Direct measurement of radiative scattering of surface plasmon polariton resonance from metallic arrays by polarization-resolved reflectivity spectroscopy

Lo, Jack Hau Yung; Chan, Collin; Ong, H. C.

doi:10.1063/1.4764543

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…Even though Equation (2) provides a convenient analytical method to determine the excitation condition for SPPs in a plasmonic structure, it is not adequate to determine the magnitude of plasmonic enhancement in the structure. Field enhancement in plasmonic structures has been modelled and studied using coupled mode theory (CMT) [17,18]. Using CMT, the following relation connecting the field enhancement in plasmonic structures and the quality factor of the resonant optical modes can be derived as [19,20] |E…”

Section: Theorymentioning

confidence: 99%

Hot Electron Plasmon-Resonant Grating Structures for Enhanced Photochemistry: A Theoretical Study

et al. 2021

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Metallic grating structures have been shown to provide an effective platform for generating hot electrons and driving electrochemical reactions. Here, we present a systematic theoretical study of the surface plasmon resonance in different corrugated metallic grating structures using computational electromagnetic tools (i.e., the finite difference time domain (FDTD) method). We identify the corrugation parameters that produce maximum resonant field enhancement at commonly used wavelengths for photocatalytic applications (633 nm and 785 nm) in different material systems, including Ag, Au, Cu, Al, and Pt. The absorption spectra of each grating structure have been fitted with the analytical equation obtained from Coupled Mode Theory. We then extracted the absorptive and radiative loss rates. The field enhancement can be maximized by matching the absorption and radiation losses via tuning the geometric parameters. We could improve the average field enhancement of 633 nm and 785 nm modes by a factor of 1.8× and 3.8× for Ag, 1.4× and 3.6× for Au, and 1.2× and 2.6× for Cu. The optimum structures are found to be shallower for Ag, Au, and Cu; deeper for Pt; and to almost remain the same for Al. The gratings become flat for all the metals for increasing the average field enhancement. Overall, Ag and Au were found to be the best in terms of overall field enhancement while Pt had the worst performance.

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Section: Theorymentioning

confidence: 99%

Hot Electron Plasmon-Resonant Grating Structures for Enhanced Photochemistry: A Theoretical Study

et al. 2021

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“…We began with the CMT formulation [18][19][20]. CMT for field enhancement has been used in nanoantennas [21] and nanoparticles [22] and is extended here for periodic arrays.…”

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confidence: 99%

Interplay between absorption and radiative decay rates of surface plasmon polaritons for field enhancement in periodic arrays

et al. 2014

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We studied the effects of absorption and radiative decay rates of surface plasmon polaritons on the field enhancement in periodic metallic arrays by temporal coupled mode theory and finite-difference time-domain simulation. When two rates are equal, the field enhancement is the strongest and the peak height of the orthogonal reflectivity reaches 0.25. To demonstrate this fact, we fabricated two series of two-dimensional Au and Ag nanohole arrays with different geometries and measured their corresponding reflectivity and decay rates. The experimental results agree well with the analytical and numerical results.

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Direct imaging of radiative decay of surface plasmon polaritons in nanohole arrays by cross-polarization microscopy

Cao¹,

Ong²

2013

Applied Physics Letters

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We employ angle- and polarization-resolved optical microscope to image the radiative decay patterns of surface plasmon polaritons (SPPs) in Au nanohole array. By controlling the incident angle, we excite desired SPP mode and image its radiative decay under cross-polarization configuration. The experimental results are supported by temporal coupled mode theory and confirmed by finite-difference time-domain simulations and analytical calculations. Our approach is effective in studying the decay process of any particular SPP mode in periodic structures and thus is useful in understanding SPP mediated Raman scattering and fluorescence.

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Direct measurement of radiative scattering of surface plasmon polariton resonance from metallic arrays by polarization-resolved reflectivity spectroscopy

Cited by 7 publications

References 10 publications

Hot Electron Plasmon-Resonant Grating Structures for Enhanced Photochemistry: A Theoretical Study

Hot Electron Plasmon-Resonant Grating Structures for Enhanced Photochemistry: A Theoretical Study

Interplay between absorption and radiative decay rates of surface plasmon polaritons for field enhancement in periodic arrays

Direct imaging of radiative decay of surface plasmon polaritons in nanohole arrays by cross-polarization microscopy

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