The functionality of optical components can be enhanced by using building blocks smaller than the wavelength of light. Carefully designed sub-wavelength elements can host high concentrations of electromagnetic fields inside them thus enhancing light-matter interactions. Recent developments of high-index dielectric nanoparticles provide a powerful mechanism of light localisation in which multipole resonances generate magnetic responses via displacement current contributions.

In this final PhD seminar, I will present my experimental and theoretical results on quantum and nonlinear classical light sources miniaturised to the nanoscale. These results include the design, nanofabrication and optical characterisation of functional optical components consisting of 2D arrays of subwavelength resonators, known as metasurfaces. These metasurfaces provide phase and polarisation control of laser sources, and control over the emission properties of rare-earth doped nanocrystals. I will also describe a more fundamental application of these metasurfaces: the generation of higher harmonics. This talk will also cover results involving individual subwavelength particles including our most recent demonstrations of five-photon photoluminescence as well as the generation of optical harmonics up to 7th order from single nanoparticles. Finally I will present theoretical and experimental results on quantum light sources based on NV centres in diamonds, where the emission of single photons is controlled by high-index dielectric nanoantennas. Strongly-enhanced emission and efficient optical frequency conversion of both dielectric quantum and classical light sources offer unique potential for nanoscale photonic and electro-optical devices.

Zoom details:  
https://anu.zoom.us/j/84587262457?pwd=ZjlTQ09POGZkTTl3OU54a1l0KzhqUT09
Meeting ID: 845 8726 2457
Password: 753739