Robust plasmonic hot-spots in a metamaterial lattice for enhanced sensitivity of infrared molecular detection

Ishikawa, Atsushi; Hara, Shuhei; Tanaka, Takuo; Zhang, Xiang; Tsuruta, Kenji

doi:10.1063/1.5004703

Cited by 8 publications

(4 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A wide variety of materials, fabrication methods, and nanoparticle shapes have been developed to improve the signal enhancement in SEIRA 10 – 19 ; however, long-wavelength SEIRA (beyond 700 cm ) has developed more slowly due to the scarcity of transparent substrate materials, lower signal levels, more costly sources/detectors, and difficulties making use of plasmonic resonant nanoparticle field enhancement at these wavelengths. The natural plasmonic effect is unable to miniaturize resonators at these wavelengths, which leads to large inter-particle distances and a low density of electric-field hotspots.…”

Section: Introductionmentioning

confidence: 99%

Surface-enhanced mid-infrared absorption spectroscopy using miniaturized-disc metasurface

Semple

Iyer

2021

Sci Rep

View full text Add to dashboard Cite

Surface-enhanced infrared spectroscopy is an important technique for improving the signal-to-noise ratio of spectroscopic material identification measurements in the mid-infrared fingerprinting region. However, the lower bound of the fingerprinting region receives much less attention due to a scarcity of transparent materials, more expensive sources, and weaker plasmonic effects. In this paper, we present a miniaturized metasurface unit cell for surface-enhanced infrared spectroscopy of the 15-$$\upmu$$ μ m vibrational band of CO$$_{2}$$ 2 . The unit cell consists of a gold disc, patterned along the edge with fine gaps/wires to create a resonant metamaterial liner. In simulation, our plasmonic metamaterial-lined disc achieves greater than $$4\times$$ 4 × the average field intensity enhancement of a comparable dipole array and a miniaturized size of $$\lambda _0/5$$ λ 0 / 5 using complex, 100-nm features that are patterned using 100-kV electron-beam lithography. In a simple experiment, the metamaterial-lined disc metasurface shows a high tolerance to fabrication imperfections and enhances the absorption of CO$$_{2}$$ 2 at 15 $$\upmu$$ μ m. The resonant wavelength and reflection magnitude can be tuned over a wide range by adjusting the liner feature sizes and the metasurface array pitch to target other vibrational bands. This work is a step toward low-cost, more compact on-chip integrated gas sensors.

show abstract

Section: Introductionmentioning

confidence: 99%

Surface-enhanced mid-infrared absorption spectroscopy using miniaturized-disc metasurface

Semple

Iyer

2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Metamaterials are systems where the separation between the macrostructure and the constituent material has been washed out to gain new functionality. 2D metamaterials with selected nanostructured components can exhibit remarkable mechanical, transport, optical, and electromagnetic properties [1][2][3][4]. Whereas isolated constituent nanostructures should be considered as quantum dots, aggregates of such nanostructures may display intriguing physical behavior.…”

Section: Introductionmentioning

confidence: 99%

Strain-controlled magnetic ordering in 2D carbon metamaterials

Liu

Kim

Weck

et al. 2020

Carbon

View full text Add to dashboard Cite

We use ab initio spin-polarized density functional theory to study the magnetic order in a Kagomé-like 2D metamaterial consisting of pristine or substitutionally doped phenalenyl radicals polymerized into a nanoporous, graphene-like structure. In this and in a larger class of related structures, the constituent polyaromatic hydrocarbon molecules can be considered as quantum dots that may carry a net magnetic moment. The structure of this porous system and the coupling between the quantum dots may be changed significantly by applying moderate strain, thus allowing to control the magnetic order and the underlying electronic structure.

show abstract

“…These properties have attracted much attention in past decades. Many kinds of metallic nanostructures have been reported to support Fano resonance, such as ring/disk cavity [7,9,11], nano-shell [12][13][14], split ring [15][16][17], dolmen [18][19][20] and oligomers [21][22][23][24][25][26][27], for practical applications such as surface enhanced infrared absorption [28][29][30], surface enhanced Raman scattering [31,32] and enhanced second harmonic generation [33][34][35][36][37] and third harmonic generation [19].…”

Section: Introductionmentioning

confidence: 99%

Strongly coupled evenly divided disks: a new compact and tunable platform for plasmonic Fano resonances

et al. 2020

View full text Add to dashboard Cite

Plasmonic artificial molecules are promising platforms for linear and nonlinear optical modulation at various regimes including the visible, infrared and terahertz bands. Fano resonances in plasmonic artificial structures are widely used for controlling spectral lineshapes and tailoring of near-field and far-field optical response. Generation of a strong Fano resonance usually relies on strong plasmon coupling in densely packed plasmonic structures. Challenges in reproducible fabrication using conventional lithography significantly hinders the exploration of novel plasmonic nanostructures for strong Fano resonance. In this work, we propose a new class of plasmonic molecules with symmetric structure for Fano resonances, named evenly divided disk, which shows a strong Fano resonance due to the interference between a subradiant anti-bonding mode and a superradiant bonding mode. We successfully fabricated evenly divided disk structures with high reproducibility and with sub-20 nm gaps, using our recently developed sketch and peel lithography technique. The experimental spectra agree well with the calculated response, indicating the robustness of the Fano resonance for the evenly divided disk geometry. Control experiments reveal that the strength of the Fano resonance gradually increases when increasing the number of split parts on the disk from three to eight individual segments. The Fano-resonant plasmonic molecules that can also be reliably defined by our unique fabrication approach open up new avenues for application and provide insight into the design of artificial molecules for controlling light-matter interactions.

show abstract

Robust plasmonic hot-spots in a metamaterial lattice for enhanced sensitivity of infrared molecular detection

Cited by 8 publications

References 45 publications

Surface-enhanced mid-infrared absorption spectroscopy using miniaturized-disc metasurface

Surface-enhanced mid-infrared absorption spectroscopy using miniaturized-disc metasurface

Strain-controlled magnetic ordering in 2D carbon metamaterials

Strongly coupled evenly divided disks: a new compact and tunable platform for plasmonic Fano resonances

Contact Info

Product

Resources

About