Nederlands

The Institute of Physics, Chinese Academy of Sciences has made significant progress in the research of lithium niobate nanooptics

1028
2025-04-15 14:32:31
Bekijk vertaling

In recent years, breakthroughs in the preparation technology of lithium niobate single crystal thin films have greatly promoted the important application of lithium niobate crystals in micro nano optical devices such as optical metasurfaces. However, the high hardness and inactive chemical properties of lithium niobate crystals pose significant challenges to micro nano processing; In addition, conventional optical metasurface preparation materials are mostly limited to isotropic materials, and the birefringence characteristics of anisotropic lithium niobate crystals have not been systematically explored in the field of optical metasurfaces.

Li Junjie's team from the Institute of Physics of the Chinese Academy of Sciences/Micromachining Laboratory of the National Research Center for Condensed Matter Physics in Beijing has long focused on the research of micro/nano photonics device processing, design and function integration; In recent years, the team has conducted systematic research on lithium niobate nanooptics and made a series of important progress. Firstly, the team developed a multi-component gas co etching technology, achieving controllable processing of lithium niobate nanostructures (Figure a, Advanced Materials Technology 2024), 9, 2400318). Based on this etching technology, the team designed and processed a nonlinear hyper lens based on lithium niobate nanopore structure, achieving the function of up converting near-infrared beam frequency to ultraviolet band while focusing (Figure b, ACS Photonics 2025, doi. org/10.1021/acphotonics. 4c02259). Recently, the team discovered a new phenomenon caused by lithium niobate birefringence, which is the chiral optical response generated by non chiral structures.

The team established a dual-mode resonant coupled wave model that includes material birefringence response, and thus constructed lithium niobate nanostructures that exhibit non chiral characteristics in spatial structure (Figure c). Theoretical analysis shows that when the optical axis of lithium niobate crystal rotates to a specific angle, birefringence causes the mirror symmetry of the structure to break, and two nearly degenerate resonant states produce strong coupling effects. The hybrid resonance mode exhibits enormous chirality, producing a circular dichroism signal close to 1. In the experiment, the team used self-developed multi-component gas co etching technology to successfully process the designed lithium niobate nanostructure (Figure d), which has excellent surface smoothness and sidewall steepness. The spectral test structure confirmed the core result of the theoretical prediction, and the measured circular dichroism signal reached 0.53. The crystal structure of lithium niobate and the designed nanostructure are both non chiral, and the combination of the two can produce chiral optical response. This new phenomenon will inspire the design of new lithium niobate optical devices and has important scientific significance in the field of micro nano optics.

 



Figure a. Processing technology of lithium niobate nanostructures; b. Nonlinear superlenses; c. D. Theoretical design and experimental results of lithium niobate chiral metasurface

The research results were published in the recent Physical Review Letters 2025, 134, 113, 802 under the title "Chiral Resonant Modes Induced by Intrinsic Birefringence in Lithium Niobate Metasurfaces", and were included in this issue's Feature in Physics; The highlight column of the American Physical Society's Physics magazine wrote a special report titled "Birefringent Nanocubes Give Light a Circular Boost". The first author of this paper is Associate Researcher Wang Bo from the Microfabrication Laboratory, and the corresponding authors are Researcher Li Junjie and Associate Researcher Pan Ruhao. Zhu Tingyue, Master's student Liu Yunan, and Researcher Yang Haifang participated in the work. This work was supported by the National Natural Science Foundation of China, the National Key R&D Program of the Ministry of Science and Technology, the Chinese Academy of Sciences and the Huairou Comprehensive Extreme Conditions Experimental Device.

Source: opticsky

Gerelateerde aanbevelingen
  • The rare decay of the Higgs boson may point to physics beyond the standard model

    Particle physicists have detected for the first time a new decay of the Higgs boson, revealing subtle differences predicted by the standard model and potentially pointing to new physics beyond it. The research results are published in the journal Physical Review Letters.The theoretically predicted Higgs boson since the 1960s was finally discovered in the European CERN laboratory in 2012. As a quan...

    2024-01-26
    Bekijk vertaling
  • Trumpf collaborates with Mercedes Benz to focus on digital real-time laser maintenance

    In the era of smart factories, Mercedes Benz monitors all fast lasers in its global production network based on cloud, significantly improving system resilience and reducing the risk of machine downtime. The connection between the Mercedes Benz digital ecosystem MO360 and the Trumpf laser for digital prediction services has helped achieve very good dynamic maintenance, and achieved demand based ...

    2024-06-17
    Bekijk vertaling
  • A professor from Sun Yat sen University proposes a new clean energy technology for laser manufacturing

    Energy conversion technology is an important research direction in modern science and engineering. Scientists are exploring new catalytic chemical methods to achieve the conversion of energy chemicals, such as photocatalysis and electrocatalysis. However, these highly anticipated catalytic chemistry technologies still have some problems in practical applications, and there is still a certain dista...

    2024-06-13
    Bekijk vertaling
  • Emerging laser technologies for precise manufacturing of multifunctional nanomaterials and nanostructures

    The use of photons to directly or indirectly drive chemical reactions has fundamentally changed the field of nanomaterial synthesis, leading to the emergence of new sustainable laser chemistry methods for manufacturing micro - and nanostructures. The incident laser radiation triggers complex interactions between chemical and physical processes at the interface between solid surfaces and liquid or ...

    2024-08-05
    Bekijk vertaling
  • AWOL Vision will showcase cutting-edge laser projectors and award-winning innovations at CEDIA 2023

    AWOL Vision has announced that it will be showcasing the latest innovations in home entertainment at this year's CEDIA Expo in Denver, Colorado from September 7-9.At the show, AWOL Vision will debut the new LVV-3000 Pro and LVV-3500 Pro laser projectors with Dolby Vision and Control4 integration, and will showcase the latest Vanish TV, The TV recently received the prestigious "IFA 2023 Best of the...

    2023-09-08
    Bekijk vertaling