Netherlands: Postdoc on the Physics of Nanolasers at Eindhoven University of Technology

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Job description

The group of Prof. Smit in Eindhoven recently demonstrated the first electrically-pumped semiconductor laser with a size much smaller than the wavelength (down to 200 nm) [1]. This work initiated a large worldwide activity on nanolasers, in view of their potential application as ultrasmall and ultralow-power optical sources for photonic interconnects on silicon chips. The nanolasers use metals to ensure confinement on the subwavelength scale and a semiconductor active region to provide sufficient gain for lasing. While several demonstrations of lasing, up to room temperature, have been reported, the underlying physics of such a small laser is not yet understood. Key questions include the effect of modified spontaneous emission rates, the role of spatial hole burning and the modified electron-photon interaction in the limit where the photon is confined on a scale smaller than the electronic wavefunction. These physical effects play a major role in determining the efficiency and modulation speed and their understanding is therefore vital to the design of nanolasers for interconnect applications.

 

Project description

The selected candidate will perform cutting-edge fundamental research on laser physics at an unconventional scale. He/she will first develop a physical model for the dynamic operation of nanolasers, taking into account spontaneous emission enhancement effects in realistic cavities, and explore the ultimate limits in the speed. On the experimental side, ultrasensitive time-resolved measurement techniques developed in our lab will be applied to study the dynamics of the nanolasers fabricated at the EE department. The spontaneous emission dynamics below threshold and the relaxation oscillation dynamics above threshold will be measured and compared to the laser model, enabling the determination of the fundamental device physical parameters such as carrier lifetime, differential gain and gain compression factor. The results will be fed back to the design and fabrication of advanced nanolasers featuring optimized efficiency and speed. The project will be jointly supervised by Profs. A. Fiore (AP) and M.K. Smit (EE)

 

References

[1] Hill et al., Nature Photonics 1, 589 (2007)

Requirements

We welcome applications from candidates with an excellent academic background in Physics or Electrical Engineering and with a PhD degree in optics or photonics Candidates must prove a strong attitude towards experimental physics and the drive and capacity to tackle different aspects of a complex physical problem with large independence.

Conditions of employment

The initial appointment will be for one year, and may be renewed for a maximum total of 2.5 years, in accordance with the Collective Labour Agreement of the Dutch Universities. The University offers an attractive package of fringe benefits such as excellent technical infrastructure, child care, savings schemes and excellent sports facilities.

The salary as usual for a Postdoctoral position in the Netherlands is offered, starting at € 2.919,– gross per month. Moreover you will receive a holiday allowance of 8% and an end of year bonus of 8.3%.

Additional information

  • Prof.dr. A.(Andrea) Fiore
  • Department of Applied Physics
  • Group Photonics and Semiconductor Nanophysics
  • www.phys.tue.nl/psn
  • Technische Universiteit Eindhoven, The Netherlands
  • E-mail; a.fiore@tue.nl

Informal information may be obtained by sending an email message to a.fiore@tue.nl

If interested, please send an application letter, CV, grade listing and names and contact details of at least one senior scientist able and willing to provide references.

Please send us your application by using the ‘apply now button on the TU/e website

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