Probing mid-infrared plasmon resonances in extended radial fractal structures

Wallace, Gregory Q.; McRae, Danielle M.; Lagugné‐Labarthet, François

doi:10.1364/ol.44.003865

Cited by 6 publications

(11 citation statements)

References 26 publications

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“…Hierarchical, self-similar, and fractal metamaterials have geometries based on the self-repeatability of a given feature in a recursive pattern, and are known to give multiband spectral responses. , For fractal metamaterials, the arrangement of a given generation, n , can be deduced from the previous generation, n – 1. Many structures have been investigated and characterized using optical methods, revealing optical modes across the visible to the infrared range. , Nevertheless, these measurements are averaged macroscopic measurements and generally do not provide the spatial resolution to locate the plasmon modes in the vicinity of the nanostructures. The spatial correlation of the localized surface plasmon and the structure are generally revealed using modeling methods such as finite difference time domain (FDTD) or discrete dipole approximation (DDA). , These calculations are of importance to understand the localized nature of the plasmon modes, as well as their distribution over a single nanostructure under different wavelengths or distinct polarizations.…”

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confidence: 99%

“…Many structures have been investigated and characterized using optical methods, revealing optical modes across the visible to the infrared range. 21,22 Nevertheless, these measurements are averaged macroscopic measurements and generally do not provide the spatial resolution to locate the plasmon modes in the vicinity of the nanostructures. The spatial correlation of the localized surface plasmon and the structure are generally revealed using modeling methods such as finite difference time domain (FDTD) or discrete dipole approximation (DDA).…”

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confidence: 99%

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Carving Plasmon Modes in Silver Sierpiński Fractals

et al. 2019

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The surface plasmon resonance (SPR) modes of the first three generations of a Sierpiński fractal triangle are investigated using electron energy loss spectroscopy (EELS) complemented with finite difference time domain simulations. The Sierpiński fractal geometry is created in a subtractive manner, by carving triangular apertures into the triangular prism of the previous fractal generation. The ability of the fractal antenna to efficiently utilize space in coupling to long wavelength excitations is confirmed on the single nanostructure level via redshifting of the primary dipole mode as the fractal generation is increased. Through application of the Babinet principle, it is demonstrated that this spectral shift is caused by coupling of two degenerate orthogonal dipolar modes of a single triangle with two degenerate orthogonal dipole modes of the triangular aperture occupying the center of the first generation fractal. It is also shown that the spectral position and strength of the dipole mode can be tuned by altering the size of the central aperture, and thus the capacitance of the equivalent circuit, and the width of the conductive channels joining different fractal building blocks, thereby altering the circuit inductance. Importantly, placing the aperture on a node of the SPR mode causes a shift in energy of this mode without changing the charge configuration; placing the aperture on an antinode of the SPR mode causes no shift in energy, but changes the field configuration, as revealed through EELS measurements. These fractal-specific properties provide new strategies to design, predict, and effectively exploit highly tunable SPR modes using simple building blocks.

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Carving Plasmon Modes in Silver Sierpiński Fractals

et al. 2019

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“…14a. 121,131 In proof-of-principle SEIRA measurements with 4-NTP functionalized onto the dendritic fractals, the SEIRA enhancement was larger than for 4-NTP functionalized onto flat gold. In summary, combination of multiple plasmonic structures on a substrate may lead to multiple resonances with possible additional plasmonic effects through the interaction of the structure.…”

Section: Advanced Multiresonant Substratesmentioning

confidence: 99%

Towards multi-molecular surface-enhanced infrared absorption using metal plasmonics

2022

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“…A similar but more selective approach is based on a multiresonant system with different antenna orientations, [86] where, depending on the polarization of the incident light, plasmon resonances with different spectral locations are excited. Furthermore, the development of nanostructures with more complex geometries such as dendrites [84,87] or Cayley trees [88] has produced a variety of spectrally distinct plasmon resonances useful for SEIRA experiments. For instance, Wallace et al have demonstrated dendritic resonators featuring different shapes and branch numbers to provide resonances from the near-to the mid-IR (Figure 2I).…”

Section: Advanced Geometries and Functionalitiesmentioning

confidence: 99%

Metasurface‐Enhanced Infrared Spectroscopy: An Abundance of Materials and Functionalities

et al. 2022

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Infrared spectroscopy provides unique information on the composition and dynamics of biochemical systems by resolving the characteristic absorption fingerprints of their constituent molecules. Based on this inherent chemical specificity and the capability for label‐free, noninvasive, and real‐time detection, infrared spectroscopy approaches have unlocked a plethora of breakthrough applications for fields ranging from environmental monitoring and defense to chemical analysis and medical diagnostics. Nanophotonics has played a crucial role for pushing the sensitivity limits of traditional far‐field spectroscopy by using resonant nanostructures to focus the incident light into nanoscale hot‐spots of the electromagnetic field, greatly enhancing light–matter interaction. Metasurfaces composed of regular arrangements of such resonators further increase the design space for tailoring this nanoscale light control both spectrally and spatially, which has established them as an invaluable toolkit for surface‐enhanced spectroscopy. Starting from the fundamental concepts of metasurface‐enhanced infrared spectroscopy, a broad palette of resonator geometries, materials, and arrangements for realizing highly sensitive metadevices is showcased, with a special focus on emerging systems such as phononic and 2D van der Waals materials, and integration with waveguides for lab‐on‐a‐chip devices. Furthermore, advanced sensor functionalities of metasurface‐based infrared spectroscopy, including multiresonance, tunability, dielectrophoresis, live cell sensing, and machine‐learning‐aided analysis are highlighted.

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Probing mid-infrared plasmon resonances in extended radial fractal structures

Cited by 6 publications

References 26 publications

Carving Plasmon Modes in Silver Sierpiński Fractals

Carving Plasmon Modes in Silver Sierpiński Fractals

Towards multi-molecular surface-enhanced infrared absorption using metal plasmonics

Metasurface‐Enhanced Infrared Spectroscopy: An Abundance of Materials and Functionalities

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