Objective
There is an urgent requirement to provide low cost and sensitive systems for pollution sensing and other environmental monitoring applications where trace gases are detected by their fundamental vibrational-rotational absorption bands. This has resulted in a major area of development concerning infrared LEDs and lasers. There has been great progress recently in the development of III-V antimonide-based lasers operating between 2 and 4 micron wavelength and room temperature operation of lasers has been achieved at wavelengths as long as 2.8 micron and to 4.5 micron when cooled to liquid nitrogen temperatures.
The goal of this part of the project is to create and investigate semiconductor sources emitting in the 2-10 micron region for pollution monitoring applications and eventually to achieve laser action at wavelengths longer than 4 microns.
The InAs/In(As,Sb) superlattices appear to be the most promising materials system for long wavelength laser operation as there is a real prospect that the 'type II' band alignments which are thought to occur can suppress the damaging Auger recombination process which provides a radiationless path for recombination and is normally very strong in narrow-gap semiconductors. This is the most important single factor which has prevented laser operation at longer wavelength to date.
The second goal of the project is to study the optical and electrical properties of the quasi-two-dimensional electron-hole plasma. GaSb-InAs heterojunctions or superlattices in which InAs forms quantum wells and the GaSb barriers will be used for these investigations. This system has a semimetallic band alignment so that intrinsically there are equal numbers of electrons and holes. There has been considerable speculation for some time that a narrow- or zero-gap semiconductor system could lead to the formation of stable excitonic states at low temperatures. Experimental evidence for such states has been lacking until very recently when a US group reported far-infrared magneto-optical experiments which showed the presence of an additional line approximately 3 meV above the cyclotron resonance line in a number of InAs/(Ga,Al)Sb quantum wells. This new line disappeared with increasing temperature as would be expected for an excitonic phase.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
This project has not yet been classified with EuroSciVoc.
Be the first one to suggest relevant scientific fields and help us improve our classification service
You need to log in or register to use this function
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Data not available
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Data not available
Coordinator
SW7 2BZ London
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.