TY - JOUR
T1 - Displacement Current Mediated Resonances in Terahertz Metamaterials
AU - Liu, Chao
AU - Agarwal, Kriti
AU - Zhang, Yuping
AU - Chowdhury, Dibakar Roy
AU - Azad, Abul K.
AU - Cho, Jeong Hyun
N1 - Publisher Copyright:
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2016/8/1
Y1 - 2016/8/1
N2 - Terahertz metamaterials (THz MMs) have been proven to be good candidates for chemical, biological, temperature, strain, and position sensing. However, currently developed thin-metal-film-based split ring resonator (SRR) MMs have relatively low quality factor (Q-factors), leading to a poor sensitivity, which is one of the obstacles for development of sensors. In order to enhance the Q-factor, novel THz MMs, nanopillar-based MMs, are designed, fabricated, and characterized. The nanopillar-based MMs excite the inductive-capacitive resonance via desplacement currents, showing a significantly enhanced Q-factor around 450, which is about 30 times higher than typical thin-metal-film-based MMs. Nanopillar-based MMs also show 17 times larger frequency shift compared to the metal-film-based MMs when the permittivity of the ambient dielectric properties of the MMs changes. Due to high Q-factor and large frequency shift, the nanopillar-based THz MMs utilizing displacement current have great potential for highly sensitive chemical and biomaterial detection as well as frequency-agile THz devices.
AB - Terahertz metamaterials (THz MMs) have been proven to be good candidates for chemical, biological, temperature, strain, and position sensing. However, currently developed thin-metal-film-based split ring resonator (SRR) MMs have relatively low quality factor (Q-factors), leading to a poor sensitivity, which is one of the obstacles for development of sensors. In order to enhance the Q-factor, novel THz MMs, nanopillar-based MMs, are designed, fabricated, and characterized. The nanopillar-based MMs excite the inductive-capacitive resonance via desplacement currents, showing a significantly enhanced Q-factor around 450, which is about 30 times higher than typical thin-metal-film-based MMs. Nanopillar-based MMs also show 17 times larger frequency shift compared to the metal-film-based MMs when the permittivity of the ambient dielectric properties of the MMs changes. Due to high Q-factor and large frequency shift, the nanopillar-based THz MMs utilizing displacement current have great potential for highly sensitive chemical and biomaterial detection as well as frequency-agile THz devices.
KW - displacement current
KW - metamaterials
KW - nanopillars
KW - quality factor
KW - split ring resonators
UR - http://www.scopus.com/inward/record.url?scp=84971238847&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84971238847&partnerID=8YFLogxK
U2 - 10.1002/adom.201600196
DO - 10.1002/adom.201600196
M3 - Article
AN - SCOPUS:84971238847
SN - 2195-1071
VL - 4
SP - 1302
EP - 1309
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 8
ER -