Integrated Metasurfaces on Silicon Photonics for Emission Shaping and Holographic Projection
| Autor: | Ping-Yen Hsieh, Shun-Lin Fang, Yu-Siang Lin, Wen-Hsien Huang, Jia-Min Shieh, Peichen Yu, You-Chia Chang |
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| Rok vydání: | 2022 |
| Předmět: |
Physics::Instrumentation and Detectors
ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Physics::Optics FOS: Physical sciences Physics - Applied Physics Applied Physics (physics.app-ph) Electrical and Electronic Engineering Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Biotechnology Physics - Optics ComputingMethodologies_COMPUTERGRAPHICS Optics (physics.optics) |
| DOI: | 10.48550/arxiv.2205.10537 |
| Popis: | The emerging applications of silicon photonics in free space, such as LiDARs, free-space optical communications, and quantum photonics, urge versatile emission shaping beyond the capabilities of conventional grating couplers. In these applications, silicon photonic chips deliver free-space emission to detect or manipulate external objects. Light needs to emit from a silicon photonic chip to the free space with specific spatial modes, which produce focusing, collimation, orbital angular momentum, or even holographic projection. A platform that offers versatile shaping of free-space emission, while maintaining the CMOS compatibility and monolithic integration of silicon photonics is in pressing need. Here we demonstrate a platform that integrates metasurfaces monolithically on silicon photonic integrated circuits. The metasurfaces consist of amorphous silicon nanopillars evanescently coupled to silicon waveguides. We demonstrate experimentally diffraction-limited beam focusing with a Strehl ratio of 0.82. The focused spot can be switched between two positions by controlling the excitation direction. We also realize a meta-hologram experimentally that projects an image above the silicon photonic chip. This platform can add a highly versatile interface to the existing silicon photonic ecosystems for precise delivery of free-space emission. |
| Databáze: | OpenAIRE |
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