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期刊信息更多+
  • 主办单位：
    中国光学工程学会清华大学上海理工大学
  • 名誉主编： 庄松林 院士
  • 国际主编： 顾敏 院士
  • 主       编：
    孙洪波 教授仇旻 教授
  • 创       刊：2020年3月
  • ISSN：2662-1991
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Interleaved frequency comb by chip-scale acousto-optic phase modulation at polydimethylsiloxane for higher-resolution direct plasmonic comb spectroscopy
San Kim, Tae-In Jeong, Robert A. Taylor, Kwangseuk Kyhm, Young-Jin Kim, Seungchul Kim
 doi: 10.1186/s43074-025-00170-x
Abstract(0) PDF(0)
Abstract:
High-resolution spectroscopy unveils the fundamental physics of quantum states, molecular dynamics, and energy transfers. Ideally, a higher spectral resolution over a broader bandwidth is the prerequisite, but traditional spectroscopic techniques can only partially fulfill this requirement even with a bulky system. Here we report that a multi-frequency acousto-optic phase modulation at a chip-scale of soft polydimethylsiloxane can readily support a 200-times higher 0.5-MHz spectral resolution for the frequency-comb-based spectroscopy, while co-located plasmonic nanostructures mediate the strong light-matter interaction. These results suggest the potential of polydimethylsiloxane acousto-optic phase modulation for cost-effective, compact, multifunctional chip-scale tools in diverse applications such as quantum spectroscopy, high-finesse cavity analysis, and surface plasmonic spectroscopy.
Light-propelled photocatalytic evaporator for robotic solar-driven water purification
Dong-Dong Han, Qiang Wang, Zhao-Di Chen, Lei Wang, Zhiyong Chang, Sheng-Yi Xie, Xian-Bin Li, Wei Zhang, Yong-Lai Zhang
 doi: 10.1186/s43074-025-00169-4
Abstract(12) PDF(0)
Abstract:
Solar-driven interfacial water purification (SDIWP) has emerged as a green, cost-effective, and sustainable technology for waste/sea water treatment. However, at present, innovative smart water treatment systems that enable high-efficiency water purification through multiform solar schemes are rare. Herein, we report a light-propelled photocatalytic evaporator based on semi-metallic reduced graphene oxide (RGO)/ titanium carbide MXene-titanium dioxide (Ti3C2Tx-TiO2) ternary hybrid foams for multi-scheme SDIWP. The RGO/Ti3C2Tx-TiO2 foam is prepared by freeze-drying induced self-assembly (FDISA) of Ti3C2Tx and graphene oxide (GO) nanosheets by which an in-situ redox reaction between Ti3C2Tx and GO nanosheets occurs and TiO2 nanoparticles are generated simultaneously. The synergistic effect leads to the formation of the semi-metallic RGO/Ti3C2Tx-TiO2 framework with the Ti–O-C covalent bonding between RGO and Ti3C2Tx. Under light irradiation, the photogenerated carriers in RGO/Ti3C2Tx-TiO2 can occupy the quantum-confined graphene-like states in RGO with an average lifetime of 0.8 ps, this value is 2 orders of magnitude shorter than that of GO and Ti3C2Tx. As a result, the RGO/Ti3C2Tx-TiO2 foam shows photocatalytic degradation activity and photothermal conversion ability, enabling multi-scheme SDIWP. Owing to its excellent photothermal properties and quantum-confined superfluidic structures, the RGO/Ti3C2Tx-TiO2 foam exhibits superior vapor generation performance (1.72 kg m–2 h–1). Furthermore, the photocatalytic evaporator can be remotely manipulated as a floating robot for water treatment through programmable light navigation via photothermal Marangoni propulsion. This work provides a new approach for developing robotic SDIWP systems.
Metasurface enabled broadband, high numerical aperture Laplace differentiator under multiple polarization illumination
Chen Zhou, Naseer Muhammad, Ruizhe Zhao, Yanjie Chen, Guangzhou Geng, Junjie Li, Xiaowei Li, Xin Li, Yongtian Wang, Lingling Huang
 doi: 10.1186/s43074-025-00168-5
Abstract(21) PDF(2)
Abstract:
Optical metasurfaces to perform optical analog spatial differentiation operations and image edge detection processing is a currently hot topic. However, some metasurface differentiators are limited by polarization dependence, narrow operating bandwidth, low numerical aperture (NA), requiring for additional polarization elements or digital processing, and under coherent light illumination conditions. Here, we use the optical angular dispersion effect based on resonant dielectric metasurface, to realize the Laplacian differential operation in the real space directly, which can address these critical metrics for p- and s-polarized light. Moreover, the broadband operating range of the metasurface differentiator can be obtained by exciting and detuning the electric toroidal dipole (ETD) and magnetic toroidal dipole (MTD) resonances. We experimentally demonstrate that azimuthal-insensitive Laplace differential operations and dual-polarization second-order two-dimensional edge detection with NA up to 0.64 and spectral bandwidths of nearly 100 nm from 750 to 850 nm. In addition, broadband incoherent and unpolarized edge detection experiments are also carried out with satisfactory performance. Our work will pave the way for free-space realization of high-efficiency, broadband parallel optical-computation and image-processing in machine-vision, biomedical, and optical microscopy.
Three-dimensional varifocal meta-device for augmented reality display
Yuzhou Song, Jiaqi Yuan, Qinmiao Chen, Xiaoyuan Liu, Yin Zhou, Jialuo Cheng, Shumin Xiao, Mu Ku Chen, Zihan Geng
 doi: 10.1186/s43074-025-00164-9
Abstract(77) PDF(3)
Abstract:
Augmented reality (AR) displays have gained significant attention for their ability to blend the real and virtual worlds seamlessly. However, they face challenges like the vergence-accommodation conflict and a limited eyebox. The AR community is actively seeking lightweight, integrative optical elements to overcome these limitations. In this study, we demonstrate a three-dimensional varifocal meta-device for AR display. The meta-device is composed of three cascaded metasurfaces with Moiré and off-center Fresnel lens phase profiles designed to dynamically manipulate the focus point in three-dimensional space. The cascaded metasurfaces are designed and fabricated by the TiO2 nanopillars with varying diameters, which are polarizationinsensitive for light field manipulation. The focal point position is precisely controlled by the relative rotation between the metasurfaces. The meta-device achieves an effective focal length ranging from 3.7 mm to 33.2 mm and can adjust the lateral focal point within the same range. The dynamic eyebox size varies from 4.2 mm to 5.8 mm. This lightweight, integrated meta-device is well-suited for various imaging applications, including AR displays, as it simultaneously addresses the vergence-accommodation conflict and expands the eyebox.
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