Plasmon-Coupled Whispering Gallery Modes on Nanodisk Arrays for Signal Enhancements

Kang, Tae Young; Lee, Won-Ju; Ahn, Heesang; Shin, Dong‐Myeong; Kim, Chang Seok; Oh, Jin Woo; Kim, Dong-Hyun; Kim, Kyujung

doi:10.1038/s41598-017-12053-8

Cited by 20 publications

(14 citation statements)

References 48 publications

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“…Similar to the double resonance between localized plasmon and SPP, their evanescent fields are coupled. In contrast, since the evanescent field of a WGM is longer ranged, its coupling with the field of localized plasmon is expectantly smaller …”

Section: Resultsmentioning

confidence: 98%

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Double Resonance SERS Substrates: Ag Nanoparticles on Grating

Chang

Dvoynenko

et al. 2021

J. Phys. Chem. C

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Silver nanoparticles grown in nanochannels of anodic aluminum oxide on a grating form a surface-enhanced Raman scattering (SERS) substrate with the double resonance from both localized and delocalized plasmons. With angle-resolved reflectance spectroscopy, we characterized the propensity of surface plasmon polariton (SPP) of the grating and confirmed it with electrodynamic simulation. In addition to the hot spots created between adjacent silver nanoparticles, the extra SERS enhancement engendered by the grating's SPP manifested as the enhancement band over a range of detection angles. The SERS signal of thiophenol obtained with transverse-magnetic excitation showed a gain by a factor of 2, which is comparable with the one estimated from local-field simulation. The electrodynamic simulation showed that the most normally directed local field at the surface may limit the field enhancement of localized plasmonic coupling between silver nanoparticles. With the incorporation of grating, the enhanced SERS signals are inherently wavelength-dispersed, thus enabling simpler designs of SERS-based sensors without a spectrometer.

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Section: Resultsmentioning

confidence: 98%

“…In contrast, since the evanescent field of a WGM is longer ranged, its coupling with the field of localized plasmon is expectantly smaller. 47…”

Section: Resultsmentioning

confidence: 99%

Double Resonance SERS Substrates: Ag Nanoparticles on Grating

Chang

Dvoynenko

et al. 2021

J. Phys. Chem. C

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“…Because of the effects of plasmonic enhancement, the microfiber sensor showed a dramatic blue shift with increasing RH. The shift in the resonant wavelength is given by where ε is the cavity permittivity, E is the WGM electric field strength, and V is the optical mode volume of the resonator.…”

Section: Results and Discussionmentioning

confidence: 99%

Single-Mode Lasing in Plasmonic-Enhanced Woven Microfibers for Multifunctional Sensing

et al. 2021

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Single-mode plasmonic lasing has great potential for use in photonic and sensing applications. In this work, single-mode lasing is realized using a plasmonic-enhanced woven microfiber that shows ultrahigh sensitivity to the ambient environment. This plasmonic-enhanced microfiber is fabricated by spraying Ag nanospheres onto rhodamine 6G-doped polymer microfibers. Single-mode laser emission with an ultranarrow linewidth (0.1 nm) and a low threshold (18.8 kW/ mm 2 ) is achieved in the microfiber using the effects of mode selection and plasmonic enhancement provided by the Ag nanospheres. A large wavelength shift in the singlemode lasing is observed when the proposed laser is used as a sensor and exposed to a humid or acidic environment. The wavelength shift is attributed to refractive index variations in the microfiber caused by either moisture absorption or chemical reactions. In humidity sensing, the laser's sensitivity is as high as 826.6 pm/% relative humidity (RH) and the detection limit is 0.051% RH. An innovative strategy for acetic acid gas sensing is proposed that uses the chemical reaction with rhodamine 6G, and its minimum response time is 5 min. Because of the microfiber's excellent fabric compatibility, a wearable sensor is fabricated by weaving the plasmonic-enhanced microfiber into clothes, and this sensor demonstrates extreme bending stability. The results reported here provide a novel approach to the design and fabrication of ultrasensitive wearable sensors for multifunctional sensing applications.

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“…For the former, the dielectric nanoparticle or microsphere enhances the E -field incident on the plasmonic component . Kang et al fabricated optoplasmonic complexes by positioning dielectric microspheres (diameter > 10 μm) on top of gold nanodimers and observed enhanced sensitivity with whispering gallery mode (WGM) biosensors in these hybrid structures . Gartia et al studied the amplified Raman signal of dyes tethered to a WGM resonator located on top of a plasmonic surface, which is induced by an injection-seeding process .…”

Section: Introductionmentioning

confidence: 99%

Optoplasmonic Hybrid Materials for Trace Detection of Methamphetamine in Biological Fluids through SERS

Yan

Zhou

Xu³

et al. 2020

ACS Appl. Mater. Interfaces

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Optoplasmonic materials comprising both photonic and plasmonic elements are of particular interest for the development of substrates for surface-enhanced Raman spectroscopy (SERS). In this work, a layer of analyte-carrying dielectric nano/microspheres is placed on top of a monolayer of gold nanoparticles to enhance the intensity of the electric (E-) field localization and to enrich the analyte close to the electromagnetic hot spots. Numerical simulations of the hybrid structure confirm an increased and spatially expanded E-field enhancement at the interface. Due to a decreasing filling fraction with increasing size of the dielectric spheres, simulations predict a saturated SERS enhancement for dielectric microspheres with a diameter larger than 4 μm, which is confirmed by experimental SERS measurements. The dielectric microsphere can be functionalized with surface ligands that facilitate the binding of target molecules in solution. The deposition of the analyte-loaded microspheres on the self-assembled gold nanoparticle ensures a high local concentration of analytes in the electromagnetic “hot” surface. The performance of the optoplasmonic SERS approach for detecting methamphetamine in saliva and urine is tested, and the detection of analytes at nanomolar (nM) concentrations is demonstrated.

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Plasmon-Coupled Whispering Gallery Modes on Nanodisk Arrays for Signal Enhancements

Cited by 20 publications

References 48 publications

Double Resonance SERS Substrates: Ag Nanoparticles on Grating

Double Resonance SERS Substrates: Ag Nanoparticles on Grating

Single-Mode Lasing in Plasmonic-Enhanced Woven Microfibers for Multifunctional Sensing

Optoplasmonic Hybrid Materials for Trace Detection of Methamphetamine in Biological Fluids through SERS

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