Nonlinear And Quantum Light Sources Enabled By Dielectric Metasurfaces

2022-10-07 Prof. Dragomir Neshev, Director, ARC Centre of Excellence for Transformative Meta

ABSTRACT :

Nonlinear optical phenomena are central to a myriad of applications in light sources and microscopy. Nonlinear optical effects, such as harmonic generation, frequency mixing and spontaneous parametric down conversion (SPDC) are fundamentally enhanced in materials with a high refractive index, as well as by the presence of resonant photonic environment. These conditions are automatically fulfilled in resonant dielectric metasurfaces, which has triggered large interest in nonlinearity enhancement at the nanoscale. Despite their small volume, the dielectric metasurfaces can enhance the nonlinear frequency conversion to a level similar to millimetre-scale nonlinear crystals. Importantly, the nanostructuring enables properties not possible in bulk crystals, including engineering of the directionality of emission and polarisation of the emitted light. In this talk, I will review the recent advances in the field of nonlinear metasurfaces for enhancement of nonlinear frequency conv ersion and shaping of the directionality of emission. In particular, I will focus on the control of forward to backward second harmonic emission in single-crystal transition-metal-dichalcogenide metasurfaces. I will further present possible applications of nonlinear metasurfaces for nonlinear upconversion imaging and generation of non-classical photon states with engineered momentum entanglement.

Event Name

Seminars

Place

Online

Start Time

09:00

End Time

10:00

External Link

PDF to Talk