Monochromatic filter with multiple manipulation approaches by the layered all-dielectric patch array

Abstract

Monochromatic filtering with ultra-narrowband and high spectral contrast is desirable for wide applications in display, image, and other optoelectronics. However, owing to the inherent omhic losses in the metallic materials, a broadband spectrum with a low Q-factor down to 10 inevitably limits the device performance. Herein, we for the first time theoretically propose and demonstrate an ultra-narrowband color-filtering platform based on the layered all-dielectric meta-material (LADM), which consists of a triple-layer high/low/high-index dielectrics cavity structure. Owing to the lossless dielectric materials used, sharp resonances with the bandwidth down to sub-10 nm are observed in the sub-wavelength LADM-based filters. A spectral Q-factor of 361.6 is achieved, which is orders of magnitude larger than that of the plasmonic resonators. Moreover, for the other significant factor for evaluation of filtering performance, the spectral contrast reaches 94.5%. These optical properties are the main results of the excitation of the resonant modes in the LADMs. Furthermore, polarization-manipulated light filtering is realized in this LADM. The classical Malus law is also confirmed in the reflective spectrum by tuning the polarization state. More interestingly and importantly, the filtering phenomenon shows novel features of the wavelength-independent and tunable resonant intensity for the reflective spectrum when the LADM-based filter is illuminated under an oblique state. High scalability of the sharp reflective spectrum is obtained by tuning the structural parameters. A single-wavelength reflective filtering window is also achieved in the visible frequencies. These features hold promise for the LADM-based filter with wide applications in color engineering, displaying, imaging, etc.

Multipole Resonance in Arrays of Diamond Dielectric: A Metamaterial Perfect Absorber in the Visible Regime

“…The xoy and xoz planes are plotted. In Figure 3a, the electric field is mainly distributed between two adjacent resonators, while the strong magnetic field is distributed in the resonator and has a peak intensity point in the resonator, which proves that there is both electric and magnetic dipole resonance at this wavelength [37,38]. To further understand the contribution of electromagnetism, multipole decomposition of a single resonator is performed in free space, as shown in Figure 3b.…”

Colored dual-functional photovoltaic cells

“…To further enhance the efficiency of the PV devices, the simple way is to combine with broadband AR coatings and novel light trapping structures at the nanoscale, such as metallic nanostructures and randomly textured surfaces, which can induce the light scattering and effectively increase the optical path length [55][56][57][58][59]. Other possible way to further improve the power conversion efficiency of the colored PV cells is to exploit the broadband light absorbing approaches at visible frequencies and the perfect light absorptions in the infrared (IR) region, the latter of which can potentially be applicable to the thermo-PV technologies [13][14][15][16][17][18][19][20][21][22].…”

“…As an alternative approach to enhance both optical and electrical performances of the colored and semitransparent PV cells, the conventional Fabry-Pérot (F-P) cavity was incorporated with the cathode of various PV devices, including organic and perovskite semiconductors [10][11][12]. We note that other perfect light absorption schemes, which include the plasmonic resonances, plasmonic near-field coupling effects in the metallic nanoparticles, coupled metal film systems and multicavity resonances, can also be incorporated with any PV material system to create the colored PV cells and further improve the performance characteristics [13][14][15][16][17][18][19][20][21][22].…”

Semiconductor meta-surface based perfect light absorber

“…Recently, dielectric resonators have been demonstrated to provide strong electric and magnetic resonances owing to the Mie resonances [24]. Dielectric metamaterials composed of spheres [25] and cubes [26,27] have been utilized to achieve exotic electromagnetic properties [28][29][30][31][32]. For instance, Yao has demonstrated a new approach to light management by forming whispering-gallery resonant modes inside a spherical nanoshell structure using nanocrystalline silicon as a model system [28].…”

“…In this work, in contrast to the all-metal [4,35,36] or alldielectric metamaterials [26,31,37], we numerically proposed and demonstrated a dielectric meta-surface PLA. Semiconductor materials such as silicon is chosen as the dielectric to support electromagnetic resonances and simultaneously to hold potential applications in the light harvesting [38] and optoelectronics [10,22,23,39].…”