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

ABSTRACT 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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Available from: Hatice Altug, Aug 22, 2015
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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.
    Journal of optics 12/2014; 16(12). DOI:10.1088/2040-8978/16/12/125013 · 2.01 Impact Factor
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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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    ABSTRACT: We show that second harmonic generation can be enhanced by Fano resonant coupling of asymmetric plasmonic metal nanostructures. We develop a theoretical model examining the effects of electromagnetic interaction between two metal nanostructures on the second harmonic generation. We compare the second harmonic generation efficiency of a single plasmonic metal nanostructure with that of two coupled ones. We show that second harmonic generation from a single metal nanostructure can be enhanced about 30 times by attaching a second metal nanostructure with a 10 times higher quality factor than that of the first one. The origin of this enhancement is Fano resonant coupling of the two metal nanostructures. We support our findings on Fano enhancement of second harmonic generation by an experimental study of a coupled plasmonic system composed of a silver nanoparticle and a silver nanowire on glass surface in which the ratio of the quality factors are also estimated to be around 10 times.
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    • "Electromagnetically induced transparency (EIT) is the elimination of absorption over a narrow spectral region in a broad absorption regime [1] [2]. Plasmonic structures are investigated for EIT-like applications since they have wide operational bandwidth and are easy to integrate into nm-scale circuits [3] [4] [5] [6]. PIT has been first introduced by Zhang et al. with a π-shaped structure composed of a single metal rod (dipolar antenna) and two parallel metal rods (quadrupolar antenna) perpendicular to the dipolar antenna [3]. "
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    ABSTRACT: We propose a planar metamaterial composed of asymmetrically positioned π-shaped structures that exhibits plasmon induced transparency (PIT). The system enables fine tuning of PIT spectral behavior and near field enhancement control and provides smaller mode volumes.
    CLEO: Plasmonic Oligomers, San Jose, California United States; 05/2012
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