Ceramics International, Год журнала: 2025, Номер unknown
Опубликована: Май 1, 2025
Язык: Английский
Physics Letters A, Год журнала: 2025, Номер unknown, С. 130262 - 130262
Опубликована: Янв. 1, 2025
Язык: Английский
Процитировано
51
Nano Letters, Год журнала: 2024, Номер 24(45), С. 14466 - 14474
Опубликована: Окт. 30, 2024
Optical metasurfaces have revolutionized analog computing and image processing at subwavelength scales with faster speed lower power consumption. They typically involve spatial differentiation an engineered angular dispersion. Quasi-bound states in the continuum (quasi-BICs) emerged as powerful tools for customizing optical resonances. While quasi-BICs been widely used high
Язык: Английский
Процитировано
27
Materials Today Electronics, Год журнала: 2025, Номер unknown, С. 100142 - 100142
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
1
Optics Express, Год журнала: 2025, Номер 33(2), С. 2338 - 2338
Опубликована: Янв. 2, 2025
Terahertz modulation technology based on programmable metasurfaces can respond in real time to external signals or environmental changes, enabling flexible and adaptive control of terahertz waves. This demonstrates significant potential importance across various fields, including communication, imaging, scientific research, security monitoring, industrial applications. paper proposes a metasurface solid-state plasma, utilizing plasma devices achieve dynamic properties such as the amplitude phase Compared traditional silicon-based devices, GaAs/AlGaAs heterostructures enhance both forward current concentration by two orders magnitude, with carrier concentrations exceeding 10 19 cm −3 . Additionally, we designed containing 12×12 supercells, achieving waves elevation direction through different coding schemes. Furthermore, this explores stealth mechanism metasurfaces, effective cloaking detection targets specific compensation.
Язык: Английский
Процитировано
0
Journal of Optics, Год журнала: 2025, Номер 27(2), С. 025104 - 025104
Опубликована: Янв. 28, 2025
Abstract Metasurfaces have provided new opportunities for the realization of flat lenses, among which tunable metalenses garnered considerable attention due to their flexible functionalities. In this paper, we present a continuously metalens based on phase-change material Sb 2 S 3 , enables precise and continuous focal length control through transition states. Under excitation linearly polarized light at 1550 nm, phase compensation is by changing crystallization state nanopillars, allowing shift between 36 µ m 48 m. At same time, maintains high focusing efficiency over 75%. This approach provides greater design flexibility broader applicability across diverse applications. By reducing reliance sources, it enhances device integration tunability, paving way in practical implementation advanced optical imaging nanophotonics.
Язык: Английский
Процитировано
0
Opto-Electronic Science, Год журнала: 2025, Номер 0(0), С. 240025 - 240025
Опубликована: Янв. 1, 2025
Язык: Английский
Процитировано
0
Molecules, Год журнала: 2025, Номер 30(5), С. 999 - 999
Опубликована: Фев. 21, 2025
We employed the CST Microwave Studio software 2020 and FDID algorithm for simulation. have designed a terahertz broadband absorber based on Dirac semimetals graphene, achieving continuous absorption with rate exceeding 80% over range from 7.6776 to 9.172 THz. This features two independent tuning modes, utilizing graphene semimetals, exhibits strong electromagnetic adaptability. Furthermore, we conducted an in-depth analysis of physical mechanisms underlying high in these absorbers using impedance matching theory localized surface plasmon resonance (LSPR) theory. Variations dielectric constants different layers relaxation time can also modulate rate. In summary, our proposed absorber, employing distinct tunable materials, enhances device’s flexibility environmental adaptability, offering promising prospects wideband applications.
Язык: Английский
Процитировано
0
Applied Physics Letters, Год журнала: 2025, Номер 126(8)
Опубликована: Фев. 24, 2025
Optical metasurfaces have enabled high-speed, low-power image processing within a compact footprint. However, reconfigurable imaging in such flat devices remains critical challenge for fully harnessing their potential practical applications. Here, we propose and demonstrate phase-change capable of dynamically switching between edge-detection bright-field the visible spectrum. This reconfigurability is achieved through engineering angular dispersion at electric magnetic Mie-type resonances. The customized metasurface exhibits an angle-dependent transmittance profile amorphous state Sb2S3 meta-atoms efficient isotropic edge detection, angle-independent crystalline uniform imaging. nanostructured Sb2S3-based hold significant applications computer vision autonomous driving systems.
Язык: Английский
Процитировано
0
Laser & Photonics Review, Год журнала: 2025, Номер unknown
Опубликована: Март 22, 2025
Abstract Chiral metamaterials based on mirror‐symmetry broken resonators are engineered to achieve a strong interaction with circularly polarized (CP) waves. However, in contrast the widely‐observed enhanced circular dichroism (CD), moderate/narrow‐band optical activity (OA) responses usually seen chiral metadevices. Here, by engineering chirality parameter that determines effective refractive indices associated two CP eigenstates, three‐dimensional (3D) metamaterial consisting of 3D‐printed ceramic meta‐atoms exhibiting broadband OA nondispersive near‐zero ellipticity millimeter‐wave regime is demonstrated. With four‐fold rotational symmetry ( C 4 ), 3D dielectric shows near‐identical co‐polarized transmission magnitude but distinct phase retardations under left‐handed (LCP) and right‐handed (RCP) illumination over broad frequency range. Field analysis indicates observed behavior originates from handedness‐dependent light‐matter between Furthermore, large CD polarization conversion 2 ‐symmetry, demonstrating proposed systems’ versatility wave control. As revealed present study, coherently exploring complex parametric space offered state‐of‐the‐art fabrication techniques can become promising paradigm for sophisticated functionalities.
Язык: Английский
Процитировано
0
Nanophotonics, Год журнала: 2025, Номер unknown
Опубликована: Март 25, 2025
Abstract Artificial intelligence algorithms based on deep neural network (DNN) have become an effective tool for conceiving metasurfaces recently. However, the complex and sharp resonances of will tremendously increase training difficulty DNNs with non-negligible prediction errors, which hinders their development in designing multifunctional metasurfaces. To overcome obstacles, interaction mechanisms between meta-atoms terahertz (THz) waves via multipole decomposition are investigated to establish a high-quality dataset, can decrease complexity DNN improve accuracy. Meanwhile, transfer learning is also employed reduce large quantity data required by DNN. Accordingly, two broadband transmission-reflection-integrated reconfigurable focused vortex beam generation inversely designed counter propagating fraction error less than 10 −4 . The results indicate that achromatic performances well achieved frequency range 0.7–1.3 THz, average focusing efficiency mode purity higher 48 % 92 %, respectively. Moreover, THz imaging edge detection be realized This work provides high accuracy inverse design method meta-devices, may promise further progress on-chip systems.
Язык: Английский
Процитировано
0