The recent advent of van der Waals (vdW) crystals are considered as a new class of material for optoelectronics or photonics applications, as they have a wide range of optical band gap energies and electrical transport properties. Furthermore, due to the nature of vdW interactions, these vdW materials can be transferred onto different substrates, making them a promising candidate for integrated photonics applications. Here, we will exploit these unique properties and describe how to realize ultrathin and integrable light sources, based on photonic crystal cavities integrated van der Waals light emitters. Our demonstrated device can be operated at room temperature with fast modulation speed and enhanced emission intensity. Additionally, we will show ultrathin (~0.14 λ) van der Waals metalenses, which not only can exhibit near diffraction-limited focusing and imaging, but also can be transferred onto flexible substrates to show strain- induced tunable focusing.
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.
2D semiconductors have recently emerged as promising optoelectronic materials, with high quantum efficiency of photoemission, absorption and nonlinear optical properties. With significant progress in understanding the material science of these atomically thin materials, and building devices with stand-alone monolayer materials, it is an opportune time to integrate these materials with existing optoelectronic platform to realize the full potential of the 2D materials. Here, we highlight our recent progress in 2D semiconductor integrated with nanophotonic resonators. Specifically, we report the operation of an optically pumped laser, cavity enhanced electroluminescence and cavity enhanced second harmonic generation.
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