Journal
ADVANCED OPTICAL MATERIALS
Volume 9, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202100297
Keywords
actively switchable; beam steering; hydrophilic; hydrophobic selective; immersion metasurfaces; liquid wetting
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Funding
- Recruitment Program of Global Experts [501100010871]
- Start-up program of Wuhan University [501100007046]
- Wuhan Science and Technology Bureau [2020010601012196]
- Start-up program of Hangzhou Dianzi University [KYS385618067]
- National Key Scientific Instrument and Equipment Development Project of China [51927802]
- Zhejiang Provincial Key Research and Development Program [2019C01121]
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A new liquid-immersive mechanism with metasurfaces for active beam-steering has been proposed and experimentally realized, enabling switchable beam-steering with a large reflection angle in the broadband visible regime. This innovative approach provides a straightforward tuning strategy for structural patterning and large-area implementation, promising potential applications in tunable display, directional emission, sensing technologies, etc.
Liquid immersion on metasurface was earlier demonstrated to realize spectral control. However, it remains a great challenge to achieve tunable phase modulation and versatile beam-steering performance, which are critical for practical optoelectronic devices. Here, a new liquid-immersive mechanism with metasurfaces for active beam-steering is proposed and experimentally realized. Based on the dielectric-on-metal nanostructure with selective hydrophilic/hydrophobic properties, the switchable beam-steering is initiated and successfully presented in the broadband visible regime with a large reflection angle of approximate to +/- 30 degrees. Specifically, the beam diffraction direction is tuned between two opposite-directional channels by water immersion or drying in a repeatable and controllable manner. The proposed straightforward tuning strategy enjoys great convenience in structural patterning and large-area implementation, instead of requiring any complicated contact patterning or external modulation. This study provides an alternative optical platform for switchable beam-steering functionality, which is promising for potential applications in tunable display, directional emission, sensing technologies, etc.
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