@article{HeydariFlehrStumpe2013,
  author    = {Heydari, Esmaeil and Flehr, Roman and Stumpe, Joachim},
  title     = {Influence of spacer layer on enhancement of nanoplasmon-assisted random lasing},
  series = {Applied physics letters},
  volume    = {102},
  journal   = {Applied physics letters},
  number    = {13},
  publisher = {American Institute of Physics},
  address   = {Melville},
  issn      = {0003-6951},
  doi       = {10.1063/1.4800776},
  pages     = {4},
  year      = {2013},
  abstract  = {Threshold reduction and emission enhancement are reported for a gold nanoparticle-based waveguided random laser, exploiting the localized surface plasmon resonance excitation. It was experimentally found that a proper thickness of the spacer layer between the gold nanoparticles and the gain layer enhances the random laser performance. It tunes the coupling between the gain polymer and the gold nanoparticles and avoids the quenching of emission in close contact to the gold nanoparticles which is considered as one of the main sources of loss in the current laser system. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4800776]},
  language  = {en}
}
@article{HeydariBullerWischerhoffetal.2014,
  author    = {Heydari, Esmaeil and Buller, Jens and Wischerhoff, Erik and Laschewsky, Andr{\´e} and D{\"o}ring, Sebastian and Stumpe, Joachim},
  title     = {Label-Free biosensor based on an all-polymer DFB laser},
  series = {Advanced optical materials},
  volume    = {2},
  journal   = {Advanced optical materials},
  number    = {2},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {2195-1071},
  doi       = {10.1002/adom.201300454},
  pages     = {137 -- 141},
  year      = {2014},
  language  = {en}
}
@article{HeydariPastorizaSantosFlehretal.2013,
  author    = {Heydari, Esmaeil and Pastoriza-Santos, Isabel and Flehr, Roman and Liz-Marzan, Luis M. and Stumpe, Joachim},
  title     = {Nanoplasmonic enhancement of the emission of semiconductor polymer composites},
  series = {The journal of physical chemistry : C, Nanomaterials and interfaces},
  volume    = {117},
  journal   = {The journal of physical chemistry : C, Nanomaterials and interfaces},
  number    = {32},
  publisher = {American Chemical Society},
  address   = {Washington},
  issn      = {1932-7447},
  doi       = {10.1021/jp404068m},
  pages     = {16577 -- 16583},
  year      = {2013},
  abstract  = {We report on the influence of localized surface plasmon resonance excitation of Au@SiO2 core-shell nanoparticles on the amplified spontaneous emission of a semiconductor polymer composite (F8BT/MEH-PPV). Au@SiO2 nanoparticles are compatible with the donor-acceptor polymer matrix and get uniformly distributed within the whole polymer film. The plasmon resonance band of the nanoparticles correlates with both the emission and excitation spectra of the polymer composite, as well as with the donor emission and acceptor excitation spectra. We demonstrate that resonantly excited Au@SiO2 nanoparticles enhance the amplified spontaneous emission and the modal gain of the polymer films. The measurement of influential factors reveals that the emission is enhanced predominantly by the increase of acceptor excitation rate, which is accompanied by depletion of the FRET efficiency and increase of quantum yield. The enhancement factor is increased by both introducing a higher loading of plasmonic nanoparticles in the polymer film and increasing the excitation energy. This work shows that these plasmonic nanoantennas are able to enhance the stimulated emission of semiconductor polymers by improving the size mismatch between the excitation light and the emitting polymer.},
  language  = {en}
}
@article{HeydariPastorizaSantosLizMarzanetal.2017,
  author    = {Heydari, Esmaeil and Pastoriza-Santos, Isabel and Liz-Marzan, Luis M. and Stumpe, Joachim},
  title     = {Nanoplasmonically-engineered random lasing in organic semiconductor thin films},
  series = {Nanoscale horizons},
  volume    = {2},
  journal   = {Nanoscale horizons},
  publisher = {Royal Society of Chemistry},
  address   = {Cambridge},
  issn      = {2055-6756},
  doi       = {10.1039/c7nh00054e},
  pages     = {261 -- 266},
  year      = {2017},
  abstract  = {We demonstrate plasmonically nano-engineered coherent random lasing and stimulated emission enhancement in a hybrid gainmedium of organic semiconductors doped with core-shell plasmonic nanoparticles. The gain medium is composed of a 300 +/- 2 nm thin waveguide of an organic semiconductor, doped with 53 nm gold nanoparticle cores, isolated within silica shells. Upon loading the nanoparticles, the threshold of amplified spontaneous emission is reduced from 1.75 mu J cm(-2) x 10(2) for an undoped gain medium, to 0.35 mu J cm(-2) x 10(2) for a highly concentrated gain medium, and lasing spikes narrower than 0.1 nm are obtained. Most importantly, selection of silica shells with thicknesses of 10, 17 and 21 nm enables engineering of the plasmon-exciton energy coupling and consequently tuning of the laser slope efficiency. With this approach, the slope efficiency is increased by two times by decreasing the silica shell from 21 nm down to 10 nm, due to the enhancement of the localized electric field.},
  language  = {en}
}