Holographic three-dimensional display is an important display technique because it can provide all depth information of a real or virtual scene without any special eyewear. In recent years, with the development of computer and optoelectronic technology, computer-generated holograms have attracted extensive attention and developed as the most promising method to realize holographic display. However, some bottlenecks still restrict the development of computer-generated holograms, such as heavy computation burden, low image quality, and the complicated system of color holographic display. To overcome these problems, numerous algorithms have been investigated with the aim of color dynamic holographic three-dimensional display. In this review, we will explain the essence of various computer-generated hologram algorithms and provide some insights for future research.
Chirality reversal between enantiomers is of great importance in both fundamental science and practical applications in chiroptics, biomedicine, and analytical chemistry. Here, we demonstrate an abrupt sign reversal of circular dichroism (CD) between artificial plasmonic diastereoisomers, which are a kind of stereo twisted metamolecules with different strength of deformations. The sign of the CD response is reversed in the same wavelength region by simply engineering the deformation height of nanostructures. Electromagnetic multipolar analysis shows that the sign of CD is determined by the phase-controlled handedness-dependent excitations of electric quadrupole modes. The numerical simulations are further verified by experiments using a nano-kirigami fabrication method. This work reveals that under certain circumstances, the CD response of the plasmonic diastereoisomers can be very close to that of enantiomers, which is useful for the exploration of profound chiroptics, as well as for the applications in chirality switching, chiral biosensing, and chiral separation.
Search of new novel materials for bringing advancement in the field of energy storage and optical materials is tremendously growing in order to meet future challenges. Gallium nitride (GaN) shows exceptional optoelectronic behavior which is highly needed for production of optoelectronic devices. Therefore, in this research study, we investigate the structural, electronic, magnetic, and optical properties of zirconium doped GaN (Zr@GaN) and Ti-Zr co-doped GaN using the Wien2k code. Proactive role of dopants Ti and Zr d-states is observed which appreciably tune electronic properties. GaN remains non-magnetic after zirconium substitution with Ga atom however, Ti-Zr co-doping produce magnetism into GaN with total magnetic moment of 1.503 . Absorption spectrum of Zr@GaN shows blueshift while for Ti-Zr@GaN material exhibit redshift. However, absorption spectra of both proposed materials significantly enhanced in the UV region which propose their potential uses in the high power UV optoelectronics, spintronics, photonics, and photovoltaic devices.
Considering that the driver and passengers need different display content in the vehicle display, we propose a dual-view and multi-content head-up display (HUD). Based on the angle selectivity of volume holographic grating (VHG), the multiplexed VHGs diffract light beams at different angles to achieve dual-view display. Based on the wavelength selectivity of VHG, the multiplexed VHGs diffract light beams of different wavelengths that carry different information to realize multi-content display. The HUD prototype is composed of a miniature laser projector, a diffuser, and a holographic combiner. The holographic combiner with a size of 20cm×15cm includes a red-green multiplexed VHG1, a red-blue multiplexed VHG2 and a glass substrate. The field of views (FOVs) and eye-boxs (EBs) of the two viewing zones are 10°×5°and 8°×4°, 147mm×81mm and 105mm×87mm, respectively. In addition, compared with the traditional dual-view HUD, the proposed HUD only requires one picture generation unit (PGU), which is beneficial for its application to compact vehicle or aviation displays. Moreover, the driver and passengers can see the red warning information displayed by the system at the same time, which can significantly improve driving safety.
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