期刊
SMALL
卷 15, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201805142
关键词
dielectric metasurface; fano resonance; imaging; thermal tuning; tunable metasurface
类别
资金
- Australian Research Council (ARC)
- ARC Discover Early Career Research Fellowship [DE170100250]
- Australian Nanotechnology Network
- Australia-Germany Joint Research Cooperation Scheme
- Guangdong Provincial Innovation and Entrepreneurship Project [2017ZT07C071]
- Australian Research Council [DE170100250] Funding Source: Australian Research Council
Increasing demand for higher resolution of miniaturized displays requires techniques achieving high contrast tunability of the images. Employing metasurfaces for image contrast manipulation is a new and rapidly growing field of research aiming to address this need. Here, a new technique to achieve image tuning in a reversible fashion is demonstrated by dielectric metasurfaces composed of subwavelength resonators. It is demonstrated that by controlling the temperature of a metasurface the encoded transmission pattern can be tuned. To this end, two sets of nanoresonators composed of nonconcentric silicon disks with a hole that exhibit spectrally sharp Fano resonances and forming a Yin-Yang pattern are designed and fabricated. Through exploitation of the thermo-optical properties of silicon, full control of the contrast of the Yin-Yang image is demonstrated by altering the metasurface temperature by Delta T approximate to 100 degrees C. This is the first demonstrated technique to control an image contrast by temperature. Importantly, the turning technique does not require manipulating the external stimulus, such as polarization or angle of the illumination and/or the refractive index of this environment. These results open many opportunities for transparent displays, optical switches, and tunable illumination systems.
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