Analytical description of subwavelength plasmonic MIM resonators and of their combination

Koechlin, Charlie; Bouchon, Patrick; Pardo, Fabrice; Pélouard, Jean-Luc; Haïdar, Riad

doi:10.1364/oe.21.007025

Cited by 63 publications

(53 citation statements)

References 19 publications

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“…This resonance can be explained in terms of standing waves and can be expressed as λ r = 2n eff W + θ, where n eff is the effective refractive index of the MIM mode, θ is the phase term due to reflections from the edges. The resonance wavelength and W show a linear relationship [47]. When the structures are fabricated using electron beam lithography, due to the finite point-spread function width of the electron beam, the corners acquire a finite curvature.…”

Section: Resultsmentioning

confidence: 99%

Rounding corners of nano-square patches for multispectral plasmonic metamaterial absorbers

Ayas¹,

Bakan²,

Dâna³

2015

Opt. Express

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Multispectral metamaterial absorbers based on metal-insulatormetal nano-square patch resonators are studied here. For a geometry consisting of perfectly nano-square patches and vertical sidewalls, double resonances in the visible regime are observed due to simultaneous excitation of electric and magnetic plasmon modes. Although slightly modifying the sizes of the square patches makes the resonance wavelengths simply shift, rounding corners of the square patches results in emergence of a third resonance due to excitation of the circular cavity modes. Sidewall angle of the patches are also observed to affect the absorption spectra significantly. Peak absorption values for the triple resonance structures are strongly affected as the sidewall angle varies from 90 to 50 degrees. Rounded corners and slanted sidewalls are typical imperfections for lithographically fabricated metamaterial structures. The presented results suggest that imperfections caused during fabrication of the top nanostructures must be taken into account when designing metamaterial absorbers. Furthermore, it is shown that these fabrication imperfections can be exploited for improving resonance properties and bandwidths of metamaterials for various potential applications such as solar energy harvesting, thermal emitters, surface enhanced spectroscopies and photodetection.

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Section: Resultsmentioning

confidence: 99%

Rounding corners of nano-square patches for multispectral plasmonic metamaterial absorbers

Ayas¹,

Bakan²,

Dâna³

2015

Opt. Express

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“…This is illustrated here in the case of metal-insulator-metal (MIM) antenna, which are able to funnel and totally absorb the incoming light at their resonance. [14][15][16] In Fig. 4, we show that is it possible to move the focused beam into different points of the grating and to study this effect on the resulting diffracted fields.…”

Section: Moving and Tilting The Focused Beammentioning

confidence: 99%

Simulating the focusing of light onto 1D nanostructures with a B-spline modal method

et al. 2015

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Focusing the light onto nanostructures thanks to spherical lenses is a first step to enhance the field, and is widely used in applications, in particular for enhancing non-linear effects like the second harmonic generation. Nonetheless, the electromagnetic response of such nanostructures, which have subwavelength patterns, to a focused beam can not be described by the simple ray tracing formalism. Here, we present a method to compute the response to a focused beam, based on the B-spline modal method. The simulation of a gaussian focused beam is obtained thanks to a truncated decomposition on plane waves computed on a single period, which limits the computation burden.

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“…Typically, the unit cell of a PMA is composed of a patterned metallic patch and metallic ground separated by a dielectric layer and forms a metal-insulator-metal (MIM) structure [5,6,12,13]. Perfect light absorption happens only at the selected wavelength when a LSPP is excited.…”

Section: Introductionmentioning

confidence: 99%

Ultrabroadband Mid-infrared Light Absorption Based on a Multi-cavity Plasmonic Metamaterial Array

2015

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We present a broadband plasmonic metamaterial absorber in the infrared region based on localized surface plasmon polaritons (LSPPs). The unit cell of the proposed metamaterial absorber consists of a multi-cavity structure, in which absorption resonances can be tuned independently through the modification of the width and shift of metallic walls. In order to avoid the degeneration between two contiguous resonances, which dramatically reduces the bandwidth, we introduce a zigzag design rule to arrange the cavities within a compact unit. Thus, the possible number of resonances is greatly increased, enabling an ultrabroadband absorption. A broadband absorber is demonstrated with only a few-layer structure and it also has an incident-angle-insensitive feature. Our results have potential applications in photovoltaic devices, emitters, sensors, and camouflage systems.

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Analytical description of subwavelength plasmonic MIM resonators and of their combination

Cited by 63 publications

References 19 publications

Rounding corners of nano-square patches for multispectral plasmonic metamaterial absorbers

Rounding corners of nano-square patches for multispectral plasmonic metamaterial absorbers

Simulating the focusing of light onto 1D nanostructures with a B-spline modal method

Ultrabroadband Mid-infrared Light Absorption Based on a Multi-cavity Plasmonic Metamaterial Array

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