Liquid Crystals Reviews, Год журнала: 2024, Номер 12(2), С. 128 - 148
Опубликована: Июль 2, 2024
Язык: Английский
Optics and Lasers in Engineering, Год журнала: 2025, Номер 186, С. 108795 - 108795
Опубликована: Янв. 5, 2025
Язык: Английский
Процитировано
0
Laser & Photonics Review, Год журнала: 2025, Номер unknown
Опубликована: Янв. 24, 2025
Abstract The Moiré metalens (MML) offers a wide zoom range and easy adjustability, making it an excellent candidate for integrated optical systems. However, the focusing performance of traditional MML rapidly deteriorates under slight perturbations or imprecise settings, their intrinsic low efficiency further limits practical applications. To address these challenges, modified is developed with novel phase distribution. This exhibits significantly enhanced performances, achieving over 40% across ≈17× range, axial displacement tolerance 40λ, lateral misalignment 10 units (meta‐element size), ultra‐wide operating bandwidth covering ≈40% central frequency. In proof‐of‐concept experiment using frequency‐tunable terahertz (THz) free‐electron laser, experimental results aligned well numerical simulations, demonstrating exceptional performances in THz band. Furthermore, its design can extend beyond offering promising approach varifocal lens entire electromagnetic spectrum.
Язык: Английский
Процитировано
0
Optics & Laser Technology, Год журнала: 2025, Номер 184, С. 112550 - 112550
Опубликована: Янв. 30, 2025
Язык: Английский
Процитировано
0
Laser & Photonics Review, Год журнала: 2025, Номер unknown
Опубликована: Март 8, 2025
Abstract Vortex beams with orbital angular momentum (OAM) exhibit immense potential in various fields such as communications, information processing, and optical tweezers. Nevertheless, current terahertz vortex beam generators still face challenges including narrow frequency bands, low efficiency, limited multiplexing capabilities, difficulties dynamic tuning. Here, the study introduces a new electrically controlled multi‐channel strategy that harnesses cascaded helical geometric metasurface, liquid crystal (LC) layer, OAM‐based metalens to achieve comprehensive independent phase manipulation across all four spin channels. Moreover, by employing spin, spatial, OAM multiplexing, LC active control technology, eight distinguishable (SAM)‐OAM coupling states are decoded, enabling of 6 different topological charges. Experimental validation reveals remarkable performance: within broadband range 0.4–0.6 THz, peak excitation efficiency up 94%, each mode purity reaching its highest level >80%, minimum value inter‐mode crosstalk is <–11 dB. This generation conversion mechanism enhances operational flexibility light field manipulation, breaking through limitations channel band, pioneering novel avenue for bolstering parallel mitigating inter‐channel crosstalk.
Язык: Английский
Процитировано
0
Advanced Functional Materials, Год журнала: 2025, Номер unknown
Опубликована: Апрель 7, 2025
Abstract Nonreciprocal devices, enabling asymmetric light transmission, are essential for many photonic applications. However, nonreciprocal devices driven by circularly polarized incident light, without relying on optical nonlinearity or magnetic fields, have been rarely reported. This study introduces a novel device based photothermally cholesteric‐to‐isotropic phase transition (CIT) in cholesteric liquid crystals (CLCs). The enables transmission of (CPL) requiring external bias, nonlinearity. By incorporating polydopamine (PDA)‐doped polyvinyl acetate (PVA) layer photothermal conversion, the achieves self‐biasing through heat generated signal light. performance is tunable, with contrast and insertion loss adjustable via PDA concentration. At 808 nm CPL, an isolation ratio 7.7 dB 1.1 dB. Additionally, extending bandgap CLCs allows at 405 high 16.5 also functions as switch, low‐power pump assistance, shows promise applications digital holography. These capabilities highlight device's potential use all‐optical communication networks chirality‐based systems.
Язык: Английский
Процитировано
0
Advanced Optical Materials, Год журнала: 2024, Номер unknown
Опубликована: Дек. 30, 2024
Abstract Owing to their intrinsic multiple physical dimensions and high parallelism, photons are superior electrons when they act as information carriers. The independent dynamic spatial modulations of optical parameters light highly pursued in vital fields such supercomputing, constellation satellite communications, virtual/augmented reality, holographic displays. To date, it is still challenging accomplish this urgent task with a single element. Here, parameter carried out via manipulation the separate levels hierarchical structure. Photopatterning, irradiation, an electric field adopted regulate patterned crystallizations, lattice constants, tilt angles blue‐phase liquid crystals (BPLCs). As associated individual structural features, enables binary reflectance geometric phase modulations, reversable wavelength shifting, continuous variations excellent independency. This work unlocks multi‐degree modulation addresses miniaturization, integration, multifunctional tendencies rapidly growing informatics. its merits omnidirectional, control, response, may dramatically upgrade performance existing optics.
Язык: Английский
Процитировано
1
Liquid Crystals Reviews, Год журнала: 2024, Номер 12(2), С. 128 - 148
Опубликована: Июль 2, 2024
Язык: Английский
Процитировано
0