Multispectral Plasmon Induced Transparency in Coupled Meta-Atoms

Electrical and Computer Engineering Department, Boston University, Boston, Massachusetts 02215, United States.
Nano Letters (Impact Factor: 13.59). 03/2011; 11(4):1685-9. DOI: 10.1021/nl200197j
Source: PubMed


We introduce an approach enabling construction of a scalable metamaterial media supporting multispectral plasmon induced transparency. The composite multilayered media consist of coupled meta-atoms with radiant and subradiant hybridized plasmonic modes interacting through the structural asymmetry. A perturbative model incorporating hybridization and mode coupling is introduced to explain the observed novel spectral features. The proposed scheme is demonstrated experimentally by developing a lift-off-free fabrication scheme that can automatically register multiple metamaterial layers in the transverse plane. This metamaterial which can simultaneously enhance nonlinear processes at multiple frequency domains could open up new possibilities in optical information processing.

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    • "It has been found that PIT possesses many particular applications, such as slow light [14] [15] [16], sensing [17] [18] [19] [20], and optical switching [21]. Many plasmonic nanostructures have been proposed and demonstrated to realize PIT, such as dipole antennas [22] [23], detuned dipoles [24], split ring resonators [25] [26], and metallic nanoparticles [27]. The spectral response for most nanostructures, however, depends strongly on the polarization of the incident wave, which becomes problematic in potential applications. "
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    ABSTRACT: In this article, we demonstrate plasmonic-induced optical transparency (PIT) in a planar metamaterial consisting of a metallic regular triangle (RT) embedded in a ring nanostructure. The interference between the bright dipole mode of the RT and the dark quadrupole mode of the ring leads to the emergence of a transparent window in the visible regime. By combining nanostructures with different degrees of symmetry, the PIT transmission properties of our metamaterial remain stable with respect to the incident polarization, showing polarization-insensitivity to the incident wave. The transmission efficiency of the PIT peak for different polarizations can be maintained at greater than 95.77% with a fluctuation range of 0.01% in our calculation accuracy.
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    • "Fano-like resonances can also take place in two coupled classical oscillators [4] [17], without quantum nature. It is also experimentally demonstrated that coupling with dark modes (which have longer lifetimes) [18] [19] can result in Fano resonances. "
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    • "Inspired by Veselago's theoretical predictions [1] and Pendry's pioneering experimental work [2] [3], research in metamaterials is flourishing in the field of photonics. Metamaterials designed to render desired optical properties are realized by assembling subwavelength unit cells called meta-atoms [4] [5] [6] [7], which are developed in various types such as spiral [8], fishnet [9], labyrinth [10], and electric field coupled [11] resonators, and can lead to various applications such as image compression [12], superlenses [13], cloaking [14], and optical black holes [15]. Among them, terahertz (THz) metamaterial perfect absorbers recently attracted a great amount of attention because of their potential application as sensors and detectors operating at THz frequencies [16]. "
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    ABSTRACT: We present design, fabrication, and characterization of THz stereometamaterial perfect absorber devices. Stereometamaterials consist of a three-dimensional lattice of meta-atoms, which exhibits distinct optical properties depending on the spatial arrangement of the meta-atoms in the unit cell. Integrated into a perfect absorber structure, the absorption and reflection properties of such devices at resonant frequencies reveal unique characteristics that are controlled by the polarization of the incident wave. Because of the break in reflection symmetry, such devices act as polarization-dependent passive switches, with the frequency response of a single band or a dual band absorber. The observed behavior is interpreted in terms of dipole-dipole interaction between the dipoles of the meta-atoms and their mirror images with respect to the metal backplane.
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