Skip to main content

Polariton Lasers and Amplifiers

Objective

We aim to break new ground in the science and technology of semiconductor light emitters. We focus on Gallium Nitride (GaN) based semiconductor microcavities (MCs) in which excitons and photons are strongly coupled to form exciton-polariton coupled modes, to fabricate coherent light emitters and parametric amplifiers (OPA), with major advantages over present technologies. The particular goals are: 1. Design, fabricate and test the first polariton laser - the demonstration of this new coherent light source would represent a major breakthrough with implications for both pure and applied science. We target both optically and electrically pumped devices at room temperature. 2. In very similar structures demonstrate ultrafast optical parametric amplifier (OPA) operation in compact micron size devices. The high exciton binding energies and large oscillator strengths of GaN provide the materials properties to achieve our goals. At the same time GaN MC technology is in its infancy and poses a number of challenges we are well placed to overcome. Although GaN devices are efficient light emitters, they have high thresholds for inversion due to the high carrier densities of states. MCs in the strong coupling regime overcome this intrinsic limitation, with up to 4 orders of magnitude lower density of states. Stimulation is thus much easier to attain, with the promise of low thresholds for coherent emission, an order of magnitude lower than present GaN lasers. Our goals require advanced crystal growth, device fabrication, spectroscopy, theory and device modelling, beyond the capabilities of any one laboratory. We have assembled a collaboration from leading laboratories around Europe, with the necessary expertise. Success will enable EU scientists, many of whom have pioneered the field, to achieve a real lead on an international scale. Our findings will also have wide applicability to other GaN-devices e.g. resonant cavity LEDs and VCSELs.

Coordinator

THE UNIVERSITY OF SHEFFIELD
Address
Hounsfield Road
S3 7RH Sheffield
United Kingdom

Participants (7)

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS)
France
Address
Rue Bernard Gregory, Sophia Antipolis
06560 Valbonne
ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE
Switzerland
Address
Station 3
1015 Lausanne
SHARP LABORATORIES OF EUROPE LTD
United Kingdom
Address
Edmund Halley Road Oxford Science Park
Oxford
THE UNIVERSITY OF SOUTHAMPTON
United Kingdom
Address
Highfield
SO17 1BJ Southampton
UNIVERSITA DEGLI STUDI DI ROMA "TOR VERGATA"
Italy
Address
Via Del Politecnico 1
00133 Rome
UNIVERSITY OF STRATHCLYDE
United Kingdom
Address
107 Rottenrow
G4 ONG Glasgow
Université Blaise Pascal CLERMONT-FERRAND II
France
Address
24 Avenue Des Landais
63177 Aubière