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Unraveling post-growth mechanisms of monolayer CsPbBr3 nanocubes:Laser-enhanced transformations and cathodoluminescence-electron microscopy correlations

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Journal of Energy Chemistry 2025年第1期100卷 146-156页

作者： Mingxing Li Xiaoge Wang Xiaofan Cao Zhiqun He Chunjun Liang Mingxing Chen Jing Ju Fangtian You Key Laboratory of Luminescence and optical Information Ministry of Education Institute of Optoelectronic Technology Beijing Jiaotong University Beijing National Laboratory for Molecular sciences (BNLMS) College of Chemistry and Molecular Engineering Peking University

Lead-halide perovskite nanoparticles（LHP NPs） are highly promising materials for next-generation displays and solid-state lighting due to their exceptional optical properties. However, their inherent instability presents a significant challenge. Recent advances have demonstrated that optoelectronic devices based on monolayer nanoparticle films exhibit both high luminescence efficiency and long-term *** research demonstrates that mobility limitations and anisotropic alignments in CsPbBr3nanocube monolayer films are key to their stabilization, hindering spontaneous growth through face-to-face fusion and resulting in the formation of connecting necks in a diagonal direction. Introducing laser irradiation confirmed this by significantly accelerating nanocubes growth, increasing mobility, and enhancing local structural ordering, leading to larger and more regularly shaped nanosheets. Fourier transform infrared spectroscopy and energy dispersive spectroscopy line-scan analyses indicated that laser irradiation did not disrupt the ligand structure. Transmission electron microscopy and correlative cathodoluminescence electron microscopy revealed the effects of post-growth and heterogeneous structures, including enhanced luminescence and inhomogeneous intensity in the nanosheets. These findings deepen the understanding of the post-growth mechanism of monolayer nanoparticles and the structure-emission correlation and highlight the unique role of laser irradiation in directing the formation of well-defined and regular nanostructures.

关键词： Post-growth mechanism Heterogeneous structure Single-particle spectroscopy Laser irradiation

Injection-switchable erbium-doped fiber laser with two output ports

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Chinese Optics Letters 2007年第2期5卷 96-98页

作者：陈达如秦山 centre for optical and Electromagnetic Research Joint Research Centre of Optical CommunicationsZhejiang UniversityHangzhou 310058

An injection-switchable erbium-doped fiber laser （EDFL） with two output ports based on a ring structure is proposed. Wavelength switching together with the switching of the dominating output port of the fiber laser is achieved by controlling the power of a tunable injection laser. The characteristics of the wavelength switching for different levels of the pump laser power and different wavelengths of the injection laser are studied experimentally.

关键词： Injection lasers Switching Wavelength

Ten-channel mode-division-multiplexed silicon photonic integrated circuit with sharp bends

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Frontiers of Information Technology & Electronic Engineering 2019年第4期20卷 498-506页

作者： Chen-lei LI Xiao-hui JIANG Yung HSU Guan-hong CHEN Chi-wai CHOW Dao-xin DAI centre for optical and Electromagnetic Research State Key Laboratory for Modern Optical InstrumentationCollege of Optical Science and Engineering Zhejiang University Ningbo Research Institute Zhejiang University Department of Photonics and Institute of Electro-optical Engineering Chiao Tung University

A multimode silicon photonic integrated circuit(PIC) comprising a pair of on-chip mode(de)multiplexers with 10-mode channels and a multimode bus waveguide with sharp bends is demonstrated to enable multi-channel on-chip transmissions. The core width of the multimode bus waveguide is chosen such that it can support 10 guided modes, of which there are four transverse-magnetic polarization modes and six transverse-electric polarization modes. This multimode bus waveguide comprises sharp bends based on modified Euler curves. Experimental results demonstrate that the present silicon PIC enables the 10-channel on-chip transmission with a low inter-mode crosstalk of approximately-20 dB over a broad bandwidth of 1520–1610 nm even when the bending radius of the S-bend is as small as 40 μm. Compared with a silicon PIC using a conventional arc-bend with the same bending radius, our proposed PIC demonstrates a significant improvement.

关键词： Silicon Multimode Waveguide Euler-bends

Aluminum nanocrystals evolving from cluster to metallic state:Size tunability and spectral evidence

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Nano Research 2022年第2期15卷 838-844页

作者： Hao Wu Xiaoyu Cheng Hongguang Dong Songjun Xie Sailing He National Engineering Research centre for optical Instruments College of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China Ningbo Research Iristitute Ningbo 315100China

Sub-3 nm aluminum(Al)nanocrystal is an emerging class of nanomaterial with properties distinct to noble metal *** complete solution synthesis of aluminum nanoclusters was recently reported,and their photoluminescence(PL)was observed for the first *** the moment,there exists no method to tune the size of ultrasmall aluminum nanocrystals in solution thus no knowledge on the boundary state between aluminum nanoclusters to plasmonic *** this work,it is demonstrated a study of size-controlled solution synthesis of ultrasmall aluminum nanocrystals with size controlled between -2.2 and -3.8 *** the size results in three sets of spectral responses:(1)absorption due to nascent plasmons generated at -340 nm for larger particles,confirmed by Mie theory calculations;(2)significant decreased quantum yield of PL from -7.8%to -2.4%,indicating reduced quantum confinement effects and increased metallicity;(3)drop of fluorescence lifetime was observed,especially when the diameter of aluminum nanoparticles was changed from -3.0 to -3.8 *** study provides experimental evidence and insights to the transitional state between aluminum nanoclusters and plasmonic nanoparticles,which seems to occur at size larger than gold nanoclusters.

关键词： aluminum nanocrystals plasmon nanoclustors photoluminescence

Ultra-broadband absorber based on cascaded nanodisk arrays

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Chinese Physics B 2022年第4期31卷 83-89页

作者： Qi Wang Rui Li Xu-Feng Gao Shi-Jie Zhang Rui-Jin Hong Bang-Lian Xu Da-Wei Zhang Engineering Research centre of optical Instrument and System the Ministry of EducationShanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China

An ultra-broadband perfect absorber consisting of cascaded nanodisk arrays is demonstrated by placing insulatormetal-insulator-metal nanodisks on insulator-metal film *** absorber shows over 90% absorption in a wavelength range between 600 nm and 4000 nm under transverse magnetic(TM) polarization,with an average absorptivity of 91.5%and a relative absorption bandwidth of 147.8%.The analysis of the electric field and magnetic field show that the synergy of localized surface plasmons,propagating surface plasmons,and plasmonic resonant cavity modes leads to the ultrabroadband perfect absorption,which accords well with the results of impedance-matched *** influences of structural parameters and different metal materials on absorption performance are ***,the absorber is polarization-independent,and the absorption remains more than 90% at a wide incident angle up to 400 under TE polarization and TM *** designed ultra-broadband absorber has promising prospects in photoelectric detection and imaging.

关键词： ultra-broadband absorption cascaded nanodiskarrays polarization-independent

Aberration-free two-thin-lens systems based on negative-index materials

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Chinese Physics B 2008年第3期17卷 954-959页

作者：林志立丁婕深张朴 centre for optical and Electromagnetic Research State Key Laboratory for Modern Optical InstrumentationZhejiang University

Since the complete correction of all five monochromatic Seidel aberrations for a singlet lens with random shape or a two-thin-lens system is unprocurable merely by using the conventional positive-index materials both in theory and practice, this paper proposes that when one or both of the two lenses is/are made from negative-index materials, an imaging system composed of a pair of spherical thin lenses is possible to form a real image, in air, free from all five monochromatic Seidel aberrations. The calculated numerical solutions to the structural parameters of such lens systems possessing superior performance are provided and examples of them are illustrated for the given combinations of the two lenses＇ refractive indices, including an ultimately-remote imaging system.

关键词： negative refraction negative-index materials Seidel aberrations thin lens

Silicon-based on-chip diplexing/triplexing technologies and devices

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science China(Information sciences) 2018年第8期61卷 18-32页

作者： Yaocheng SHI Jingye CHEN Hongnan XU centre for optical and Electromagnetic Research State Key Laboratory of Modern Optical InstrumentationZhejiang University

Wavelength-division-multiplexing(WDM) transceiver filters are one of the most essential components for realizing the fiber-to-the-home(FTTH) networks. In recent years, silicon photonics have provided a very attractive platform to build ultra-compact photonic integrated devices with CMOS-compatible processes. In this review, we focus on the recent progresses on diplexers/triplexers based on multimode interference couplers(MMI), and directional couplers(DC). The polarization-insensitive devices are also discussed.

关键词： wavelength division multiplexer multimode interference coupler directional coupler fiber-tothe-home silicon waveguide

High-dispersive mirror for pulse stretcher in femtosecond fiber laser amplification system

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Chinese Physics B 2022年第8期31卷 627-630页

作者： Wenjia Yuan Weidong Shen Chen Xie Chenying Yang Yueguang Zhang State Key Laboratory of Modern optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Science and Technology of Ministry of EducationCollege of Precision Instruments and Opto-Electronics EngineeringTianjin UniversityTianjin 300072China

We present a high-dispersive multilayer mirror for pulse stretching in a femtosecond fiber laser amplification *** designed mirror contains 54 layers with a total physical thickness of 7.3 μm, which can provide a positive group delay dispersion(GDD) of 600 fs2and a high reflectance over 99.9% from 1010 to 1070 nm. The samples were prepared by dual ion beam sputtering. The measured transmittance matches well with the theoretical result. The GDD characteristics of samples were tested by home-made white light interferometer. The measured GDD is higher than the design results,an average GDD of +722 fs2from 1010 nm to 1070 nm. The mirrors were employed in a Yb-doped large-mode-area photonic crystal fiber amplification system. An input pulse compressed by the gratings with autocorrelation function of83 fs is obtained with a stretched FWHM of 1.29 ps after 28 bounces between the dispersive mirrors. The results show that the multilayer dispersive mirror could be an effective and promising technique for pulse stretching in femtosecond amplification systems.

关键词： optical coatings dispersive mirror ultrafast optics pulse stretching

Bidirectional visible light absorber based on nanodisk arrays

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Chinese Physics B 2023年第3期32卷 68-71页

作者：王琦朱非凡李瑞张世杰张大伟 Engineering Research centre of optical Instrument and System the Ministry of EducationShanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China

A perfect bidirectional broadband visible light absorber composed of titanium nitride and tungsten nanodisk arrays is *** average absorption of the absorber exceeds 89%at 400 nm–800 nm when light is normally incident on the *** from the opposite direction(back-side)results in absorption of more than 75%.Through the theoretical analysis of the electric and magnetic fields,the physical mechanism of the broadband perfect absorption is attributed to the synergy of localized surface plasmons,propagating surface plasmons,and plasmonic resonant cavity ***,the absorber also exhibits excellent polarization-independence performance and a high angular tolerance of~30°for both front-and back-side *** designed bidirectional broadband visible light absorber here has wide application prospects in the fields of solar cells and ink-free printing.

关键词： bidirectional absorption broadband absorber polarization-independent nanodisk arrays