We present electrically-driven generation and dynamics of the real-space optical vortices based on the high-dimensional gradient-thickness optical cavity. The structure consists of a metal-dielectric multi-layer that supports non-trivial topological phases, generating optical vortex lines and rings in three-dimensional generalized parameter space. We experimentally demonstrated the high-dimensional gradient-thickness optical cavity by liquid crystal-based multi-layer structure, which bijectively projects a surface slice of generalized parameter space into the real space. By electric control of the alignment of liquid crystal molecules, we successfully spanned the architecture of the high-dimensional optical singularity in real space, which actively generates and manipulates the optical vortex-antivortex pair.
Owing to the Purcell effect, optical micro-structures can control the radiative decay of the quantum emitters in transition metal dichalcogenide (TMDC) media. However, conventional optical microstructures change the local density of optical states (LDOS) not only at the photoluminescence (PL) wavelength of the TMDC quantum emitters and but also at the pump wavelength simultaneously and thus cause an inevitable influence on the excitation conditions. We propose and experimentally demonstrate a reflective metallic metasurface for independently engineering the excitation and radiation of quantum emitters in the TMDC monolayer
The interlayer exciton of van der Waals heterostructure has become a promising platform for realizing Bose-Einstein condensation and demonstrating novel excitonic devices. For increasing the critical temperature of bosonic condensation or long-range transport, the short lifetime of the interlayer excitons has to be improved by suppressing both the radiative and non-radiative recombination processes[1,2]. However, due to its out-of-plane electric dipole nature, the radiative recombination of the interlayer exciton has not yet been able to be suppressed with conventional optical approaches[3,4]. Here, we present a theoretical study on the reflective metasurface that can suppress the density of optical states for the out-of-plane dipole moment. The metasurface consists of Au nanodisks arranged in a square lattice on the Au substrate. We examined the out-of-plane dipole emitter inside the 20-nm-thick hexagonal-BN layer, which is placed on the flat surface of the 140-nm-thick SiO2 layer covering the Au disk array. We targeted the WSe2/MoSe2 interlayer exciton of which the radiation wavelength is 900 nm. Blocking the radiative decay channels of the dipole emitter to the horizontal directions as well as the vertical directions, the proposed metasurface strongly suppresses the Purcell factor down to ~0.011 at maximum (~0.018 on average), which corresponds to the enhancement of the radiative decay time as amount as ~91 times (~56 times).
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