Careers / Vacancies / PhDs / Light-matter interactions in 2D materials

Light-matter interactions in 2D materials

  • Location: Teddington
  • Type: PhD
  • Closing Date: Ongoing

Semiconducting two-dimensional (2D) materials such as MoS2 and WSe2 exhibit unusual optical properties that can be exploited for novel optoelectronics ranging from flexible photovoltaic cells to harmonic generation and electro-optical modulation devices. Rapid progress of the field enables ways to implement 2D materials into devices with tailored functionalities. For practical device performance, a key challenge is to maximize light–matter interactions in the material, which is inherently weak due to its atomically thin nature. Light management around the 2D layers with the use of plasmonic nanostructures provides a compelling solution.

Scanning probe microscopy (SPM) is widely recognized as one of the most important techniques for measurements of physical properties with nanoscale accuracy. The perspective expansion of traditional SPM is a combination of Atomic Force Microscope with Infrared spectroscopy and SNOM techniques. The new technologies allow to study light- matter interaction at the nanoscale and in regard to 2D materials

In this project we are looking at:

- obtaining quantitative information about photovoltaic and plasmonic properties as well as light-matter interactions in 2D materials and van der Waals heterostructures;

- development of advanced microscopy techniques and modelling of the experimental results;

- design of sensors for IR and Near IR  range.

The work is an essential part of the NPL and RHUL activity in study of 2D materials, which aims at providing in sensitive IR and  Near IR  detectors and technologies; development, testing and validation of different microscopy techniques; establishing traceability of novel AFM approaches. The work is carried out in collaboration with leading European institutions, fully exploring the relevant fabrication and measurement facilities.

The work for the PhD student on the project involves:

  • SPM studies of 2D materials;
  • Development and implementation of advanced microscopic methods;
  • IR spectroscopy and excitation spectra of 2D materials using s-SNOM technique;
  • Development of the approach for quantitative analysis of scattering SNOM images;
  • Design and fabrication of nanodevices and custom-made probes;
  • Measurement of transport properties of nanodevices;
  • Numerical modelling (MATLAB, COMSOL)

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Please note: In line with current UK immigration guidelines, the National Physical Laboratory is only able to employ individuals who have an existing right to work in the UK.

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