Helicity multiplexed broadband meta-holography for ultraviolet regime

Abstract

Here in this paper, we proposed a metasurface, which consists of silicon nitride as dielectric material possessing a high transparent window in the ultraviolet regime. We designed a single-layer dual-band metasurface instead of stacking and interleaved technique to overcome noise and low resolution, which gives broadband response for UV wavelengths. The proposed spin multiplexed metasurface is capable of generating two independent holographic images for right circularly polarized (RCP) and left circularly polarized (LCP) light. We achieved maximum cross-polarization efficiency on the designed wavelength i.e. 350nm and negligible zero-order efficiency. The unit cell and the proposed metasurface are simulated using Finite Difference Time Domain-based FDTD Solution from Lumerical Inc. for the specific wavelength while it gives broadband response for the wavelength band almost covering 290nm to 390nm.

Recent Progress on Plasmonic and Dielectric Chiral Metasurfaces: Fundamentals, Design Strategies, and Implementation

“…Chiral metasurfaces are categorized into plasmonic or dielectric chiral metasurfaces. [ 25–45 ] Plasmonic chiral metasurfaces are designed by metals to exhibit strong light–matter interaction due to surface plasmon resonances. [ 46–49 ] This strong interaction increases the efficiency of sensing and optical frequency conversion applications.…”

Dielectric chiral metasurfaces for enhanced circular dichroism spectroscopy at near infrared regime

“…Over the last two decades, articially designed materials, metamaterials, and metasurfaces have gained considerable interest due to their extraordinary properties to manipulate electromagnetic (EM) waves for various applications. [1][2][3][4][5][6][7][8] Meanwhile, chiral metamaterials have been investigated for several potential applications in our daily life, such as sensing, imaging, ultrathin polarizers, etc. 6,7,[9][10][11][12] However, fabrication ease and extra freedom in chiral metasurfaces (the planar version of chiral metamaterials) made them the more convenient solution for application in chiral optics.…”

Multifunctional all-dielectric nanosurfaces for generation and detection of focused optical vortices

“…A metasurface consists of a 2D array of precisely optimized building blocks that reveal unprecedented capability to manipulate the polarization, amplitude, and phase of the input wave [8]- [12]. Recently, metasurfaces have been of significant interest as a promising candidate for numerous exotic applications and devices like flat lenses [13]- [15], structured light generators [16]- [21], meta-holography [22]- [29], metaabsorbers [30]- [34], structural color [35]- [37], multifunctional devices [38]- [40], and reconfigurable intelligent structures [41]- [43]. In the last few years, deep learning and machine learning have played a vital role in designing and developing these artificially engineered structures by reducing numerical computations and time [44]- [47].…”