Nonlinear & microstructured optical materials

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PhD Projects:

Ferroelectric/TMD-monolayer tunable optoelectronics

Supervisor: Sakellaris Mailis
Co-Supervisors: Pier Sazio, Dan Hewak

Technologies that are associated with single photon sources are essential for the development of quantum communications and quantum information processing. To this end there has been extended activity in this research area which is largely relevant to Physics and materials science.

This project is dedicated to the development of such sources based on quantum dots that consists of 2D materials, such as MoS2 and other transition metal dichalchogenides) which are deposited onto the tips of ultra-sharp ferroelectric micro-structures. The main advantages of such an arrangement come from i) the positioning accuracy of the quantum dot and ii) from the functionality of the ferroelectric substrate which can be tuned electrically and/or optically to modulate the emission of light from the quantum dots.

The research program will provide numerous training opportunities to the candidate ranging from cleanroom-based fabrication techniques to high precision spectroscopy and electronic device characterization method

Laser processed Silicon/Ferroelectric photonics

Supervisor: Sakellaris Mailis
Co-Supervisors: Anna Peacock and Harold Chong

This project targets the integration of silicon with optically nonlinear, ferroelectric lithium niobate crystals to produce a photonic platform that will benefit from the properties of its constituent materials.
Silicon, which is synonymous with microelectronics and more recently with integrated photonic circuits, is limited by the lack of electro-optic and second order nonlinear response. Lithium niobate has a well-established pedigree in industrial photonics because of its electro-optic and nonlinear optical functionality throughout the visible and mid infrared spectral region.
This project will produce i) laser processed silicon photonic structures on lithium niobate and ii) laser processed thin film lithium niobate on silicon substrates to demonstrate multifunctionality beyond the limits of individual silicon or lithium niobate materials. The project will have elements of: i) materials growth (deposition of amorphous silicon and other starting materials); ii) device fabrication (photolithographic patterning and laser crystallization) of various integrated photonic components such as couplers, resonators, modulators etc; and iii) optical characterization and device benchmarking.

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