EPSRC CDT in Metamaterials: Single photon frequency conversion with non-linear metamaterials

University of Exeter - Departments of Physics and Astronomy, and Department of Engineering

The studentship is part of the EPSRC Centre of Doctoral Training in Metamaterials (XM2), www.exeter.ac.uk/metamaterials. Our aim is to undertake world-leading research, while training scientists and engineers with the relevant research skills and knowledge, and professional attributes for industry and academia.

Joint supervisors: Dr I. Luxmoore, Prof E. Hendry

Efficient frequency conversion has wide-ranging applications in classical and quantum optical information processing. For example, single photons are vital for the communication of quantum information; however, there is a wavelength mismatch between fiber-optic communication networks operating around 1550nm and solid-state quantum optical sources, memories and qubits operating in the visible to near-infrared. Therefore, efficient non-linear frequency conversion is essential for developing hybrid quantum devices for future secure communication and information processing applications. Metamaterial integration provides a scalable route for the development of frequency-conversion interfaces, with resonant cavities offering high quality-factors and small-mode volumes as a means to overcome the inherently low efficiency of non-linear processes.

In this project, the student will investigate the photonic integration of 2D materials as a platform for efficient non-linear frequency conversion. The initial emphasis will be on graphene but other materials, such as transition metal dichalcogenides will also be investigated. Graphene has been shown to have a strong non-linear interaction with light and large enhancements of these non-linear effects have been predicted in the presence of graphene plasmonic resonances. To further enhance the non-linear effects, graphene plasmonic resonators will be coupled to conventional infrared and THz metamaterials [2]. The integration of metamaterial structures, resonant in the mid-IR to THz, with visible/near-IR nano-photonics will also be investigated. This represents a novel, doubly-resonant frequency-conversion platform, which could be used to replace inefficient mid-IR/THz detectors with high-performance and cost-effective silicon-based devices and could be employed for sensing applications [3].

4-year studentship: for UK/EU students, the studentship includes tuition fees and an annual stipend equivalent to current Research Council rates; for international students (non-EU) a very small number of fees only studentships may be available

[1] T. J. Constant et al., Nat. Physics 12, 124 (2016); M. Gullans et al., Phys. Rev. Lett. 111, 247401 (2013).
[2] P. Q. Liu et al., Nat. Commun. 6, 8969 (2015).
[3] I. J. Luxmoore et al., ACS Photonics 3, 936 (2016).

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