FDTD modeling of photonic crystal-incorporated gold nanoparticles for enhancing the localized electric field

Mu, Zhongde; Gu, Hongcheng; Zhang, Bin; Zheng, Jiajun; Zhai, Zhenyu; He, Xia; Zhao, Yuanjin

doi:10.1039/c7tc03668j

Cited by 16 publications

(10 citation statements)

References 38 publications

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“…The electric field in the SERS substrate depends on AuNPs or the AuNP dimer, the diameter of AuNPs, the interval, and the location and orientation of the AuNP dimer. 49 Although the maximum electric field in SPCMs with AuNPs has not been investigated, the simulation resluts of electric field distributions show that SPCMs with AuNPs could remarkably enhance the SERS signal.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The electric field-enhancing effect in SPCMs with AuNPs is 7-times (Figure e,f), which is obviously higher than that in SPCMs without AuNPs (Figure a,b) and that of the AuNP dimer (Figure c,d). The electric field in the SERS substrate depends on AuNPs or the AuNP dimer, the diameter of AuNPs, the interval, and the location and orientation of the AuNP dimer . Although the maximum electric field in SPCMs with AuNPs has not been investigated, the simulation resluts of electric field distributions show that SPCMs with AuNPs could remarkably enhance the SERS signal.…”

Section: Results and Discussionmentioning

confidence: 99%

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A Novel Multiplex Mycotoxin Surface-Enhanced Raman Spectroscopy Immunoassay Using Functional Gold Nanotags on a Silica Photonic Crystal Microsphere Biochip

Sun

Zhu

et al. 2021

J. Agric. Food Chem.

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A novel multiplex mycotoxin surface-enhanced Raman spectroscopy (SERS) immunoassay was established for the first time on different artificial antigen-modified silica photonic crystal microspheres (SPCMs), which can be integrated into a biochip array to achieve multiplex detection using corresponding antibody-functionalized gold nanoparticles (AuNPs) as the SERS nanotag. The unique optical structure of SPCMs is helpful to find the detection spots easily, accommodate a large amount of probe molecules, and enhance the Raman signal intensity. Such enhancement was confirmed by the simulation result, showing the electric field enhancing effect in SPCMs with AuNPs being 7 times. A competitive SERS immunoassay was established using antigenmodified SPCMs and mycotoxins to compete for binding antibody-functionalized SERS nanotags, displaying broad linear detection ranges of 0.001−0.1 ng/mL for aflatoxin B 1 (AFB 1 ), 0.01−10 ng/mL for ochratoxin A (OTA), and 0.001−0.1 ng/mL for zearalenone (ZEN) and low detection limits of 0.82 pg/mL for AFB 1 , 1.43 pg/mL for OTA, and 1.00 pg/mL for ZEN. In the spiked cereal samples, recovery rates of the method were measured in the range of 70.35−118.04% for the three mycotoxins, which was in agreement with that of the traditional enzyme-linked immunosorbent assay method. The SERS immunoassay for mycotoxin detection also showed high specificity and good repeatability and reproducibility. The new microsphere-based SERS immunoassay biochip only requires a one-step reaction and overcomes the disadvantages of fluorescence and chemiluminescence background signals. The work paves the way for further developing SERS-based microsphere suspension arrays for new targets.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

A Novel Multiplex Mycotoxin Surface-Enhanced Raman Spectroscopy Immunoassay Using Functional Gold Nanotags on a Silica Photonic Crystal Microsphere Biochip

Sun

Zhu

et al. 2021

J. Agric. Food Chem.

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“…PhC enhancement includes strong absorption or reflection at specific wavelengths in the far-field and rearrangement of the electric field in the near-field. Typical examples are PhC enhanced light harvesting, [10][11][12] PhC enhanced catalysis, [13,14] PhC enhanced Raman spectroscopy, [15][16][17][18][19] PhC enhanced fluorescence spectroscopy, [17,20,21] PhC enhanced upconversion, [22,23] etc. [24][25][26] More specifically, Wen Xu and Hongwei Song reported that with the guidance of theoretical simulation, the plasmonic effect combined PhC effect enhanced the fluorescence of CsPbCl 3 by ≈150-fold.…”

Section: Introductionmentioning

confidence: 99%

FDTD Modeling of Au/Ag Nanoparticles Incorporated Au/Ag Photonic Crystal for Seeking the Maximal Localized Electric Field

Chen

et al. 2022

Advcd Theory and Sims

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Photonic crystals (PhC) can be elaborately tailored to enhance the electromagnetic properties of materials and are drawing increasing attention in recent years. However, there is no sufficient theoretical framework to optimize photonic crystal designs for electric enhancement. A comprehensive theoretical model is presented to illustrate Au/Ag photonic crystal enhancement on electric fields and obtain a group of optimal photonic crystal parameters after large number of statistics and parameter scans. The second and deeper layers of PhC only contribute to both 5% extinction and absorption in the far-field, and there is almost no difference in |E| max among different layers with the coefficient variation at ≈1%. Furthermore, increment of both lattice constants and NP diameters can trigger dramatic changes in |E| max , and the maximal |E| max derived from 190 nm AuNP (nanoparticle)-Au PhC with the lattice constant of 560 nm. This structure is 47.7, 7.39, 4.63, and 2.69 times that of AuNP incorporated silica wafer, silicon wafer, Ag wafer, and Au wafer, respectively. The strong electric field enhancement attributes to not only the plasmonic effect but also the photonic crystal enhancement effect.The simulation procedures open the possibility of precise photonic crystal structure design and pave the way for various electric field enhancement applications.

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“…Till now, only a few studies 23−25 have shown the fabrication of SERS-active substrates with both LSPR (resulting from the noble metal nanoparticles/2D nanoarrays/3D nanostructures) and PSB properties (resulting from the PC structures) to improve the enhanced EM field synergistically, thereby leading to a further enhanced SERS intensity. EM modeling of a bioinspired PC structure incorporated with Au nanocrystals for enhancing the localized electric field was explored by Zheng et al 26 They showed that the Auincorporated system can produce a stronger EM field due to the presence of the PC structure. Franzl et al 25 have reported an SERS-active substrate by covering a one-dimensional PC with ordered metal nanoparticle arrays by electrochemical etching and the nanosphere lithography method, exhibiting a significant interaction of the plasmonic resonance with the PSB.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Nanocrystal Arrays on Photonic Crystals with Tailored Optical Resonances

Wang

Le‐The

Karamanos

et al. 2020

ACS Appl. Mater. Interfaces

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Hierarchical plasmonic–photonic microspheres (PPMs) with high controllability in their structures and optical properties have been explored toward surface-enhanced Raman spectroscopy. The PPMs consist of gold nanocrystal (AuNC) arrays (3rd-tier) anchored on a hexagonal nanopattern (2nd-tier) assembled from silica nanoparticles (SiO 2 NPs) where the uniform microsphere backbone is termed the 1st-tier. The PPMs sustain both photonic stop band (PSB) properties, resulting from periodic SiO 2 NP arrangements of the 2nd-tier, and a surface plasmon resonance (SPR), resulting from AuNC arrays of the 3rd-tier. Thanks to the synergistic effects of the photonic crystal (PC) structure and the AuNC array, the electromagnetic (EM) field in such a multiscale composite structure can tremendously be enhanced at certain wavelengths. These effects are demonstrated by experimentally evaluating the Raman enhancement of benzenethiol (BT) as a probe molecule and are confirmed via numerical simulations. We achieve a maximum SERS enhancement factor of up to ∼10 8 when the resonances are tailored to coincide with the excitation wavelength by suitable structural modifications.

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FDTD modeling of photonic crystal-incorporated gold nanoparticles for enhancing the localized electric field

Abstract: Simulations elucidated that with the aid of photonic crystal, AuNP(s) induced stronger localized electric field than AuNP(s) alone.

Cited by 16 publications

References 38 publications

A Novel Multiplex Mycotoxin Surface-Enhanced Raman Spectroscopy Immunoassay Using Functional Gold Nanotags on a Silica Photonic Crystal Microsphere Biochip

A Novel Multiplex Mycotoxin Surface-Enhanced Raman Spectroscopy Immunoassay Using Functional Gold Nanotags on a Silica Photonic Crystal Microsphere Biochip

FDTD Modeling of Au/Ag Nanoparticles Incorporated Au/Ag Photonic Crystal for Seeking the Maximal Localized Electric Field

Plasmonic Nanocrystal Arrays on Photonic Crystals with Tailored Optical Resonances

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