Bulletin of the American Physical Society
2023 Annual Meeting of the APS Mid-Atlantic Section
Friday–Sunday, November 3–5, 2023; University of Delaware, Newark, Delaware
Session C04: Applied Physics
9:00 AM–10:36 AM,
Saturday, November 4, 2023
University of Delaware
Room: Gore 102
Chair: Ali Kefayati, State Univ of NY - Buffalo
Abstract: C04.00003 : Adaptive THz metamaterials activated by phase-transition materials driven MEMS*
9:48 AM–10:00 AM
Presenter:
Zhixiang Huang
(University of Delaware)
Authors:
Zhixiang Huang
(University of Delaware)
Weipeng Wu
(University of Delaware)
Zizwe A Chase
(University of Illinois at Chicago)
Eric Herrmann
(University of Delaware)
Ke Ma
(University of Delaware)
Thomas A Searles
(University of Illinois at Chicago)
Benjamin Jungfleisch
(University of Delaware)
Xi Wang
(University of Delaware)
The metamaterials take advantage of VO2's ability to expand or shrink significantly during its phase transition. By pairing it with other thin film materials, we created multi-layered cantilever unit cells with customizable and controllable bends based on VO2's phase change. Furthermore, this volumetric change is a completely reversible process.
In our design, we showcase spiral cantilevers with spiral shapes that react strongly with the incoming THz waves. Once fabricated, these spirals can move in the vertical direction under control while the anchoring area remains in a fixed position. All components together form adaptable materials that provide switchable chirality and dynamic tunability. When the structures interact with incident THz beams, they perform strong and dynamic polarization modulation with large azimuth rotation angle change and ellipticity angle change.
The operation of these metamaterials mandates a modest thermal modulation of approximately 30 °C adjacent to ambient conditions, via strategies like global or Joule-induced heating. In essence, the THz metamaterials, harmonized with the VO2-driven MEMS mechanisms, offer an approach for modulating THz waves with high modulation depth. With their versatile design, dynamic tunability, facile operational mechanisms, and enduring robustness, these metamaterials are suited for THz applications such as radar, communications, and imaging systems.
*This research was supported by NSF through the University of Delaware Materials Research Science and Engineering Center, DMR-2011824
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