TY - GEN
T1 - Tuneable terahertz frequency-selective absorber based on a graphene/gold bilayer metasurface
AU - Squires, A. D.
AU - Gao, X.
AU - Du, J.
AU - Han, Z.
AU - Seo, D. H.
AU - Cooper, J. S.
AU - Murdock, A. T.
AU - Lam, S. K.H.
AU - Zhang, T.
AU - Van Der Laan, T.
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - In this work, a 0.2 THz electrically tuneable frequency-selective absorber is designed, fabricated, and experimentally tested. The tuneable absorber is achieved through a novel graphene/gold bilayer with a superimposed metamaterial structure. With this approach, a high-quality resonance is provided by the gold, with electrical tuneability from the graphene, in the bilayer. 16 dB of amplitude tuning at the designed 0.2 THz resonance is demonstrated, alongside 95% broadband modulation for only 6V applied bias. Terahertz time domain spectroscopy in reflection geometry is used to experimentally characterize the device, developed through an equivalent circuit model and three-dimensional full wave modelling and simulation in CST Microwave Studio. The design, fabrication and testing method are readily adaptable to other non-tuneable metal metasurfaces to produce a myriad of reconfigurable terahertz devices.
AB - In this work, a 0.2 THz electrically tuneable frequency-selective absorber is designed, fabricated, and experimentally tested. The tuneable absorber is achieved through a novel graphene/gold bilayer with a superimposed metamaterial structure. With this approach, a high-quality resonance is provided by the gold, with electrical tuneability from the graphene, in the bilayer. 16 dB of amplitude tuning at the designed 0.2 THz resonance is demonstrated, alongside 95% broadband modulation for only 6V applied bias. Terahertz time domain spectroscopy in reflection geometry is used to experimentally characterize the device, developed through an equivalent circuit model and three-dimensional full wave modelling and simulation in CST Microwave Studio. The design, fabrication and testing method are readily adaptable to other non-tuneable metal metasurfaces to produce a myriad of reconfigurable terahertz devices.
UR - http://www.scopus.com/inward/record.url?scp=85177678563&partnerID=8YFLogxK
U2 - 10.1109/IRMMW-THz57677.2023.10299309
DO - 10.1109/IRMMW-THz57677.2023.10299309
M3 - Conference contribution
AN - SCOPUS:85177678563
T3 - International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
BT - IRMMW-THz 2023 - 48th Conference on Infrared, Millimeter, and Terahertz Waves
PB - IEEE Computer Society
T2 - 48th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2023
Y2 - 17 September 2023 through 22 September 2023
ER -