Properties of Gold Nanoantennas in the Infrared

Neubrech, Frank; Aizpurua, Javier; Karim, Shafqat; Cornelius, Thomas W.; Pucci, Annemarie

doi:10.1142/9789814241120_0012

Cited by 3 publications

(4 citation statements)

References 37 publications

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“…3 is due to the extinction at the fundamental antenna-like resonance of the gold nanowires [21,24,25]. This resonant extinction exceeds simple shadowing by a factor of about 20 (as measured in the far field) and therefore indicates electromagnetic field intensity enhancement at the resonant antenna.…”

Section: Infrared Microspectroscopymentioning

confidence: 89%

“…Therefore, going from spherical particles to prolate spheroids, the main dipolar resonance splits into two branches with one low-energy plasmonic mode for electric field parallel to the long wire axis. Metal nanowires with about 1 mm lengths and 0.1 mm diameter show resonances in the mid IR range [21,[24][25][26][27]. The larger the length ratio of the long axis of the particle to the short one, the lower becomes the frequency of this mode.…”

Section: Infrared Microspectroscopymentioning

confidence: 99%

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Surface enhanced infrared spectroscopy using gold nanoantennas

Pucci

Neubrech

Weber

et al. 2010

Physica Status Solidi (b)

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9 - Conférence paper: 8th International Conference on Optics of Surfaces and Interfaces (OSI-VIII), SEP 07-11 2009, Ischia (ITALY)The sensitivity of infrared (IR) vibration spectroscopy can be enhanced by several orders of magnitude if plasmonic electromagnetic nearfield enhancement is exploited. For maximum enhancement the plasmonic resonance needs to be strong, which cannot be achieved by randomly grown metal island films that on average may show already signal enhancement of the order of 1000. Metal nanowires may give sufficiently strong antenna-like plasmonic resonances in the IR that can be adjusted to the molecular vibration frequencies of interest via the wire length. With individual gold nanowires we obtained vibration-signal enhancement up to 500,000 for molecular monolayers adsorbed on gold nanowires. The already obtained enhancement is not a limit. Since antennae coupled via nanogaps should enable strong electromagnetic nearfield enhancement in these gaps, respective arrays would be ideal for surface enhanced IR spectroscopy. First experiments prove the tendency of increasing vibration-signal enhancement with decreasing gap size. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinhei

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Section: Infrared Microspectroscopymentioning

confidence: 89%

Section: Infrared Microspectroscopymentioning

confidence: 99%

Surface enhanced infrared spectroscopy using gold nanoantennas

Pucci

Neubrech

Weber

et al. 2010

Physica Status Solidi (b)

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“…Au layer is sufficiently thicker than the skin depth in the IR wavelength region. 25 Incident IR rays cannot penetrate the Au film, so that absorption by SiO 2 beneath the Au layer is negligible. 5 The Cr/Au layers are selectively etched using a wet etchant to reveal etching holes covered by the sputtered layers.…”

Section: Designmentioning

confidence: 99%

Polarization-selective uncooled infrared sensor with asymmetric two-dimensional plasmonic absorber

et al. 2014

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A polarization-selective uncooled infrared (IR) sensor was developed based on an asymmetric twodimensional plasmonic absorber (2-D PLA). The 2-D PLA has an Au-based 2-D periodic dimple structure, where photons can be manipulated by spoof surface plasmon polaritons. Asymmetry was introduced into the 2-D PLA to realize a polarization selective function. Numerical investigations demonstrate that a 2-D PLA with ellipsoidal dimples (2-D PLA-E) gives rise to polarization-dependent absorption properties due to the asymmetric dimple shape. A microelectromechanical systems-based uncooled IR sensor was fabricated using a 2-D PLA-E through complementary metal oxide semiconductor (CMOS) and micromachining techniques. The 2-D PLA-E was formed with an Au layer sputtered on a SiO 2 layer with ellipsoidal holes. The dependence of the responsivity on the polarization indicates that the responsivity is selectively enhanced according to the polarization and the asymmetry of the ellipsoids. The results provide direct evidence that a polarization-selective uncooled IR sensor can be realized simply by the introduction of asymmetry to the surface structure of the 2-D PLA, without the need for a polarizer or optical resonant structures. In addition, a pixel array where each pixel has a different detection polarization could be developed for polarimetric imaging using standard CMOS and micromachining techniques.

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“…The thickness t b has no impact on the absorption, as long as it is sufficiently thick to reflect incident IR radiation. Thus, t b is considered to be at least >50 nm in the IR wavelength region for practical applications 29 and was set as a semi-infinite thickness for the simulation. The parameters t m , w p , and h p were fixed at 50, 200, and 150 nm, respectively.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of all-metal-based mushroom plasmonic metamaterial absorbers at infrared wavelengths

2015

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Abstract. High-performance wavelength-selective infrared (IR) sensors require small pixel structures, a lowthermal mass, and operation in the middle-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) regions for multicolor IR imaging. All-metal-based mushroom plasmonic metamaterial absorbers (MPMAs) were investigated theoretically and were designed to enhance the performance of wavelength-selective uncooled IR sensors. All components of the MPMAs are based on thin layers of metals such as Au without oxide insulators for increased absorption. The absorption properties of the MPMAs were investigated by rigorous coupled-wave analysis. Strong wavelength-selective absorption is realized over a wide range of MWIR and LWIR wavelengths by the plasmonic resonance of the micropatch and the narrow-gap resonance, without disturbance from the intrinsic absorption of oxide insulators. The absorption wavelength is defined mainly by the micropatch size and is longer than its period. The metal post width has less impact on the absorption properties and can maintain single-mode operation. Through-holes can be formed on the plate area to reduce the thermal mass. A small pixel size with reduced thermal mass and wideband single-mode operation can be realized using all-metal-based MPMAs.

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Properties of Gold Nanoantennas in the Infrared

Cited by 3 publications

References 37 publications

Surface enhanced infrared spectroscopy using gold nanoantennas

Surface enhanced infrared spectroscopy using gold nanoantennas

Polarization-selective uncooled infrared sensor with asymmetric two-dimensional plasmonic absorber

Theoretical investigation of all-metal-based mushroom plasmonic metamaterial absorbers at infrared wavelengths

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