Publications de Justyna Szeszko

Non-centrosymmetric plasmonic crystals for second-harmonic generation with controlled anisotropy and enhancement

Elyahou Kapon, Benjamin Dwir, Justyna Szeszko

Rectangular arrays of pyramidal recesses coated by silver film are investigated by means of polarization-resolved nonlinear microscopy at 900 nm fundamental wavelength, demonstrating strong dependence of the dipole-allowed SHG upon the lattice parameters. ...

Wiley-V C H Verlag Gmbh2016

Parabolic tailored-potential quantum-wires grown in inverted pyramids

Elyahou Kapon, Alok Rudra, Justyna Szeszko, Mikhail Lazarev

Quasi-one-dimensional AlGaAs quantum wires (QWRs) with parabolic heterostructure profiles along their axis were fabricated using metallorganic vapor phase epitaxy (MOVPE) On patterned (111)B GaAs substrates. Tailoring of the confined electronic states via ...

Elsevier Science Bv2015

Multiexciton dynamics in tailored band-gap quasi-one-dimensional systems

Elyahou Kapon, Alok Rudra, Benjamin Dwir, Justyna Szeszko

Optoelectronic properties of site-controlled AlGaAs/GaAs quasi-one-dimensional structures are investigated. Controllable linear variation of the band gap along the vertical axis of the quantum wire, symmetrical with respect to its center, results in a set ...

Amer Physical Soc2015

Effects of surface plasmon polariton-mediated interactions on second harmonic generation from assemblies of pyramidal metallic nano-cavities

Elyahou Kapon, Benjamin Dwir, Justyna Szeszko

We use polarization-resolved two-photon microscopy to investigate second harmonic generation (SHG) from individual assemblies of site-controlled nano-pyramidal recess templates covered with silver films. We demonstrate the effect of the surface plasmon pol ...

Optical Soc Amer2014

Exciton localization and drift in tailored-potential quantum nanowires

Elyahou Kapon, Alok Rudra, Justyna Szeszko

Exciton recombination dynamics in tailored-potential, site-controlled AlGaAs quantum wires (QWRs) are studied. Time-resolved photoluminescence spectra evidence exciton localization in weakly disordered "uniform" QWRs, whereas deterministic bandgap grading ...

American Institute of Physics2014

Quantum Wire - Quantum Dot Systems Grown in Inverted Pyramids

Justyna Szeszko

Semiconductor quantum wires (QWRs) and quantum dots (QDs) are nanoscale heterostructures, which form fascinating low-dimensional systems for fundamental studies of quantum-mechanical effects and are attractive candidates for integration into optoelectronic ...

EPFL2013

Exciton confinement and trapping dynamics in double-graded-bandgap quantum nanowires

Elyahou Kapon, Alok Rudra, Pascal Gallo, Justyna Szeszko

We fabricate and study quantum dot structures incorporating quasi-one-dimensional excited states. The structures are realized by graded bandgap GaAs/AlGaAs quantum wires self-formed inside inverted tetrahedral pyramids. The ground state transitions exhibit ...

American Institute of Physics2012