Theoretical study of surface plasmonic refractive index sensing based on gold nano-cross array and gold nanofilm

Chen, Hanwen; Wang, Xiangxian; Zhang, Jian; Rao, Xijun; Yang, Hua; Qi, Yunping; Tang, Chaojun

doi:10.1016/j.physb.2023.414746

Cited by 22 publications

(5 citation statements)

References 32 publications

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“…The light at a metal-insulator (MI) interface causes free electrons to oscillate, generating SPPs when the oscillation reaches the resonant frequency. The light field energy of SPPs is mainly concentrated at the MI interface and decays exponentially in the vertical direction [1,2]. Therefore, SPPs overcome the aforementioned limitation and facilitate the transmission of light waves at sub-wavelength sizes, thereby enabling the miniaturization of photonic devices [3,4].…”

Section: Introductionmentioning

confidence: 99%

Multiple Fano resonances by MIM waveguide coupling whispering gallery mode resonator and application in Refractive index sensing

Gao,

Wang,

Chen

et al. 2024

Phys. Scr.

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In this study, a baffled metal – insulator – metal (MIM) waveguide coupled with a whispering gallery mode resonator (WGMR) is proposed. This structure could excite quadruple Fano resonances. The asymmetric Fano resonance transmittance spectrum and the electric field at the resonance peak were numerically simulated using the finite difference time domain method. The obtained data were fitted using the multimode interference coupled mode theory. The number of Fano resonance peaks was tuned by the outer radius of the WGMR. With other geometric parameters unchanged, the number of Fano resonance peaks increased with increasing outer radius of the WGMR. When the ring width was fixed, the structure could excite multiple Fano resonances within a certain outer radius range. This structure was used for refractive index sensing and its sensitivity and figure of merit (FOM) were 3004 nm/RIU and 3.14× 104 in a gas environment, respectively. Therefore, the proposed structure can excite multiple Fano resonances and achieve a high sensitivity and FOM, providing a theoretical basis for micro and nano applications.

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Section: Introductionmentioning

confidence: 99%

Multiple Fano resonances by MIM waveguide coupling whispering gallery mode resonator and application in Refractive index sensing

Gao,

Wang,

Chen

et al. 2024

Phys. Scr.

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“…There is a sweet spot where the geometric parameters don't affect the composite's sensing capability too much. The numerical results reveal that in gas conditions, the maximal RI sensitivity and figure of merit (FOM) are 872 nm/RIU and 97 RIU −1 , while in liquid situations, they are 880 nm/RIU and 98 RIU -1 [8]. Silver plasmonic nanostructures were simulated, analyzed, and synthesized for biomolecule detection.…”

Section: -Introductionmentioning

confidence: 99%

“…Figures 7,8,9,10,11,12 depicts the cross-section of the spectrum of an Ag homo-dimer with a 25 nm radius, the position of the resonance wavelength is insensitive to the interparticle space, and the highest peak position is approximately 395 nm when irradiated with y-polarization incidence light. However, Z-polarization light irradiation red-shifts the resonance wavelength as the interparticle space expands.…”

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confidence: 99%

Study the Sensing Properties of Gold, Silver, and Aluminium Coupling Plasmon Nano-Sphere and Homo-Dimers

Hadi,

Naji,

Khalee

et al. 2024

Preprint

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FDTD simulations are used to investigate the homo- dimer nanostructures as localized surface plasmon resonance when the predicted LSPR wavelengths of Ag, Au, and Al nanospheres in a homo-dimer arrangement are equated, the findings show that the Ag and Al homo-dimer exhibits a higher LSPR shift than the Au homo-dimer. Enhancements in intensity are brought about in the junction as a result of the interaction between the homo-dimer nanoparticle and it. It has been determined that the field enhancement for homo-dimer nanostructures composed of gold, silver, and aluminum has been compared, and theoretically, values in the visible range of DU.v-U.v. have been projected to be between 108 and 109.

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“…Localized surface plasmons (LSPs) are essentially understood as collective oscillations of free electrons in nanostructured metals [1][2][3] and other conductive materials [4][5][6], which have been extensively investigated and applied in optoelectronic devices [7][8][9][10][11][12] and sensors [13][14][15][16]. Local-field and light-scattering enhancement by LSPs have been utilized in photovoltaic diodes [7,8], light-emitting devices [9,10], and various type of lasers [11,12].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Autocorrelation of Localized Surface Plasmons

2023

Nanomaterials

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Plasmon electronic dephasing lifetime is one of the most important characteristics of localized surface plasmons, which is crucial both for understanding the related photophysics and for their applications in photonic and optoelectronic devices. This lifetime is generally shorter than 100 fs and measured using the femtosecond pump–probe technique, which requires femtosecond laser amplifiers delivering pulses with a duration even as short as 10 fs. This implies a large-scale laser system with complicated pulse compression schemes, introducing high-cost and technological challenges. Meanwhile, the strong optical pulse from an amplifier induces more thermal-related effects, disturbing the precise resolution of the pure electronic dephasing lifetime. In this work, we use a simple autocorrelator design and integrate it with the sample of plasmonic nanostructures, where a femtosecond laser oscillator supplies the incident pulses for autocorrelation measurements. Thus, the measured autocorrelation trace carries the optical modulation on the incident pulses. The dephasing lifetime can be thus determined by a comparison between the theoretical fittings to the autocorrelation traces with and without the plasmonic modulation. The measured timescale for the autocorrelation modulation is an indirect determination of the plasmonic dephasing lifetime. This supplies a simple, rapid, and low-cost method for quantitative characterization of the ultrafast optical response of localized surface plasmons.

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Theoretical study of surface plasmonic refractive index sensing based on gold nano-cross array and gold nanofilm

Cited by 22 publications

References 32 publications

Multiple Fano resonances by MIM waveguide coupling whispering gallery mode resonator and application in Refractive index sensing

Multiple Fano resonances by MIM waveguide coupling whispering gallery mode resonator and application in Refractive index sensing

Study the Sensing Properties of Gold, Silver, and Aluminium Coupling Plasmon Nano-Sphere and Homo-Dimers

Femtosecond Autocorrelation of Localized Surface Plasmons

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