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Silicon Heterostructure INtersubband Emitters

Objective

It is the aim of the proposal to investigate and demonstrate an infrared Si/SiGe quantum cascade laser. While the indirect bandgap of silicon prohibits efficient recombination of electrons and holes, inter subb and electroluminescence has been demonstrated by Si/SiGe cascade structures. Theoretical modelling will be used to design parallel and perpendicular injection structures aimed at producing light amplification / gain. Laser cavities and waveguides will also be investigated before being combined with again medium to demonstrate a laser. It is the aim of the proposal to investigate and demonstrate an infrared Si/SiGe quantum cascade laser. While the indirect bandgap of silicon prohibits efficient recombination of electrons and holes, inter subb and electroluminescence has been demonstrated by Si/SiGe cascade structures. Theoretical modelling will be used to design parallel and perpendicular injection structures aimed at producing light amplification / gain. Laser cavities and waveguides will also be investigated before being combined with again medium to demonstrate a laser.

OBJECTIVES
The main objective of the project is to demonstrate an infrared Si/SiGe quantum cascade laser. Epitaxially grown Si/SiGe heterostructures will be fabricated into devices for infrared spectroscopic investigations and to facilitate measurements using the free electron laser. This will allow determination of the energy spacing and subband lifetimes in the quantum wells. Parallel and perpendicular injection mechanisms will be studied with a number of different schemes for light amplification / gain including negative effective mass and LO phonon resonant depopulation. Laser cavities and waveguides will be designed and tested. At all stages theoretical modelling will strongly interact with experimental results to allow efficient design of appropriate devices. Finally an infrared Si/SiGe quantum cascade laser will be designed, grown, fabricated and characterised.

DESCRIPTION OF WORK
WP1 Parallel transport structures using both light hole (LH) to heavy hole (HH) and HH to HH transitions with negative effective mass and resonant LO phonon depopulation: modelling and design; material growth; material characterisation; fabrication of device; determination of best injection mechanism; gain determination through electroluminescence, absorption and intersubband lifetime measurements; modelling validation and calibration;

WP2 Perpendicular injection structures using both light hole (LH) to heavy hole (HH) and HH to HH transitions with negative effective mass and resonant LO phonon depopulation: modelling and design; material growth; material characterisation; fabrication of device; determination of best injection mechanism; gain determination through electroluminescence, absorption and intersubb and lifetime measurements; modelling validation and calibration;

WP3 Laser cavity and waveguide design and fabrication: design using optical and electrical confinement; material growth, processing and fabrication; measurement of gain and losses;

WP4 Demonstration of an infrared Si/SiGe quantum cascade laser: modelling and design; material growth; material characterisation; fabrication; injection mechanism tests;electroluminescence measurements in addition to full device characterisation.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE
Address
The Old Schools, Trinity Lane
CB2 1TN Cambridge
United Kingdom

Participants (8)

HERIOT-WATT UNIVERSITY
United Kingdom
Address
Riccarton
EH14 4AS Edinburgh
LINKOEPINGS UNIVERSITET
Sweden
Address
Campus Valla
581 83 Linkoeping
PAUL SCHERRER INSTITUT (PSI)
Switzerland
Address

5232 Villingen
TERAVIEW LIMITED
United Kingdom
Address
Platinum Building - St John's Innovation Park - Cowley Road
CB4 0WS Cambridge
THALES
France
Address
45 Rue De Villiers
92200 Neuilly Sur Seine
UNIVERSITA DEGLI STUDI DI ROMA "TOR VERGATA"
Italy
Address
Via Orazio Raimondo 18
00173 Roma
UNIVERSITAET LINZ
Austria
Address
Altenbergerstrasse 69
4040 Linz
UNIVERSITE DE NEUCHATEL
Switzerland
Address
Avenue Du Premier Mars 26
2000 Neuchatel