Standing-wave resonances in plasmonic nanoumbrella cavities for color generation and colorimetric refractive index sensor

Fan, Jiaorong; Li, Zhongyuan; Chen, Zhuojie; Wu, Wengang

doi:10.1016/j.apsusc.2016.05.127

Cited by 18 publications

(12 citation statements)

References 34 publications

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“…It will further prove that the hybridized resonance can enhance the eld connement of the reected light. 25 According to the standingwave resonance mode, energy connement in the nanocavity can arouse a signicant resonance narrowing. 25 In order to provide better quantication, the gure-of-merit (FOM) is another important factor used to determine the capability of a chemical sensor.…”

Section: Resultsmentioning

confidence: 99%

“…The lower intensity of reective of peak_1 in PND-2 could be explained by the deeper etching condition with around 500 nm of the total height; moreover, the blue-shi is also known to be caused by the deeper structure. 25 The SiO 2 /Si, which is the dielectric/semiconductor layer, may give rise to the second type of surface plasmon, which is shown in Fig. 4 as peak_2 in PND-2.…”

Section: Methodsmentioning

confidence: 99%

“…6 In particular, the metal-dielectric-metal (MDM) multilayer nanostructure by coupling exotic medium is of growing interest. 7,8 MDM structures are a class of photonic metamolecules, 9 which can support the propagation of the gap plasmon polariton (GPP) mode resulting from the coupling effect of surface polaritons, 10,11 which can achieve the subwavelength connement of light and have important applications in nanoscale optical circuits 11 and enhanced optical intensity. 12 The plasmonic resonance behavior in the visible-light region, 7 near-infrared (NIR) region 13 and even in the terahertz (THz) region 14 have been demonstrated by various metal patterns to enhance the analyte sensitivity, which show that the resonance position is very sensitive on the dielectric surrounding medium.…”

Section: Introductionmentioning

confidence: 99%

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Narrow band resonance in the UV light region of a plasmonic nanotextured surface used as a refractive index sensor

2017

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Narrow band resonance in the UV light region of a plasmonic nanotextured surface used as a refractive index sensor

2017

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“…Due to their advantages in terms of large field enhancement and a straightforward fabrication method, vertical MIM structures, which consist of ordered nanodisc arrays on a gold film, separated by a thin dielectric layer, have attracted great attention in scientific research 8a,11. Many groups have been concentrating on the theory of cavity plasmon modes and concluded that these modes result from the interplay of plasmonic modes and Fabry–Pérot cavities defined by the MIM structure 11a,b,e,12,13…”

Section: Introductionmentioning

confidence: 99%

“…The cavity plasmon modes in vertical MIM structures have been exploited in applications such as structural colors,11a,b,d photovoltaics, narrow‐band perfect absorbers, enhancing the spontaneous emission rate of dyes, and enhanced infrared absorption . It has been widely shown that the cavity plasmon modes in vertical MIM structures show strongly enhanced and confined EM fields.…”

Section: Introductionmentioning

confidence: 99%

Accessing the Hotspots of Cavity Plasmon Modes in Vertical Metal–Insulator–Metal Structures for Surface Enhanced Raman Scattering

Dai

Horrer

Adam

et al. 2020

Advanced Optical Materials

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enhance the Raman scattering. [2,3] This process is called surface enhanced Raman scattering (SERS). The enhancement factor (EF) of SERS substrates is known to result from both electromagnetic and chemical enhancement. [4] It is widely acknowledged that the electromagnetic enhancement of plasmonic structures is the main EF contribution. The EF can be estimated by EF | | | | laser 2 Raman, where E  laser and E  Raman represent the field enhancement at the excitation (laser) wavelength and reemission (Raman) wavelength. [4] The near-field of plasmonic nanostructures can be particularly strong, when the field is concentrated in very small volumes. These socalled hotspots can occur, e.g., at the sharp tips of nanocones [2b] or in the gaps between different structures in a plasmonic multimer. Thus, in order to boost the enhancement of local electromagnetic (EM) fields, nanostructures with gaps on the scale of few nanometers, such as homodimers, [5] heterodimers, [6] trimers, [7] and vertical metal-insulator-metal (MIM) structures [8] were investigated extensively.In the case of lateral dimers or oligomers, the hotspots in the gaps between the single structures are readily accessible for detecting molecules. However, narrow gaps smaller than 10 nm are of poor reproducibility limited by the resolution of e-beam lithography (EBL). [5] On the contrary, vertical MIM structures with gaps down to the sub-nanometer scale can be obtained with thin film techniques such as atomic layer deposition (ALD) with high tunability and reproducibility. [9] Furthermore, a reproducible realization of gaps larger than 5 nm can be readily obtained with sufficient accuracy of the film thickness by established techniques such as evaporation or sputtering. [10] Due to their advantages in terms of large field enhancement and a straightforward fabrication method, vertical MIM structures, which consist of ordered nanodisc arrays on a gold film, separated by a thin dielectric layer, have attracted great attention in scientific research. [8a,11] Many groups have been concentrating on the theory of cavity plasmon modes and concluded that these modes result from the interplay of plasmonic modes and Fabry-Pérot cavities defined by the MIM structure. [11a,b,e,12,13] The cavity plasmon modes in vertical MIM structures have been exploited in applications such as structural colors, [11a,b,d] photovoltaics, [13] narrow-band perfect absorbers, [14] enhancing the spontaneous emission rate of dyes, [15] and enhanced infrared absorption. [16] It has been widely shown that the cavity In metal-insulator-metal structures such as Au nanodiscs on an Au film separated by a thin oxide spacer layer, the metal/insulator interfaces can form a Fabry-Perot cavity in which gap surface plasmons are confined. As a result, these cavity plasmon modes show the advantageous properties of strong field enhancement and very narrow resonance line shapes due to the confinement in a cavity. In this work, the hotspots of the electromagnetic near-field of cavity plasmon modes ar...

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Plasmonic Metasurfaces Based on Nanopin-Cavity Resonator for Quantitative Colorimetric Ricin Sensing

Fan

Zhu

et al. 2016

Small

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In view of the toxic potential of a bioweapon threat, rapid visual recognition and sensing of ricin has been of considerable interest while remaining a challenging task up to date. In this study, a gold nanopin-based colorimetric sensor is developed realizing a multicolor variation for ricin qualitative recognition and analysis. It is revealed that such plasmonic metasurfaces based on nanopin-cavity resonator exhibit reflective color appearance, due to the excitation of standing-wave resonances of narrow bandwidth in visible region. This clear color variation is a consequence of the reflective color mixing defined by different resonant wavelengths. In addition, the colored metasurfaces appear sharp color difference in a narrow refractive index range, which makes them especially well-suited for sensing applications. Therefore, this antibody-functionalized nanopin-cavity biosensor features high sensitivity and fast response, allowing for visual quantitative ricin detection within the range of 10-120 ng mL (0.15 × 10 -1.8 × 10 m), a limit of detection of 10 ng mL , and the typical measurement time of less than 10 min. The on-chip integration of such nanopin metasurfaces to portable colorimetric microfluidic device may be envisaged for the quantitative studies of a variety of biochemical molecules.

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Standing-wave resonances in plasmonic nanoumbrella cavities for color generation and colorimetric refractive index sensor

Cited by 18 publications

References 34 publications

Narrow band resonance in the UV light region of a plasmonic nanotextured surface used as a refractive index sensor

Narrow band resonance in the UV light region of a plasmonic nanotextured surface used as a refractive index sensor

Accessing the Hotspots of Cavity Plasmon Modes in Vertical Metal–Insulator–Metal Structures for Surface Enhanced Raman Scattering

Plasmonic Metasurfaces Based on Nanopin-Cavity Resonator for Quantitative Colorimetric Ricin Sensing

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