Here, we demonstrate a 2D exciton-polariton system by strongly coupling atomically thin tungsten diselenide (WSe2) monolayer to a silicon nitride (SiN) metasurface. Via energy-momentum spectroscopy of the WSe2-metasurface system, we observed the characteristic anti-crossing of the polariton dispersion both in the reflection and photoluminescence spectrum. A Rabi splitting of 18 meV was observed which matched well with our numerical simulation. Moreover, we showed that the Rabi splitting, the polariton dispersion and the far-field emission pattern could be tailored with subwavelength-scale engineering of the optical meta-atoms.
In recent years, diffractive, discrete scatterer based optics such as metasurfaces have shown considerable promise in the realization of arbitrary optical functions. However, these optical elements are systems large numbers of tunable degrees of freedom that are impractical to tune using forward design methods. In parallel, there has been great progress in using computational inverse design methods to produce high quality nanophotonic elements. We show that this inverse design method is capable of handling the large scale of the three-dimensional electromagnetic scattering problem, and leads to a realistic path towards the computational design and optimization of these discrete scatterer based optics capable of performing arbitrary optical functions in the far field. Then, we present an experimental demonstration of an optical element at 1.55 μm that focuses light into a discrete helical pattern that is designed using an inverse method based on generalized Lorenz-Mie scattering theory. This optical function is realized by specifying a suitable figure of merit that encapsulates the performance of the optical element. The fabrication of these optical elements with such small length scales is done using the Nanoscribe GT two-photon lithography system.
Layered materials have recently emerged as a promising class of optoelectronics material with high quantum efficiency of photo-emission, absorption and nonlinear optical properties. With significant progress in understanding the material science of these atomically thin materials, it is an opportune time to integrate these materials with existing optoelectronic platform to realize the full potential of the 2D materials. Integrating 2D material with nano-resonator could efficiently enhance the light-matter interaction and develop novel optoelectronics devices. Cavity-enhanced 2D material electro-optics modulation, nano-laser, and second order nonlinear devices has been demonstrated. In this paper, we report our recent progress on the cavity-integrated TMDC monolayer platform, including novel cavities for 2D material photonics and cavity nonlinear optics.
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