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The photo-Dember effect is a source of impulsive THz emission following femtosecond pulsed optical excitation. This emission results from the ultrafast spatial separation of electron-hole pairs in strong carrier gradients due to their different diffusion coefficients. The associated time dependent polarization is oriented perpendicular to the excited… (More)
The use of organic optoelectronic devices such as organic light-emitting diodes and organic photodiodes in micro-optical systems is discussed. Potential applications like optical interconnects and optical sensor systems are examined. Device characteristics including emission spectra, I-V-curves and the dynamic behaviour are analysed. In the combination with… (More)
The integration of organic semiconductor distributed feedback (DFB) laser sources into all-polymer chips is promising for biomedical or chemical analysis. However, the fabrication of DFB corrugations is often expensive and time-consuming. Here, we apply the method of laser-assisted replication using a near-infrared diode laser beam to efficiently fabricate… (More)
We have realized a 76 MHz white-light differential transmission spectroscopy system. The technique employs a Ti:sapphire laser oscillator and a tapered fiber to generate a white-light continuum spanning almost the full visible to near-infrared spectral range. Using acousto-optical modulation and subsequent lock-in detection, transient relative transmission… (More)
Lasing mechanisms in organic photonic crystal lasers with two-dimensional distributed feedback, Lasing action in two-dimensional photonic crystal lasers with hexagonal symmetry, Shrinkage precompensation of holographic three-dimensional photonic-crystal templates, Transition between corrugated metal films and split-ring-resonator arrays, Appl. Fabrication… (More)
" Organic semiconductor lasers as integrated light sources for optical sensors " , in: 2.) U. Lemmer and E. O. Göbel, "Photoluminescence spectroscopy as a probe for disorder and excitonic effects in organic and inorganic semiconductors", in: Nature of the primary photoexcitation in conjugated polymers, N.
We present design considerations for semi-transparent organic tandem solar cells that exhibit both good visible transparency and good power conversion efficiencies. The tandem solar cells show excellent color properties, such as the corresponding transparency color temperature and the color rendering index (CRI), that prevail for high angles of incidence of… (More)
Optical data link employing organic light-emitting diodes and organic photodiodes as optoelectronic components, circuit board encapsulation and integration of high-speed polymer photodiodes, Influence of temperature-dependent mobilities on the nanosecond response of organic solar cells and photodetectors, Appl. Highly localized non-linear optical… (More)
We demonstrate that nanowire waveguides with nanoscale precision and ultra-smooth sidewalls can be fabricated with conventional optical lithography. The presented fabrication scheme exploits the combination of a special staggered lithographic design and preferential wet etching.