Abstract
Chiral metasurfaces have recently undergone a dramatic development, due to their important applications in optics, chemistry and biology. However, the tunability and reconfigurability of the chiral metasurfaces remain challenges. Then, we proposed an S-shaped metamirror consisting of a MIM (Au-LiNbO3−Au) structure with a dual-band chiral absorption in the near-infrared range. The proposed structure has two resonant wavelengths with a giant chiro-optical effect. The giant chiro-optical effect originates from the different plasmonic resonances induced by the incident circularly polarized light (CPL) with opposite spin states. By tuning the voltage and thus tuning the refractive index of the lithium niobate (LiNbO3), chiral resonant wavelengths can be dynamically adjusted in a large range as desired. Furthermore, by tuning the refractive index of LiNbO3, we can move the short-wavelength resonance peak to the position of another long-wavelength resonance peak. Therefore, the chiral metamirror can be dynamically reconfigured at the position of the long-wavelength resonance peak. The work offers a further step in developing tunable and reconfigurable chirality for possible applications including reconfigurable chiral hologram, chiral-selective absorber and other chiral components in near-infrared region.
Highlights
In addition to the amplitude, phase, and wavelength, the polarization state of light plays an important role in the light and matter interactions
By tuning the voltage and tuning the refractive index of the lithium niobate (LiNbO3), chiral resonant wavelengths can be dynamically adjusted in a large range as desired
The chiral metasurface has undergone a dramatic development with enhanced chiro-optical properties, which have been applied in negative refraction [24], [25], biosensor [26], communication [27], [28], etc
Summary
In addition to the amplitude, phase, and wavelength, the polarization state of light plays an important role in the light and matter interactions. Tremendous efforts have been made to design active metasurfaces using optical materials that can be adjusted by electricity, heat and light, such as grapheme [15], [16], VO2 [17], [18], phase change material GST [19], LiNbO3 [20], [21], and liquid crystal [22], [23]. GST [29] has been successfully employed in chiral metasurface, the device cannot achieve continuous tunable chiral absorption This is because GST has only two states. By further tuning the refractive index of LiNbO3, we can move the short-wavelength resonance peak to the position of another long-wavelength resonance peak within certain bandwidth It means that the chiral reconfigurability can be achieved by tuning applied voltage. We introduce a new mechanism to fulfill the chiral adjustability and reconfigurability of the metamirror
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