Numerical Study of an Au-ZnO-Al Perfect Absorber for a Color Filter with a High Quality Factor

Vivid Coloration and Broadband Perfect Absorption Based on Asymmetric Fabry–Pérot Nanocavities Incorporating Platinum

“…To date, F–P nanocavity-based color filters have been primarily implemented by utilizing noble metals, such as Ag and Au, owing to their high reflectivity in the visible regime. − Meanwhile, asymmetric F–P nanocavities, made of lossy metals including Ni, were recently reported to produce highly reflective colors. − We performed a comparative analysis of the characteristics of the proposed Pt-based F–P filters. The refractive indices of the noble metals are plotted in Figure a through c.…”

“…This nanocavity can enable spectral filtering with a perfect absorption at the resonance wavelength. , A suppressed band in the reflection mode, which is relevant to such a strong absorption through light–matter interaction, is essential for achieving bright coloration with high purity. , Perfect absorbers have a wide range of applications spanning photovoltaics, − photodetectors, , and thermal imaging . Spectral filters have been mostly realized using noble metals such as silver (Ag) ,,− and gold (Au). − These noble metals feature high reflection and low extinction throughout the visible band, and a near-perfect absorption initiated by the F–P resonant cavity may produce a narrowband spectral response, thus facilitating the realization of color filters or narrowband perfect absorbers. An MDM absorber comprising lossy metals, including chromium (Cr), titanium (Ti), nickel (Ni), tungsten (W), and manganese (Mn), has shown some potential for broadband absorption. − ,− Otherwise, such a broadband perfect absorption was mainly demonstrated through alternately stacked layers of metals and dielectrics. ,− Various types of plasmonic nanostructured metamaterials for achieving broadband perfect absorption in the visible to near-infrared region have also been extensively researched.…”

Ta/NiO subwavelength bilayer for wide gamut, strong interference structural color

“…The proposed device structure is based on the low reflectivity metal Ta semi-infinite layer covered with a lossless dielectric nanometer-thick subwavelength NiO layer. NiO was chosen because among all the optical AR coatings involving different materials, NiO is rather overlooked [15,17,[26][27][28][29][30][31] and little explored [32] despite the fact that NiO thin films have drawn much attention because their promising potential applications in solar or optoelectronic devices [33][34][35][36][37][38][39][40][41]. Moreover, because NiO may be considered as a lossless dielectric in the visible range, Ta was chosen because it is a metal with low reflectivity which is mandatory to induce a strong light absorption [16,32].…”

Fabrication of perfect plasmonic absorbers for blue and near-ultraviolet lights using double-layer wire-grid structures

“…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. Examples include filters used for biosensing [1], infrared spectroscopy [2], solar cells [3][4][5], cooling by heat release [6][7][8], image sensors [9], color filters [10][11][12][13][14][15][16][17][18], detectors [19][20][21], and fluorescence observations [22].…”

“…In this study, we have focused on perfect absorbers, which are one kind of wavelength-selection filter. Perfect absorbers have been studied for visible, infrared, and THz-light applications [2,3,17,[23][24][25][26]. On the contrary, UV applications include bandpass filters [27][28][29][30], band-stop filters [31], and broad-band absorbers from the UV to near infrared [32].…”