Anapole-assisted giant electric field enhancement for surface-enhanced coherent anti-Stokes Raman spectroscopy

Ghahremani, Maryam; Habil, Mojtaba Karimi; Zapata–Rodríguez, Carlos J.

doi:10.1038/s41598-021-90061-5

Cited by 9 publications

(3 citation statements)

References 95 publications

(89 reference statements)

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“…In order to analyze the contributions of different multipoles and the formation of anapole state detailedly, the multipole expansion of scattering power and the corresponding phase of p and ikt are plotted, as shown in figure 4(c). Considering the main direction of the oscillating E-vector (y-axis) [56], the relationship of p = −ikt is used to define anapole wavelength. We introduce a vertical line to show the intersection wavelength of p and t and a horizontal line to show the anti-phase position.…”

Section: Oblique Incidence Anapole Excitation In a Nanodisk Arraymentioning

confidence: 99%

The anapole state excited by an oblique incidence

et al. 2023

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Anapole states supported by high-refractive-index dielectric nanoparticles have mostly been studied under normal incidence, but this work explores the oblique incidence excitation. For a single silicon nanodisk, as the incident angle (θ) increases, the anapole wavelength undergoes a gradual blueshift, while the wavelength of maximum near-field enhancement remains almost unchanged with increasing E-field enhancement factor (|E/E0|) due to phase retardation effect caused by oblique incidence, and some unique features in field distributions differed from normal excitation are exhibited. In the case of a silicon nanodisk array, the anapole state and near-field enhancement are affected by near-field coupling and the phase retardation effect is weakened. With increasing θ, the anapole wavelength and maximum field enhancement wavelength both blue shift. The y-direction coupling occurs in anapole wavelength and diagonal direction coupling occurs in the maximum field enhancement wavelength. Oblique incident excitation gives us a deeper understanding of anapole state and may have potential applications in nanophotonics.

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Section: Oblique Incidence Anapole Excitation In a Nanodisk Arraymentioning

confidence: 99%

The anapole state excited by an oblique incidence

et al. 2023

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“…Great efforts have been made to develop various types of nanostructured substrates, which are characterized by a high enhancement factor (EF) [ 48 , 49 , 87 , 88 , 89 ]. The most common materials for the formation of colloidal and solid substrates are silver and gold nanoparticles due to their unique optical and electronic properties, exhibiting plasmon resonance bands in a wide range of spectra from the visible to the near infrared.…”

Section: Application Of Sers and Sers-combined Raman Techniques In The Detection Of Biomoleculesmentioning

confidence: 99%

Raman Scattering-Based Biosensing: New Prospects and Opportunities

et al. 2021

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The growing interest in the development of new platforms for the application of Raman spectroscopy techniques in biosensor technologies is driven by the potential of these techniques in identifying chemical compounds, as well as structural and functional features of biomolecules. The effect of Raman scattering is a result of inelastic light scattering processes, which lead to the emission of scattered light with a different frequency associated with molecular vibrations of the identified molecule. Spontaneous Raman scattering is usually weak, resulting in complexities with the separation of weak inelastically scattered light and intense Rayleigh scattering. These limitations have led to the development of various techniques for enhancing Raman scattering, including resonance Raman spectroscopy (RRS) and nonlinear Raman spectroscopy (coherent anti-Stokes Raman spectroscopy and stimulated Raman spectroscopy). Furthermore, the discovery of the phenomenon of enhanced Raman scattering near metallic nanostructures gave impetus to the development of the surface-enhanced Raman spectroscopy (SERS) as well as its combination with resonance Raman spectroscopy and nonlinear Raman spectroscopic techniques. The combination of nonlinear and resonant optical effects with metal substrates or nanoparticles can be used to increase speed, spatial resolution, and signal amplification in Raman spectroscopy, making these techniques promising for the analysis and characterization of biological samples. This review provides the main provisions of the listed Raman techniques and the advantages and limitations present when applied to life sciences research. The recent advances in SERS and SERS-combined techniques are summarized, such as SERRS, SE-CARS, and SE-SRS for bioimaging and the biosensing of molecules, which form the basis for potential future applications of these techniques in biosensor technology. In addition, an overview is given of the main tools for success in the development of biosensors based on Raman spectroscopy techniques, which can be achieved by choosing one or a combination of the following approaches: (i) fabrication of a reproducible SERS substrate, (ii) synthesis of the SERS nanotag, and (iii) implementation of new platforms for on-site testing.

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“…Metasurfaces, which are two-dimensional (2D) planar systems consisting of artificially engineered subwavelength optical antennas, can facilitated precise manipulation of light waves with unanticipated manners 14 – 21 Currently, meta-optics have been demonstrated across the near-infrared to visible spectrum. Most of these systems rely on nanoscale antennas composed of dielectric or metallic materials, combined with the surrounding air medium, to establish a high refractive index contrast 22 .…”

Section: Introductionmentioning

confidence: 99%