Enhanced transmission of periodic, quasiperiodic, and random nanoaperture arrays
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(Color online) Transmission spectra of a quasiperiodically arranged sequence of nanoslits for various supercell sizes (a) and a random arrangement of nanoslits (b) where the sequence consists of the same number of elements. The sketches above the spectra show the arrangement of the apertures for . Two resonances [labeled with (1) and (2)] likewise appear for both the QPP and the random pattern. For these resonances, the modulus of the magnetic field normalized to the incident wave is shown in (c) and (d) for , respectively.
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(Color online) Scanning electron microscope images of a periodic (a), a fivefold QPP (b), and a random pattern of annular nanoapertures with a minimal enforced distance among neighboring nanoapertures of (c). Connecting lines in (a) and (b) are drawn as a guide to the eye. The fivefold QPP consists of two diamond shaped unit cells with the same side length but different opening angles. The measured (red line) and simulated (dashed, blue line) transmission spectra through a periodic pattern are shown in (d). The measured spectra through a fivefold and a sevenfold QPP are shown in (e) and through the random pattern of annular nanoapertures in (f). In (f), the minimal enforced center-to-center distance of the nanoapertures was varied.
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