Kavli Affiliate: Zhuo Li
| First 5 Authors: Xiu Liu, Zhuo Li, Zexiao Wang, Hyeong Seok Yun, Sheng Shen
| Summary:
Electrothermal metasurfaces have attracted extensive attention due to their
ability to dynamically control thermal infrared radiation. Although previous
studies were mainly focused on the metasurfaces with infinite unit cells, the
finite-size effect can be a critical design factor for developing thermal
metasurfaces with fast response and broad temperature uniformity in practice.
Here, we study the thermal metasurfaces consisting of gold nanorods with a
finite array size, which, with only several periods, can achieve a resonance
close to that of the infinite case. More importantly, such a small footprint
due to the finite array size results in the response time down to a nanosecond
level. Furthermore, the number of the unit cells in the direction perpendicular
to the axis of the nanorods is found to be insensitive to the resonance and
response time, thus providing a tunability in aspect ratio that can boost the
temperature uniformity in the sub-Kelvin level.
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