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9 September 2019 Dynamic all-dielectric metasurfaces (Conference Presentation)
Willie J. Padilla, Kebin Fan
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Proceedings Volume 11081, Active Photonic Platforms XI; 1108118 (2019) https://doi.org/10.1117/12.2530306
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
Abstract
All-dielectric metasurfaces are a versatile platform to investigate a host of exotic electromagnetic responses. Effects including high absorption, bound-states-in-the-continuum (BIC), and Huygens’ surfaces have been shown. However, conventional dielectric metasurfaces achieve their properties through geometry alone, and are consequently static. The usefulness for realistic applications is thus inherently limited. In order to overcome the limitations of static all-dielectric metasurfaces, we utilize optical photodoping to attain precise and ultrafast control. We demonstrate the optical control of Huygens’ metasurface (HMS) absorbers, and a dynamic BIC at terahertz frequencies. The BIC realizes a high-quality factor resonance Q ~ 8700 which may be modified by over 2 orders of magnitude by photodoping with bandgap light. The HMS absorber achieves an intensity transmission modulation depth of 99.93% and an associated phase change of greater than π/2 rad. Coupled mode theory and S-parameter simulations are used to elucidate the mechanism underlying the dynamics of the metasurfaces. Similar to metal-based metamaterials, both systems may be scaled in size to operate in nearly any band of the electromagnetic spectrum. The dynamic photonic systems studied here show wide tunability and versatility which are not limited to the spectral range demonstrated, offering a new path for reconfigurable metasurface applications. Our demonstration of dynamic control can be leveraged for applications requiring ultrafast response, or spatial filtering, leading to more compact, efficient, and versatile photonic components.
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Willie J. Padilla and Kebin Fan "Dynamic all-dielectric metasurfaces (Conference Presentation)", Proc. SPIE 11081, Active Photonic Platforms XI, 1108118 (9 September 2019); https://doi.org/10.1117/12.2530306
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KEYWORDS
Electromagnetism
Ultrafast phenomena
Absorption
Control systems
Dielectrics
Metamaterials
Modulation
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