FG Nichtlineare Optik

5 Items

Recent Submissions
Size-dependent exciton substructure in CdSe nanoplatelets and its relation to photoluminescence dynamics

Specht, Judith F. ; Scott, Riccardo ; Castro, Marta Corona ; Christodoulou, Sotirios ; Bertrand, Guillaume H. V. ; Prudnikau, Anatol V. ; Antanovich, Artsiom ; Siebbeles, Laurens D. A. ; Owschimikow, Nina ; Moreels, Iwan ; Artemyev, Mikhail ; Woggon, Ulrike ; Achtstein, Alexander W. ; Richter, Marten (2019-06-12)

CdSe nanoplatelets can be synthesized with different lateral sizes; very small nanoplatelets have almost quantum dot like features (almost discrete exciton states), while very large ones are expected to have properties of colloidal quantum wells (exciton continuum). However, nanoplatelets can be in an intermediate confinement regime with a rich substructure of excitons, which is neither quantum...

Broadband ultrafast spectroscopy on mixed–dimensional InAs/GaAs systems

Kolarczik, Mirco (2019)

This thesis deals with light matter interaction and electron dynamics in coupled systems of nanostructured III-V semiconductors, particularly with quantum dots embedded in quantum wells. Its focus is on the role of dimensionality and the characterization of quantum dot states with respect to their two- and many-level nature. The sample under investigation is a semiconductor optical amplifier un...

A comparative study demonstrates strong size tunability of carrier–phonon coupling in CdSe-based 2D and 0D nanocrystals

Scott, Riccardo ; Prudnikau, Anatol V. ; Antanovich, Artsiom ; Christodoulou, Sotirios ; Riedl, Thomas ; Bertrand, Guillaume H. V. ; Owschimikow, Nina ; Lindner, Jörg K. N. ; Hens, Zeger ; Moreels, Iwan ; Artemyev, Mikhail ; Woggon, Ulrike ; Achtstein, Alexander W. (2019-01-30)

In a comparative study we investigate the carrier–phonon coupling in CdSe based core-only and hetero 2D as well as 0D nanoparticles. We demonstrate that the coupling can be strongly tuned by the lateral size of nanoplatelets, while, due to the weak lateral confinement, the transition energies are only altered by tens of meV. Our analysis shows that an increase in the lateral platelet area resul...

Colloidal synthesis and optical properties of type-II CdSe-CdTe and inverted CdTe-CdSe core-wing heteronanoplatelets

Antanovich, Artsiom ; Prudnikau, Anatol ; Melnikau, Dimitry ; Rakovich, Yury P. ; Chuvilin, Andrey ; Woggon, Ulrike ; Achtstein, Alexander W. ; Artemyev, Mikhail (2015)

We developed colloidal synthesis to investigate the structural and electronic properties of CdSe-CdTe and inverted CdTe-CdSe heteronanoplatelets and experimentally demonstrate that the overgrowth of cadmium selenide or cadmium telluride core nanoplatelets with counterpartner chalcogenide wings leads to type-II heteronanoplatelets with emission energies defined by the bandgaps of the CdSe and Cd...

Temperature dependent radiative and non-radiative recombination dynamics in CdSe-CdTe and CdTe-CdSe type II hetero nanoplatelets

Scott, Riccardo ; Kickhöfel, Sebastian ; Schöps, Oliver ; Antanovich, Artsiom ; Prudnikau, Anatol ; Chuvilin, Andrey ; Woggon, Ulrike ; Artemyev, Mikhail ; Achtstein, Alexander W. (2016)

We investigate the temperature-dependent decay kinetics of type II CdSe-CdTe and CdTe-CdSe core-lateral shell nanoplatelets. From a kinetic analysis of the photoluminescence (PL) decay and a measurement of the temperature dependent quantum yield we deduce the temperature dependence of the non-radiative and radiative lifetimes of hetero nanoplates. In line with the predictions of the giant oscil...