Tailoring terahertz plasmons with silver nanorod arrays

Cao, Wei; Song, Chunyuan; Lanier, Thomas E.; Singh, Ranjan; O’Hara, John F.; Dennis, W. M.; Zhao, Yiping; Zhang, Weili

doi:10.1038/srep01766

Cited by 26 publications

(7 citation statements)

References 42 publications

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“…Such enhancement is directly associated with the plasmonic coupling with induced THz radiation at the junction because the scattering efficiency of AuNR is stronger at parallel polarization conditions. While consistent with previous works on different systems, [34][35][36] this demonstration offers a unique capability to probe single nanoscale objects.…”

supporting

confidence: 87%

Photoconductive response of a single Au nanorod coupled to LaAlO3/SrTiO3 nanowires

Jnawali

Huang

et al. 2015

Applied Physics Letters

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Terahertz (THz) spectroscopy is an important tool that provides resonant access to free carrier motion, molecular rotation, lattice vibrations, excitonic, spin, and other degrees of freedom. Current methods using THz radiation suffer from limits due to diffraction or low-sensitivity, preventing application at the scale of single nanoscale objects. Here, we present coupling between plasmonic degrees of freedom in a single gold nanorod and broadband THz emission generated from a proximal LaAlO3/SrTiO3 nanostructure. A strong enhancement of THz emission is measured for incident radiation that is linearly polarized along the long axis of the nanorod. This demonstration paves the way for the investigation of near-field plasmonic coupling in a variety of molecular-scale systems.

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supporting

confidence: 87%

Photoconductive response of a single Au nanorod coupled to LaAlO3/SrTiO3 nanowires

Jnawali

Huang

et al. 2015

Applied Physics Letters

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“…There are a number of papers in this field tackling the problems of magneto-optics [6][7][8], opto-acoustics [9,10], and plasmonics [11][12][13], often extending the experimental approaches into the nonlinear domain [14] or employing time-resolved techniques [15][16][17][18][19].…”

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confidence: 99%

Femtosecond laser-induced optical anisotropy in a two-dimensional lattice of magnetic dots

et al. 2014

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Using pump-probe optical polarimetry we demonstrate that femtosecond laser excitation of a 2D regular lattice of magnetic nanodots effectively changes the optical anisotropy of the array. Study of the dynamics of the femtosecond laser-induced anisotropy reveals four main mechanisms occurring in the electronic, spin, and lattice subsystems. Below 1 ps, a strong Kerr-like nonlinearity causes linear birefringence, with its axis directed along the electric field of the linearly polarized femtosecond laser pump pulse. In addition, a long-living linear birefringence is also induced due to slowly relaxing excitations. Also below 1 ps, ultrafast laser-induced demagnetization of Co leads to a partial breakdown of the circular birefringence of the magnetic nanodots. On the timescale up to 300 ps, optically triggered acoustic modes of the dots drive oscillations of the linear optical birefringence. During this process, the oscillations damp while transferring their energy into acoustic modes of the substrate. On the nanosecond timescale, the signal is dominated by acoustic oscillations at the surface of the substrate.

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“…Here, the LC of smectic c phase is used because it has a tilt angle and the tilt angle can be adjusted by an external electric field 28 29 . According to the previous reports 30 31 , the tilted array of nanorods is benefit for decreasing the thickness of polarization-dependent terahertz plasmons or other metamaterial devices. Thus, when the gold nanorods are dispersed into the LC of smectic c phase, the nanorods will align with the LC molecule and we can change the orientation of gold nanorods by adjusting the tilt angle of LC by external electric field 32 .…”

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confidence: 95%

Soft and broadband infrared metamaterial absorber based on gold nanorod/liquid crystal hybrid with tunable total absorption

Yin

Zhao

2015

Sci Rep

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We design a soft infrared metamaterial absorber based on gold nanorods dispersed in liquid crystal (LC) placed on a gold film and theoretically investigate its total absorption character. Because the nanorods align with the LC molecule, the gold nanorods/LC hybrid exhibits different permittivity as a function of tilt angle of LC. At a certain tilt angle, the absorber shows an omnidirectional total absorption effect. By changing the tilt angle of LC by an external electric field, the total absorption character can be adjusted. The total absorption character also depends on the concentration, geometric dimension of nanorods, and defect of nanorod arrangement in LC. When the LC contains different size of gold nanorods, a broadband absorption can be easily realized. The characteristics including flexibility, omnidirectional, broadband and tunablility make the infrared metamaterial absorber possess potential use in smart metamaterial devices.

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Tailoring terahertz plasmons with silver nanorod arrays

Cited by 26 publications

References 42 publications

Photoconductive response of a single Au nanorod coupled to LaAlO3/SrTiO3 nanowires

Photoconductive response of a single Au nanorod coupled to LaAlO3/SrTiO3 nanowires

Femtosecond laser-induced optical anisotropy in a two-dimensional lattice of magnetic dots

Soft and broadband infrared metamaterial absorber based on gold nanorod/liquid crystal hybrid with tunable total absorption

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