Planar Metamaterial Analogue of Electromagnetically Induced Transparency for Plasmonic Sensing

Abstract

We experimentally demonstrate a planar metamaterial analogue of electromagnetically induced transparency at optical frequencies. The structure consists of an optically bright dipole antenna and an optically dark quadrupole antenna, which are cut-out structures in a thin gold film. A pronounced coupling-induced reflectance peak is observed within a broad resonance spectrum. A metamaterial sensor based on these coupling effects is experimentally demonstrated and yields a sensitivity of 588 nm/RIU and a figure of merit of 3.8.

Metamaterials: a new frontier of science and technology

“…[72][73][74][75][76][77][78][79][80] EIT was first discovered in atomic systems. In a three-level atomic EIT system, 71 the coupling between the excited energy level |2i with a dipole-allowed transition to the ground state |1i and a metastable level |3i by a control beam leads to a destructive interference ( Fig.…”

“…Finally, the sharp spectral resonance can facilitate biochemical detection with high sensitivity. 77 …”

Large‐Area Low‐Cost Plasmonic Nanostructures in the NIR for Fano Resonant Sensing

“…[ 4 ] When designed with the appropriate geometry and symmetry, metallic nanostructures have the potential to exhibit narrow Fano resonances due to destructive interference of the different modes. [5][6][7][8] These Fano resonances can provide enhanced sensitivity and fi gure of merit of localized plasmon sensors, [9][10][11][12] which easily reach or even exceed the best known LSPR sensors in single plasmonic particles. [13][14][15] This is due to the fact that the complex geometry and the many degrees of design freedom allow for tailoring the resonant near-fi elds in a very small volume.…”

Harvesting the loss: surface plasmon-based hot electron photodetection

“…Research on plasmonics has become a flourishing field with numerous applications [11,12], including metamaterials and metasurfaces [13,14], sub-diffraction-limited imaging [15], lasers [16], and cloaking [17]. Plasmonics could also be used to enhance the performance of photovoltaic devices [18,19], photodetectors and modulators [2,20], and environmental sensors [21,22].…”