This project aims at the demonstration of two novel types of electrically-pumped nanophotonic semiconductor devices with large practical and scientific interest and high degree of innovation, namely, the polariton light emitting devices (LEDs and lasers), and the quantum dot (QD) based single photon sources operating at room temperature. These devices share common fabrication technology and depend both on controlling light-matter interaction inside microcavities and nanostructures. Aside from their fundamental interest, the polariton LEDs and lasers present a number of practical advantages for optoelectronic applications. For instance, a polariton laser is able to operate with a 100 times lower threshold current compared to conventional laser diodes. Up to now, polariton lasing has been demonstrated only in optical injection schemes. Recently however, we have demonstrated in a Nature publication an electrically pumped GaAs polariton LED device operating at 240K, highlighting the potential of such devices for real-world room temperature polaritonics.

This project aspires to build upon these early pioneering results, and has set as ultimate objective the first demonstration of an electrically pumped polariton laser. The QD-based single photon sources (SPS) are crucial components for quantum cryptography and quantum computing applications due to their high repetition rates and mono-photonic purity. Up to date, all InAs QD-based SPS reported in the literature operate at T<77K.

In this project, we will develop the first QD-based SPS operating at room temperature. This will be achieved by exploiting the large piezoelectric (PZ) field inside InAs QDs grown along the (211)B orientation, a QD system on which the consortium has large experience. The PZ field increases the spectral separation between the exciton and multi-exciton emission lines, to values larger than their natural linewidths at elevated temperatures, allowing thus for SPS operation up to 300K.

Project info

Coordinating Institution:
University of Crete
Scientific Coordinator:
Pelekanos Nikolaos
Research Team 2 Leader:
Savvidis Pavlos
Research Team 3 Leader:
Kehagias Thomas


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