detailed study of the photonic modes in microtube cavity of ~ 7-8 ?m outer diameter is presented. We demonstrate a new route to the fabrication of individual microtubes with the maximum length of 200 ?m, using a vacuum ...