Light-matter interaction in the context of optical trapping forms the fundamental basis for manipulating objects, enabling a plethora of exciting discoveries in many aspects of science and applications. To date, optical trapping has been explored exclusively on the interactions between electric field component of light and matter. Here we demonstrate the first magnetic optical trap in manipulating nano-objects in space. The potential created purely from magnetic component of light can selectively trap nanoparticles based on the optical magnetic susceptibility. Our work presents a new degree of freedom for studying fundamental light-matter interactions and nano-trapping and manipulation technologies.
We demonstrate subwavelength scale color pixels in a CMOS compatible platform based on anti-Hermitian metasurfaces. In stark contrast to conventional pixels, spectral filtering is achieved through structural color rather than transmissive filters leading to simultaneously high color purity and quantum efficiency. The subwavelength anti-Hermitian metasurface sensor is able to sort three colors over a 100 nm bandwidth in the visible regime, independently of the polarization of normally-incident light. Furthermore, the quantum yield approaches that of commercial silicon photodiodes, with a responsivity exceeding 0.25 A/W for each channel. Our demonstration opens a new door to subwavelength pixelated CMOS sensors and promises future high-performance optoelectronic systems.
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