Programmable plasmonic phase modulation of free-space wavefronts at gigahertz rates
| Autor: | Felipe Vallini, Alexei Smolyaninov, Steve Pappert, Yeshaiahu Fainman, Abdelkrim El Amili |
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| Rok vydání: | 2019 |
| Předmět: |
Wavefront
Materials science business.industry Surface plasmon 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials 010309 optics Wavelength Modulation 0103 physical sciences Optoelectronics Photonics 0210 nano-technology business Phase modulation Plasmon Structured light |
| Zdroj: | Nature Photonics. 13:431-435 |
| ISSN: | 1749-4893 1749-4885 |
| DOI: | 10.1038/s41566-019-0360-3 |
| Popis: | Space-variant control of optical wavefronts is important for many applications in photonics, such as the generation of structured light beams, and is achieved with spatial light modulators. Commercial devices, at present, are based on liquid-crystal and digital micromirror technologies and are typically limited to kilohertz switching speeds. To realize significantly higher operating speeds, new technologies and approaches are necessary. Here we demonstrate two-dimensional control of free-space optical fields at a wavelength of 1,550 nm at a 1 GHz modulation speed using a programmable plasmonic phase modulator based on near-field interactions between surface plasmons and materials with an electrooptic response. High χ(2) and χ(3) dielectric thin films of either aluminium nitride or silicon-rich silicon nitride are used as an active modulation layer in a surface plasmon resonance configuration to realize programmable space-variant control of optical wavefronts in a 4 × 4 pixel array at high speed. A 4 × 4 pixel spatial light modulation scheme based on plasmonics offers high-speed spatial light modulation at the telecommunications wavelength of 1,550 nm. |
| Databáze: | OpenAIRE |
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