Abstract
This study proposes using double-layer wire-grid structures to create narrow-band, perfect plasmonic absorbers, which depend on polarization, for the short-wavelength visible and near-ultraviolet regions of the electromagnetic spectrum. A rigorous coupled-wave analysis reveals that the maximum absorption attained using Ag and Al is ~ 90% at 450 and 375 nm. Experiments using Ag yielded results similar to those predicted by simulations. These results demonstrate that narrow-band perfect plasmonic absorbers, which depend on the polarization, can be realized at 450 and 375 nm using Ag or Al.
Highlights
Optical filters are used over the wide wavelength range extending from the ultraviolet (UV) to infrared region of the spectrum
We have focused on perfect absorbers, which are one kind of wavelength-selection filter
The experimental results (Fig. 6b) have some additional structure, the absorptance was 95.6% at 5.9°, almost matching the simulation results. These results demonstrate that this structure acts as a narrow-band perfect absorber that absorbs Transverse magnetic (TM)-polarized light at the specific wavelengths of 450 and 375 nm and reflects light of other wavelengths in the short-wavelength visible region and near-UV region
Summary
Optical filters are used over the wide wavelength range extending from the ultraviolet (UV) to infrared region of the spectrum. They can be roughly divided by function, such as for improving the brightness and contrast of images, selecting light and color at a specific wavelength by transmission or reflection, or scattering and attenuating light. We focused on an optical filter for narrow-band wavelength selection. Such filters can be divided into three types: filters that transmit light of a specific wavelength, filters that reflect light, and filters that absorb light. UV applications include bandpass filters [27,28,29,30], band-stop filters [31], and broad-band absorbers from
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