Infrared Aluminum Metamaterial Perfect Absorbers for Plasmon‐Enhanced Infrared Spectroscopy

Chen, Kai; Dao, Thang Duy; Ishii, Satoshi; Aono, Masakazu; Nagao, Tadaaki

doi:10.1002/adfm.201501151

Cited by 135 publications

(83 citation statements)

References 44 publications

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“…We utilized such facile tuning methods and investigated their performances as SEIRA substrates. Recently, Al nanostructures or metamaterials have received a lot of attention to study the possibility of using Al as alternative plasmonic materials10383940. Here we directly compared the SEIRA signals from Poly(methyl methacrylate) (PMMA) thin films coated on top of Al and Au nanotriangles and the results are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Tunable Nanoantennas for Surface Enhanced Infrared Absorption Spectroscopy by Colloidal Lithography and Post-Fabrication Etching

Chen

Dao

Nagao

2017

Sci Rep

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We fabricated large-area metallic (Al and Au) nanoantenna arrays on Si substrates using cost-effective colloidal lithography with different micrometer-sized polystyrene spheres. Variation of the sphere size leads to tunable plasmon resonances in the middle infrared (MIR) range. The enhanced near-fields allow us to detect the surface phonon polaritons in the natural SiO2 thin layers. We demonstrated further tuning capability of the resonances by employing dry etching of the Si substrates with the nanoantennas acting as the etching masks. The effective refractive index of the nanoantenna surroundings is efficiently decreased giving rise to blueshifts of the resonances. In addition, partial removal of the Si substrates elevates the nanoantennas from the high-refractive-index substrates making more enhanced near-fields accessible for molecular sensing applications as demonstrated here with surface-enhanced infrared absorption (SEIRA) spectroscopy for a thin polymer film. We also directly compared the plasmonic enhancement from the Al and Au nanoantenna arrays.

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Section: Resultsmentioning

confidence: 99%

Tunable Nanoantennas for Surface Enhanced Infrared Absorption Spectroscopy by Colloidal Lithography and Post-Fabrication Etching

Chen

Dao

Nagao

2017

Sci Rep

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“…In this section, we provide overviews and highlight the key concepts of the next generation of mid-IR absorption www.advopticalmat.de spectroscopies in designing various IR resonant antennas with different geometries [36,[42][43][44] and new materials, including aluminum, [45,46] graphene, [47,48] and dielectric materials. [49,50] In Figure 3a, Fano-resonant asymmetric metamaterials show strong near-field enhancement at the gap as well as sharp spectral features, operating in the mid-IR range.…”

Section: Next Generation Of Mid-ir Absorption Spectroscopiesmentioning

confidence: 99%

Terahertz Biochemical Molecule‐Specific Sensors

Seo

Park

2019

Advanced Optical Materials

114

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The terahertz (THz) spectrum is the focus of basic research in solid‐state physics, chemistry, and materials science as well as applications in next‐generation communications, far‐infrared bolometer, bio/chemical‐sensing, and medical imaging. This wavelength range is at the intersection between photonics and electronics, presenting tremendous opportunities to boost fundamental light–matter interactions enabled by plasmonic nanostructures, metamaterials, and inherent molecular vibrational modes, which occur on time scales of tens of femtoseconds to picoseconds. Recently, engineered metamaterials have presented unique platforms for sensing applications due to their ability to boost such light–matter interactions on the nanoscale and to their spectral selectivity in a wide range from the mid‐infrared to the THz region. Their resonant response can be tuned to that of the intra‐ and intermolecular vibrational modes of target bio/chemical molecules. The emerging fields of highly sensitive and selective mid‐infrared and THz spectroscopies based on metamaterials and plasmonic nanostructures are reviewed. Furthermore, practical applications of these next generation spectroscopic sensors are also discussed, where the sensor platforms will lead to a great impact in the advancement of ultrasmall‐quantity detection of explosives, nondestructive inspection of hazardous materials, food safety, and conformational dynamics of biomolecules in their aqueous environment.

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“…An alternative shape of the nanoantennas, namely, disks, was employed to design the PAs for SEIRS in Ref. [136]. Chen et al used the layer stack Al/Al 2 O 3 /Al and nanosphere lithography to structure the Al top layer to spheres with a hexagonal lattice.…”

Section: Metal-insulator-metal Structuresmentioning

confidence: 99%

Periodic array-based substrates for surface-enhanced infrared spectroscopy

Mayerhöfer

Popp

2017

Nanophotonics

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At the beginning of the 1980s, the first reports of surface-enhanced infrared spectroscopy (SEIRS) surfaced. Probably due to signal-enhancement factors of only 10 1 to 10 3 , which are modest compared to those of surface-enhanced Raman spectroscopy (SERS), SEIRS did not reach the same significance up to date. However, taking the compared to Raman scattering much larger crosssections of infrared absorptions and the enhancement factors together, SEIRS reaches about the same sensitivity for molecular species on a surface in terms of the crosssections as SERS and, due to the complementary nature of both techniques, can valuably augment information gained by SERS. For the first 20 years since its discovery, SEIRS relied completely on metal island films, fabricated by either vapor or electrochemical deposition. The resulting films showed a strong variance concerning their structure, which was essentially random. Therefore, the increase in the corresponding signal-enhancement factors of these structures stagnated in the last years. In the very same years, however, the development of periodic array-based substrates helped SEIRS to gather momentum. This development was supported by technological progress concerning electromagnetic field solvers, which help to understand plasmonic properties and allow targeted design. In addition, the strong progress concerning modern fabrication methods allowed to implement these designs into practice. The aim of this contribution is to critically review the development of these engineered surfaces for SEIRS, to compare the different approaches with regard to their performance where possible, and report further gain of knowledge around and in relation to these structures.

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Infrared Aluminum Metamaterial Perfect Absorbers for Plasmon‐Enhanced Infrared Spectroscopy

Cited by 135 publications

References 44 publications

Tunable Nanoantennas for Surface Enhanced Infrared Absorption Spectroscopy by Colloidal Lithography and Post-Fabrication Etching

Tunable Nanoantennas for Surface Enhanced Infrared Absorption Spectroscopy by Colloidal Lithography and Post-Fabrication Etching

Terahertz Biochemical Molecule‐Specific Sensors

Periodic array-based substrates for surface-enhanced infrared spectroscopy

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