Chemical Identification of Individual Fine Dust Particles with Resonant Plasmonic Enhancement of Nanoslits in the Infrared

Vogt, Jochen; Zimmermann, Sören; Huck, Christian; Tzschoppe, Michael; Neubrech, Frank; Fatikow, Sergej; Pucci, Annemarie

doi:10.1021/acsphotonics.6b00812

Cited by 21 publications

(27 citation statements)

References 31 publications

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“…This excitation corresponds to an enhanced localized surface phonon-polariton (for details, see Ref. [32,47]). In the Supplemental Material [41], we show that the optical properties of an ultrafine particle are determined by the dielectric function ε(ω) of the material, meaning that the spheres show the excitations that are characteristic for the material itself and therefore give the chemical information that IR spectroscopy can provide.…”

Section: Resultsmentioning

confidence: 99%

“…In the next step, the silica spheres have to be positioned in the hot spot of the bowties. Typically, nanoobjects can be positioned using a nanomanipulator with a very high accuracy of better than 50 nm, as applied by Vogt et al [32]. However, if the particle dimensions fall below 100 nm, this approach reaches its limits and becomes timeconsuming.…”

Section: Resultsmentioning

confidence: 99%

“…The dielectric function of the silica spheres is taken from Ref. [32]. As the dielectric function depends on the manufacturing method of the silica spheres, minor differences are likely and are one reason for slight deviations between experiment and simulation.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…However, the detection and characterization of solid nanoparticles, such as fine dust particles, is also an important but not-recognized field of application. A few years ago, single airborne dust particles with a size in the micrometer range [30,31] were investigated by IR spectroscopy and, recently, Vogt et al have successfully demonstrated the chemical identification of individual silica particles with a diameter of approximately 240 nm in resonantly excited nanoslits by their enhanced-particle phonon-polariton signals [32,33]. However, the experimental step toward the detection of ultrafine dust particles with a diameter below 100 nm has still not been done, although this step might open up new areas of application in, for example, the fields of astronomy, environmental physics, and also medicine, where ultrafine dust plays an important role due to the large impact of the smallest dust particles on environmental safety and respiratory diseases as well as cardiovascular health [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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Chemical Identification of Single Ultrafine Particles Using Surface-Enhanced Infrared Absorption

et al. 2019

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In the past decade, it has been demonstrated that surface-enhanced infrared absorption (SEIRA) is a powerful method to enhance vibrational signals of thin molecular layers. Much less attention has so far been given to the possibility of using SEIRA for the detection and characterization of nanometer-sized particles, such as ultrafine dust particles. Here, we report on SEIRA measurements demonstrating that even one single particle with a deeply subwavelength dimension of less than 100 nm can be detected and chemically characterized with standard infrared microspectroscopy. Our approach is based on plasmonic resonances of bowtie-shaped Au apertures that are designed to extraordinarily enhance the materialspecific phononic excitations of a nanometer-sized silica particle. We show that the bowtie geometry is especially suited for single-particle spectroscopy, as it combines the advantage of an intense electromagnetic hot spot, the size of which can be adjusted to the particle dimension, with easy positioning of ultrafine dust particles inside that hot spot. In agreement with numerical calculations, we show that a detection limit in terms of a particle diameter of less than 20 nm can be achieved, which corresponds to a ratio of the diameter to the vacuum wavelength below 0.002. Our approach offers the possibility of analyzing infrared bands from tiniest particles and thus paves the way toward SEIRA-based devices that can sense ultrafine dust.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Numerical Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemical Identification of Single Ultrafine Particles Using Surface-Enhanced Infrared Absorption

et al. 2019

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“…Our experiments are not done in a vacuum and so degradation effects cannot be avoided. However, in principle it is possible to determine the right optical data for the nanospheres and then to use them for simulations (e.g., Vogt et al 2017). This only makes sense if all experiments are done immediately after each other, which was impossible in this study in which the nanomanipulation and the spectroscopy at the synchrotron had to be done at different, predefined dates.…”

Section: Theoretical Approachesmentioning

confidence: 99%

Experimental verification of agglomeration effects in infrared spectra on micron-sized particles

Tamanai

Vogt

Huck

et al. 2018

A&A

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Context. Detailed analysis of observed infrared (IR) dust emission spectra is often performed in order to derive information about mineralogy, particle size, and temperature of the dust. However, the IR bands are also influenced by agglomeration of the dust particles. Light scattering theory simulating agglomeration and growth effects is especially challenged by the consideration of highly absorbing particles. Aims. To clarify the influence of agglomeration on the diagnostic phonon bands of amorphous SiO 2 particles, we experimentally measure the extinction spectra of systematically arranged particle configurations and compare the measured spectra with the spectra obtained from different theoretical approaches. Methods. We construct artificial particle agglomerates by means of the dedicated robotic manipulation (DRM) technique. IR microspectroscopic extinction measurements of these arranged particles are performed at the French National Synchrotron Facility, SOLEIL, in the mid-IR region considering polarization effects. The theoretical approaches applied are the discrete dipole approximation (DDA) as well as T-matrix and finite-difference time-domain methods. Results. In both the experimental spectra and the theoretical calculations, we find that the Si-O stretching vibration band at about 9 µm is clearly broadened on the long-wavelength side by the agglomeration of particles. This is mainly caused by the radiation components, which are polarized in directions in which the agglomerate is extended, while the extinction band profile of the component polarized perpendicular to the long axis of an elongated agglomerate is close to the spectrum of the single sphere. All of the theoretical simulations predict these effects in qualitatively good agreement. Conclusions. Our comparative study of the experimentally measured and theoretically calculated IR extinction spectra of well-defined agglomerate structures makes obvious how the various particle arrangements in small clusters might contribute to average spectra of dust. Therefore the study might help to improve the precision of light scattering calculations as well as their specific applicability.

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Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Lim

Manjappa

Pitchappa

et al. 2018

Advanced Optical Materials

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Advances in plasmonic metamaterials have been rapidly evolving with innovations aimed at developing metadevices for real-world applications. In reality, energy losses in plasmonic systems are prevalent and it is of paramount importance to come up with solutions that could overcome the limitations that impede further advancements toward the miniaturization of optoelectronic metadevices. High-Q Fano resonance as a scattering phenomenon can be easily triggered by introducing asymmetry into plasmonic systems, and thus it offers a simple approach for reducing radiative losses through lineshape engineering. High-Q Fano resonance possesses narrow linewidth and intensely confined electromagnetic fields, which makes it viable for widespread applications. The purpose of this review is to consolidate the current advances and contributions that high-Q Fano resonance has made in the metamaterial community. Two general modes of energy loss including radiative and nonradiative losses are introduced and possible ways to overcome these challenges are examined. Furthermore, applications based on high-Q Fano resonance including sensors, lasing spasers, and optical switches are discussed, embracing the future of Fano resonance based high performance photonic technologies.

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Chemical Identification of Individual Fine Dust Particles with Resonant Plasmonic Enhancement of Nanoslits in the Infrared

Cited by 21 publications

References 31 publications

Chemical Identification of Single Ultrafine Particles Using Surface-Enhanced Infrared Absorption

Chemical Identification of Single Ultrafine Particles Using Surface-Enhanced Infrared Absorption

Experimental verification of agglomeration effects in infrared spectra on micron-sized particles

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

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