Sub picosecond steering of ultrafast incoherent emission from semiconductor metasurfaces

超短脉冲 光学 光电子学 光发射 皮秒 物理 激光器 波前 全息术 发光二极管 相干控制 纳米光子学
作者
Prasad P. Iyer,Nicholas Karl,Sadhvikas Addamane,Sylvain D. Gennaro,Michael B. Sinclair,Igal Brener
出处
期刊:Cornell University - arXiv
标识
DOI:10.48550/arxiv.2206.04645
摘要

The ability to dynamically steer fs pulses from a monolithically integrated source is a critical milestone for the fields of nanophotonics and ultrafast optics. The nascent field of reconfigurable metasurfaces -- made of optically resonant meta-atoms -- has shown great promise in manipulating light-matter interactions through subwavelength control of the phase, amplitude, and polarization of light. These active metasurfaces arbitrarily transform an incident wavefront using a reconfigurable spatial phase profile and thus have been limited to manipulating coherent external sources. Light emitting metasurfaces obtained through integration of incoherent emitters with meta-atoms, have been used to statically increase the quantum efficiency of the emission through Purcell factor enhancement and control the far-field emission properties of the light to collimate and focus spontaneous emission. Active manipulation of such incoherent light sources, however, remains a challenge as current phase-sensitive approaches used for coherent sources cannot be directly applied. Spatiotemporal control at ultrafast timescales of incoherent light emission could lead to a transformative technological leap allowing low-power light emitting diodes (LEDs) to replace high-power coherent laser sources, enabling holographic LED displays and other key optical transceiver applications including remote-sensing, perception, and high-speed optical communication systems. In this work, we theoretically predict and experimentally demonstrate for the first time, sub-picosecond steering over a 70{\deg} range of ultrafast incoherent emission from a light emitting metasurface.
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