Determination of absorption and radiative decay rates of surface plasmon polaritons from nanohole array

Abstract

We have devised a simple method to determine the absorption and radiative decay rates of surface plasmon polaritons in an Au nanohole array by combining polarization-resolved reflectivity spectroscopy and temporal coupled-mode theory. The dependence of two rates on wavelength has been measured and they are found to agree with finite-difference time-domain simulations. As both absorption and radiative decay rates play a key role in several plasmonic applications, our approach offers a simple and effective means in determining them.

Investigating the Optical Transmission Spectra of Plasmonic Spherical Nano-Hole Arrays

“…One of the most interesting plasmonic structures is metallic films perforated with periodic nano-hole arrays [7][8][9] that may lead to extraordinary transmission [10][11][12]. The extraordinary behaviors of the perforated metallic film are largely due to the presence of surface plasmons (SPs), which can be excited by illuminating the film using a Gaussian beam.…”

“…The extraordinary behaviors of the perforated metallic film are largely due to the presence of surface plasmons (SPs), which can be excited by illuminating the film using a Gaussian beam. It was found in the literature that the coupling/ decoupling phenomenon between the SPs of the patterned metallic film and the incident light results in appearance of multiple resonance peaks in the transmission spectrum [7][8][9][10].…”

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

“…(1) [19,26], where r s is the s-reflection coefficient. If one places a detection analyzer orthogonally to the incident polarizer, the Jones operation thus is 1∕2 1…”

“…The reflectivity spectrum exhibits a Lorentzian line shape [19,26]. At resonance and Γ abs Γ rad , the peak height of R orth is equal to 0.25, which thereby serves as a signature to identify the crossing of two rates.…”

“…We set the wavelength of the pulsed excitation source centered either at 800 or 900 nm with bandwidth ∼100 nm to ensure that only one SPP mode is excited. For each array, we simulated the orthogonal reflectivity spectra at different incident angles for identifying the suitable angle for exciting the SPPs at λ SPP [26].…”