EPSRC CDT in Metamaterials: Terahertz detectors using novel metamaterials approaches

The studentship is part of the EPSRC Centre of Doctoral Training in Metamaterials (XM2). Its 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.

By structuring chalcogenide semiconductor materials in appropriate ways, such as via the formation of superlattice-like arrangements, it has proved possible to generate a host of exciting and unusual properties in one and same material structure. Such properties include (i) ultra-low power (non-melting) phase-change switching, (ii) electric-field induced magneto-resistance (iii) electric field induced band gap control (similar in some respects to that found in graphene) – see e.g. [1-3]. Many of these properties have important potential applications, such as in THz detection, in reconfigurable integrated photonics, in photonic and electronic memories and processors, in optoelectronics sensors and detectors. However, the optical (and electro-optic and magneto-optic) properties of these chalcogenide topological insulators have barely been explored, neither has the idea of combining these materials with metasurfaces in order to fully exploit their remarkable properties. In this project we will investigate both the fundamental properties and application potential of this important new class of (meta)materials. We will combine atomistic simulation as well as fundamental materials characterisation to understand their unusual electronic and optical properties, and apply these properties to the design and development of phase-change meta devices with reduced operating power, faster speeds, prolonged lifetime and increased endurance (switching cyclability). The project and student will benefit from interactions with existing CDT cohorts, via ongoing projects in the development of chalcogenide materials and phase-change metadevices.

[1] Hase M et al., Nature Comms 6, 8357 (2015)

[2] Sa B et al., Phys Rev Lett 109, 096802 (2012)

[3] Bang D et al., Sci Rep 4, 5727 (2014)