Lasing Polarization Control and Imaging with Reflective Metasurfaces

In this presentation, I will discuss two specific applications that utilize nanophotonic metasurfaces in reflection. Firstly, we propose the active modulation of the polarization state of a lasing emission at the source using a metasurface-engaged microcavity. This approach allows for generating highly circularly polarized, linearly polarized, or elliptically polarized lasing emissions. By leveraging the strong optical feedback produced by the Fabry-Perot optofluidic microcavity, we can enhance the interactions between light and metasurface atoms, resulting in polarized lasing emissions with high purity and controllability.<br/>Secondly, we introduce and demonstrate a compact snapshot hyperspectral imaging system that incorporates the concept of meta-optics with small-data deep learning theory. Our snapshot hyperspectral imager utilizes a single multi-wavelength metasurface chip operating in the visible window of 500 to 650 nm, significantly reducing the device footprint. To showcase the high performance of our imaging system, we employ a multispectral imaging dataset as the input and through the deep learning-driven imaging system. We generate a hyperspectral data cube with exceptional fidelity through such an approach.<br/>By elegantly integrating multi-resonant metasurfaces with other techniques, such as microcavities and computational imaging, we anticipate the development of low-profile advanced instruments for fundamental science studies and laser physics. This integration will bridge the gap between metasurfaces and microlasers, opening up new possibilities for practical applications.