Ett komponent-fysikaliskt perspektiv på blå mikrokavitets-lasrar och resonanta lysdiodrar i III-nitrid-material

This project takes a new approach for realizing gallium-nitride (GaN) based microcavity light sources emitting in the blue wavelength regime, which could lead to innovative solutions e.g. in laser-based solid-state lighting and biomedicine. In spite of impressive materials-oriented research results in GaN, no blue microcavity light source has yet been demonstrated with acceptable performance: the output power is low, they are very energy-inefficient, and the lifetime is only a few minutes, at most. This is in sharp contrast to cutting-edge microcavity lasers and LEDs emitting at near-infrared wavelengths. Striving for a break-through, this project takes a device-oriented approach, profiting from our leading research on near-infrared sources, while solidly supported by our materials expert collaborators at EPFL in Lausanne. We will consider all critical problems, with main focus on achieving (1) precise spectral tuning of the optical gain, the feedback mirror reflectivity and the cavity resonance (2) efficient current injection and (3) low optical losses. Although the GaN-based materials research has resulted in basic epitaxial structures of high quality, our unique device perspective is crucial; for instance (1) is addressed by novel high-contrast feedback elements with tunable phase response and (2) and (3) by recently developed GaN tunnel junctions and control of the current and optical field distribution by methods inspired by those used in infrared microcavity lase

Start date 01/01/2015
End date The project is closed: 31/12/2018

Page manager Published: Wed 12 Feb 2020.