metrology | Scholarship for Nigerians and Africans

PhD or Postdoctoral Position in European Metrology Research Programme, Germany: Natural science, engineering science or mathematics

Challenges, e.g. in the fields of climate change, satellite navigation, space research, semiconductor industry, safety and health care, can only be mastered by means of metrology research, as it is an essential element of modern trade and modern communication. Due to this influence, metrology research traditionally has a high priority in many countries. By pooling the competences of the European metrology institutes in a uniform and integrated European metrology research program, socially and economically important tasks of metrology research can be carried out efficiently and across borders. The program opens up approaches to research which could so far not be realised single-handedly by individual institutes.

PTB promotes the professional equality of women and men and is thus especially interested in applications from women.
Within the scope of the official feasibilities, PTB offers flexible part-time work schemes in order to support in particular the compatibility of family and profession.

Scholarship Application Deadline:10 March 2011

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PhD Position Fluorescence Lifetime Microscopy, IGSM, Germany: Metrology in Life Sciences

In bio and food sciences a maximum of information within a cell is required at a minimum of interference, i.e. in vivo research should be performed without disturbing natural processes. In addition, the observations should be quantitative and the gained quantities independent of the applied investigation technique.

We use one-color (1c2p) and two-color-two-photon (2c2p) excitation of laser dyes, NAD(P)H, tryptophan and unlabeled proteins upon excitation around 400 and 800nm using the SHG and fundamental wavelength of a mode locked Ti:Sa femtosecond laser.

In combination with fluorescence lifetime and polarisation measurements this technique is optimal for “in vivo” investigations due to its very good intrinsic 3D resolution, large penetration depth, and especially its independence of fluorescence intensities. Beside the detection of pH or pO2 values, index of diffraction n, or Ca2+ concentrations (with a resolution of 300nm), melanin, NAD(P)H and tryptophan can be directly observed. A discrimination between free and enzyme bound species is possible on a quantitative level without using any calibration procedure. Spores will be analyzed using this technique to get a better understanding of the underlying molecular processes of sporulation.

Scholarship Application Deadline:31 March 2011

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Doctoral Scholarship in GaN-based Single Photon Emitters, Germany: Quantum Metrology

The interest in single-photon-emitters rises continuously since quantum communication based on the polarization of single photons has already been demonstrated. Unfortunately up to now almost all single-photon sources are pumped optically which makes the realization of a widespread communication network very complex.

For this reason it would be of great advantage to fabricate electrically pumped single-photon-sources. This can be realized e. g. by fabricating LED structures with active regions, where only single ions are incorporated, leading to single photon emission. The LEDs could be driven electrically and the optical energy of the LED is transferred to the single transition available in the active region of the LED. Today, only very few reports on electrical single photon sources are available.

Zinc is a very promising candidate as a single photon emitter in GaN based LEDs. Zn acceptors show efficient emission in the blue spectral range. Zn creates a deep acceptor level 0.3 eV – 0.4 eV above the valence band. Furthermore, Silicon-codoping is required for efficient optical emission, resulting in a very bright photo-luminescence at 2.9 eV (~ 430 nm) which has been assigned to donor-acceptor (DA) transitions.

The goal of this thesis is to investigate single transitions in GaN based LEDs with Zn and Si co-doping. LEDs will be fabricated by MOCVD and processed in house. A thorough analysis of the relevant optical transitions by time resolved optical characterization will allow to get information on the nature and characteristics of the transitions, as well as on the emission statistics in order to get a quantitative handle on the statistical quality of single photon emission correlated with that.

Scholarship Application Deadline: 31 March 2011

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