This is a unique and exciting opportunity to develop graphene-based terahertz (THz) quantum cascade laser (QCL). This research will form part of a wider research programme within the existing group led by Dr S Chakraborty and it is expected that the PhD student will work in partnership with other researchers, in Manchester and collaborating University(ies).
Graphene-based surface plasmon-polaritons (SPPs) at THz frequencies are attracting significant interest, due to graphene’s intrinsic properties of tunable conductivity, THz resonant frequencies, and convenient exploitation in photonic integrated circuit (PIC) platforms. Incorporating feedback with SPP amplifiers results in ‘spasers’ (i.e. SPP lasers): the resonating plasmonic layer combining with an electrically-pumped gain medium to form a two-level emitter. Analogous to laser coherent stimulated emission, a spaser generates coherent SPP stimulated emission with intense, nanoscale-localized EM fields. Attempts to realize spasers have faced multiple challenges: absorption losses in metal being particularly high at THz optical frequencies, and the difficulty of exciting a nanostructured local field via a resonant external EM field – it being tough to selectively excite just the required single or few mode(s). This proposal aims at changing that.
Here, we will explore and combine a number of different areas of cutting-edge research and provide a transformative technology to produce a fully integrated tunable graphene laser- and opto-plasmonic-based THz information-processing platform. This will lead to significant new understanding of the properties of the various materials and integration techniques involved.
Anticipated start date for project: July or September 2022
Suitable candidates will have, or be expected to attain, at least a 2:1 degree (upper second or equivalent) in electrical/electronic engineering, or physics, or similar scientific discipline.
Equality, diversity and inclusion is fundamental to the success of The University of Manchester, and is at the heart of all of our activities. We know that diversity strengthens our research community, leading to enhanced research creativity, productivity and quality, and societal and economic impact. We actively encourage applicants from diverse career paths and backgrounds and from all sections of the community, regardless of age, disability, ethnicity, gender, gender expression, sexual orientation and transgender status.
We also support applications from those returning from a career break or other roles. We consider offering flexible study arrangements (including part-time: 50%, 60% or 80%, depending on the project/funder).
All appointments are made on merit.
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