Decay rates modification through coupling of degenerate surface plasmon modes

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

doi:10.1364/ol.37.002736

Opt. Lett.

2012

DOI: 10.1364/ol.37.002736

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Decay rates modification through coupling of degenerate surface plasmon modes

Jack Hau Yung Lo

H. C. Ong

Abstract: We measured the decay rates of two degenerate surface plasmon modes in Au nanohole arrays with different hole sizes by angle-resolved reflectivity spectroscopy. For each hole size, at the spectral region where resonant coupling occurs, we observed a large modification in decay rates, leading to the formation of dark and bright modes. The change in decay rates is well explained by temporal coupled mode theory. The deduced coupling constant is found to increase with increasing hole diameter. This study provides … Show more

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Cited by 3 publications

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Selective Light Absorption and Spectral Manipulation via an Electro-Optical Nano-Cavity

Yang

et al. 2022

IEEE Photonics J.

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A frequency-region selective light absorber is theoretically investigated by an electro-optical waveguide cavity coupled plasmonic micro-structure. A spectrally separated broadband near-unity absorption in the visible and the narrow band absorption peak in the near-infrared regime are simultaneously achieved due to the different resonant behaviors located in the different positions of the stereostructure. This spatial and frequency selective light absorption shows impressive distinct behaviors during the electro-optical (EO) operation. The absorption band in the visible maintains well while the absorption peak in the longer wavelength range presents a sensitive response to the external voltage. Based on the numerical simulation, a spectral shift related sensitivity reaches 7.1 nm/V for the infrared absorption peak when the applied voltage is launched. Meanwhile, the absorption efficiency is still keeping in the high level with the intensity exceeding 97.5%. These findings open a facile way for differential light absorption and spectral manipulation via the well-design of spatial geometry-related resonant metamaterial.

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Selective Light Absorption and Spectral Manipulation via an Electro-Optical Nano-Cavity

Yang

et al. 2022

IEEE Photonics J.

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Determination of the absorption and radiative decay rates of dark and bright plasmonic modes

Cao¹,

Ong²

2014

Opt. Express

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When two degenerate surface plasmon polariton (SPP) modes couple, in addition to the creation of plasmonic band gap, their respective decay rates are modified as well, resulting in the formation of a pair of dark and bright modes. We combine temporal coupled mode theory, finite-difference time-domain simulation, and angle- and polarization-resolved reflectivity spectroscopy to study the absorption and radiative decay rates of this pair in periodic system. One-dimensional metallic groove arrays are served as an example here. We find for arrays with small groove width, when approaching to the coupling of -1 and + 1 SPP modes, while the radiative decay rate of the high energy mode tends to become zero, the absorption rate decreases as well, forming a "cold" dark mode. At the same time, both the absorption and radiative decay rates of the low energy mode increase, yielding a "hot" bright mode. The situation is completely reversed when groove width increases, turning the high energy mode into a "cold" bright mode and vice versa for the low energy mode. We attribute such modifications to the interplay between the real and imaginary parts of the complex coupling constant, which are found to be highly geometry dependent. Further numerical simulations show the hybridized modes exhibits distinctive electric and magnetic field symmetries, giving rise to different surface charge distributions and Poynting vector profiles, which significantly affect the resulting absorption and radiation losses. Finally, we have measured the decay rates and the complex coupling constant of the hybridized modes and the experimental results are consistent with the analytic and numerical results.

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Momentum-dependent group velocity of surface plasmon polaritons in two-dimensional metallic nanohole array

Cao¹,

Ong²

2016

Opt. Express

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We determine the momentum-dependent group velocities of ( ± 1,0) and (0, ± 1) Bloch-like surface plasmon polaritons (SPPs) in two-dimensional Au nanohole array by measuring their propagation lengths and decay lifetimes at different SPP propagation length via angle- and polarization-resolved reflectivity spectroscopy and real- and Fourier-space microscopy. We find the decay length and lifetime, as well as group velocity, are highly dependent on the propagation direction. In particular, close to the Γ-M direction where two SPPs begin to interfere, the group velocity decreases due to the increase of the standing wave character. More importantly, the two SPPs are strongly interacted with each other at the Γ-M direction, resulting in forming the dark and bright modes. We find the group velocity of the dark mode is higher that of the bright mode despite its higher quality factor, or longer decay lifetime. We attribute such difference to the distinct field symmetries of dark and bright modes, yielding different effective indices. While bright mode has fields mostly concentrated at the flat metal region to produce higher effective index and therefore lower velocity, the fields of the dark mode are located near the air hole, resulting in higher velocity.

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Decay rates modification through coupling of degenerate surface plasmon modes

Cited by 3 publications

References 15 publications

Selective Light Absorption and Spectral Manipulation via an Electro-Optical Nano-Cavity

Selective Light Absorption and Spectral Manipulation via an Electro-Optical Nano-Cavity

Determination of the absorption and radiative decay rates of dark and bright plasmonic modes

Momentum-dependent group velocity of surface plasmon polaritons in two-dimensional metallic nanohole array

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