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Virtual lattice resonance of a single nanoresonator in a metal nanoslit

Physical Review A 2023年第3期107卷 033520-033520页

作者： Ofer Doron Tal Ellenbogen Faculty of Engineering Department of Physical Electronics Tel Aviv University Tel Aviv 69978 Israel Raymond and Beverly Sackler School of Physics & Astronomy Tel Aviv University Tel Aviv 69978 Israel Tel Aviv Center for Light-Matter Interaction Tel Aviv University Tel Aviv 69978 Israel

We study the transmission through a subwavelength metallic slit loaded with a single nanoresonator. To gain physical insight into the problem a theoretical model combining the dipole approximation and image theory is developed. The model shows that the coupling between the single nanoresonator and the slit's cavity modes serves as a localized analog to an infinite nanoresonator array. This virtual array supports a surface image-lattice resonance due to the coherent self-scattering of the single nanoresonator. Thereby, it may lead to the ability to mimic many recently reported intriguing physical phenomena of real surface-lattice resonances in nanoresonator arrays, by a single-subwavelength system. We specifically show that it leads to enhanced light-matter interaction, and to the appearance of an extraordinary transmission window. The theoretical results are in good agreement with full-wave numerical simulations.

关键词： Extraordinary optical transmission Nanoantennas Nanophotonics Plasmonics Metasurfaces Dipole approximation finite-difference time-domain method

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Frequency-selective spin-wave propagation in magnonic waveguide with a local laser-heated region

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Physical Review B 2023年第2期107卷 024427-024427页

作者： V. A. Gubanov V. V. Kruglyak S. E. Sheshukova V. D. Bessonov S. A. Nikitov A. V. Sadovnikov Magnetic Metamaterials Saratov State University 410012 Saratov Russia Department of Physics and Astronomy University of Exeter Exeter EX4 4QL United Kingdom Institute of Physics of Metals 620108 Ekaterinburg Russia Kotel'nikov Institute of Radioengineering and Electronics 125009 Moscow Russia

We report on the spin-wave propagation along a magnonic waveguide with a local area of decreased magnetization, which is induced by heating produced with a focused laser spot. A phase-sensitive Brillouin light scattering technique is used to image how the spin wave propagates along the waveguide with a local heat landscape. Frequency-selective signal propagation along the waveguide is demonstrated. Micromagnetic simulations reveal intermodal interference variation in the region after the heated area. The proposed way to reconfigure the magnetization landscape can be used in magnonic devices with frequency-selective spin-wave transport.

关键词： Brillouin scattering & spectroscopy Magnons Micromagnetism Spin waves Ferrimagnets finite-difference time-domain method Landau-Lifschitz-Gilbert equation

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Single-sized phase-change metasurfaces for dynamic information multiplexing and encryption

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Physical Review Research 2024年第2期6卷 023258-023258页

作者： Tingting Liu Jie Li Shuyuan Xiao School of Information Engineering Institute for Advanced Study Optoelectronic Sensor Devices and Systems Key Laboratory of Sichuan Provincial University College of Optoelectronic Engineering

Optical metasurfaces empower us to manipulate the electromagnetic space and control light propagation at the nanoscale, offering a powerful tool to achieve modulation of light for information processing and storage. In this paper, we propose a phase-change metasurface to realize dynamic multiplexing and encryption of near-field information. Based on the orientation degeneracy and polarization control governed by Malus's law, we elaborately design the orientation distribution of Sb2S3 meta-atoms with the same dimension to simultaneously satisfy the amplitude modulation requirements of three independent channels. Using the corresponding polarization control as decoding keys, three different nanoprinting images can be displayed, and these multiplexed images can be switched on and off by leveraging the reversible tunability of the Sb2S3 meta-atoms between the amorphous and crystalline states. With the unparalleled advantages of ultracompactness, simple design strategy, high information density and security, the proposed metasurfaces afford promising prospects for high-end applications in ultracompact and intelligent dynamic display, high-dense optical data storage, and optical information encryption.

关键词： Imaging & optical processing Nanophotonics Phase-change materials Polarization of light Chalcogenides Metasurfaces finite-difference time-domain method

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Suppression effect of the protective film on the defect-induced light field enhancement in optical films

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Applied Optics 2025年第20期64卷 5612-5616页

作者： Xiaoyan Yan Xiulan Ling Zhichong Shao Xubin Chen Key Laboratory of Instrumentation Science & Dynamic Measurement Ministry of Education and Key Laboratory of Science and Technology on Electronic Test & Measurement North University of China Taiyuan 030051 China School of Information and Communication Engineering North University of China Taiyuan 030051 China

Based on the electromagnetic field theory and finite-difference time-domain algorithm (FDTD), the suppression effects of the protective film on the light field enhancement induced by the metal defect and dielectric defect in the optical thin film are investigated, respectively. Then the refractive index and thickness of the protective layer on defect-induced light field enhancement were analyzed. It was concluded that the peak electric field induced by metal defects decreases with the increasing of the refractive index of the protective layer. For dielectric defects, there exists an optimal refractive index value to achieve the best suppression effect, and the optimal refractive index of the protective layer equals that of the dielectric defect. And regardless of the metal defect and dielectric defect, the thicker the protective layer thickness, the lower the defect-induced light field enhancement and the better the suppression effect. The modeling results help to understand the protective layer mechanism and develop technology to improve the laser-induced damage of optical films.

关键词： Field enhancement finite-difference time-domain method Laser damage Laser induced damage thresholds Refractive index Thin films

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Modeling spatiotemporal dynamics of chiral coupling of quantum emitters to light fields in nanophotonic structures

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Physical Review A 2023年第2期107卷 023502-023502页

作者： Jan Olthaus Maximilian Sohr Stephan Wong Sang Soon Oh Doris E. Reiter Institut für Festkörpertheorie Universität Münster 48149 Münster Germany School of Physics and Astronomy Cardiff University Cardiff CF24 3AA United Kingdom Condensed Matter Theory Department of Physics TU Dortmund 44221 Dortmund Germany

A quantum emitter placed in a nanophotonic structure can result in nonreciprocal phenomena like chiral light excitation. Here, we present a theoretical model to couple circularly polarized emitters described by the density-matrix formalism to the electromagnetic fields within a finite-difference time-domain simulation. In particular, we discuss how to implement complex electric fields in the simulation to make use of the rotating-wave approximation. By applying our model to a quantum emitter in a dielectric waveguide and an optical circulator, we show how the excitation of the quantum system depends on its position and polarization. In turn, the back-coupling can result in strongly asymmetric light excitation. Our framework and results will help better explain spatiotemporal dynamics of light fields in nanophotonic structures containing quantum emitters.

关键词： Chirality Light-matter interaction Photonics finite-difference time-domain method Two-level models

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Observing tunable evolutions of optical singularities by C2 symmetry breaking

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Physical Review B 2023年第16期108卷 165305-165305页

作者： Keda Wang Chunying Guan Shun Wan Tailei Cheng Jinhui Shi Jianlong Liu Key Laboratory of In-Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin 150001 China

Optical singularities of polarizations have received much interest owing to their extraordinary performances. Recently, it was reported that originating from high-order singularities, a variety of controllable developments of singularities could be achieved by reducing symmetries, providing a feasible way to produce and manipulate optical singularities in momentum space. However, there are rare investigations on evolutions of polarization singularities in the system with C2 symmetry transiting into no in-plane rotation symmetry. In this work, we realized adjustable evolutions of singularities through breaking C2 symmetry. The singularities including bound states in the continuum (BICs) and degenerate states occur in a C2 symmetry photonic crystal slab. The evolutions of singularities were attained during the process of symmetry transition by introducing a symmetry breaking factor. A process of off-ΓC points spawned from off-Γ BICs and merged to be quasi-BICs eventually were observed by increasing the symmetry breaking factor. In addition, an at-Γ quasi-BIC accompanied by a pair of C points and axis conversions of singularities were observed. Our observations could enrich the understanding of the evolution of optical singularities and supply a meaningful way to engineer optical singularities.

关键词： Microstructure Photonic crystals Polarization Confinement-induced resonance finite-difference time-domain method

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Probing Purcell enhancement and photon collection efficiency of InAs quantum dots at nodes of the cavity electric field

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Physical Review Research 2024年第2期6卷 L022004-L022004页

作者： Matthew Jordan Petros Androvitsaneas Rachel N. Clark Aristotelis Trapalis Ian Farrer Wolfgang Langbein Anthony J. Bennett School of Engineering Cardiff University Queen's Buildings The Parade Cardiff CF24 3AA United Kingdom Translational Research Hub Maindy Road Cardiff CF24 4HQ United Kingdom Department of Electronic and Electrical Engineering University of Sheffield Mappin Steet Sheffield S1 3JD United Kingdom EPSRC National Epitaxy Facility University of Sheffield Broad Lane Sheffield S3 7HQ United Kingdom School of Physics and Astronomy Cardiff University Queen's Buildings The Parade Cardiff CF24 3AA United Kingdom

The interaction of excitonic transitions with confined photonic modes enables tests of quantum physics and design of efficient optoelectronic devices. Here we study how key metrics such as Purcell factor, β factor, and collection efficiency are determined by the non-cavity modes that exist in real devices, taking the well-studied micropillar cavity as an example. Samples with dots at different positions in the cavity field allow us to quantify the effect of the non-cavity modes and show that the zero-phonon line and the phonon-assisted emission into the cavity mode HE11 is suppressed by positioning dots at the field node.

关键词： Light-matter interaction Quantum cavities Quantum optics Single photon sources Quantum dots Cavity resonators finite-difference time-domain method time-resolved photoluminescence

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Monolithic electric field control of a grating coupler for finely tuning wavelength, efficiency, and bandwidth

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Optics Letters 2025年第13期50卷 4370-4373页

作者： Yifan Zhang Yongyong Zhuang Liu Yang Xin Liu Qingyuan Hu Haochen Yan Hao Zhang Yaojing Zhang Shuangyou Zhang Pascal Del’Haye Xiaoyong Wei Zhuo Xu Electronic Materials Research Lab Key Lab of the Ministry of Education & International Center for Dielectric Research School of Electronic Science and Engineering Faculty of Electronic and Information Engineering Xi’an Jiaotong University Xi’an 710049 China Max Planck Institute for the Science of Light 91058 Erlangen Germany National Key Laboratory of Microwave Photonics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China School of Science and Engineering The Chinese University of Hong Kong Shenzhen (CUHK-Shenzhen) Guangdong 518172 China Department of Electrical and Photonics Engineering Technical University of Denmark Kgs. Lyngby 2800 Denmark

In this Letter, we propose a Pb(In 1/2 Nb 1/2 )O 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 -On-Insulator (PIN-PMN-PTOI) based apodized grating coupler through finite-difference time-domain (FDTD) simulations. By leveraging the ultrahigh electro-optic coefficient of PIN-PMN-PT single crystal, we demonstrate precise control over the effective refractive index, thereby fine-tuning the central wavelength, enhancing coupling efficiency (CE) and 3-dB bandwidth. Simulation results reveal that, under an external electric field, the center wavelength can be tuned from 1544.84 nm to 1553.36 nm, while the CE remains above 80%. The CE can be improved by 5.9%; the 3-dB bandwidth can be increased by 2.1 nm at 1550 nm. Our results show that PIN-PMN-PTOI-based gratings are promising for large-scale photonic chip integration with high CE and large bandwidth.

关键词： Coupling efficiency Effective refractive index finite-difference time-domain method Grating coupler Integrated photonics Photonic integrated circuits

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Interplay of bound states in the continuum empowers spectral-lineshape manipulation in all-dielectric metasurfaces

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Physical Review B 2023年第20期107卷 205422-205422页

作者： Qin-Ke Liu Xiao-Qing Luo Xiaofeng Xu Yan Li Weihua Zhu Zhiyong Chen W. M. Liu Xin-Lin Wang Hunan Province Key Laboratory for Ultra-Fast Micro/Nano Technology and Advanced Laser Manufacture School of Electrical Engineering University of South China Hengyang 421001 China School of Nuclear Science and Technology University of South China Hengyang 421001 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Mechanical Engineering University of South China Hengyang 421001 China

The bound states in the continuum (BICs) in optical metasurfaces have latterly received prominent attention for their ultrahigh quality factors and the promise that they hold for realizing lowthreshold nanolasers, high-harmonic generation, and slow-light devices. In this scenario, the flexible tuning of the BIC is at the heart of multifunctional and tunable metadevices underpinning the central role in the modulation of optical spectral responses. Most BIC-inspired works are limited to single types of BICs modes only affected by the structural perturbation without tunable functionality, while different types of BIC modes have received little attention in manipulating the spectral line shapes in optical metasurface. Here, we show that the simultaneous generation and tailored interplay of two types of BIC modes can empower the realization of tailorable spectral lineshape manipulation in all-dielectric metasurfaces. In particular, the magnetic symmetry-protected BICs and accidental BIC result from the preserved reflection symmetry and geometrical parameter perturbation, respectively. The varied asymmetric parameters and the polarization angle of the incident light are responsible for the generation and interplay of the symmetry-protected and accidental quasi-BIC modes. Additionally, the interplaying quasi-BICs enable the implementation of the dual-wavelength passive optical switches throughout the related telecom bands, and can exhibit the tunable spectral features of different types of Fano resonances and EIT analog-based slow-light effect. These results could offer exploration potential for the development of multifunction and high-performance metadevices.

关键词： Metasurfaces Nanophotonics finite-difference time-domain method

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Strong coupling in an Au plasmonic antenna–SiO2 layer system: A hybrid-mode analysis

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Physical Review B 2023年第12期107卷 125144-125144页

作者： Pavel Gallina Michal Kvapil Jiří Liška Andrea Konečná Vlastimil Křápek Radek Kalousek Jakub Zlámal Tomáš Šikola Central European Institute of Technology Brno University of Technology Purkyňova 123 612 00 Brno Czech Republic Institute of Physical Engineering Brno University of Technology Technická 2 616 69 Brno Czech Republic

A detailed analysis of the optical response of a system accommodating several coupled modes is needed for the complete understanding of the strong coupling effect. In this paper, we report on the analysis of scattering cross-section spectra of Au antennas on a SiO2 layer on a Si substrate in the IR region. A classical model of coupled oscillators is used for determining the resonant energies, damping rates, and coupling strengths of four phonon polariton modes in the SiO2 layer coupled to a localized surface plasmon mode in a Au antenna. The calculated Hopfield mixing coefficients then show the contribution of the individual uncoupled modes to the hybrid modes of the coupled system.

关键词： Nanoantennas Optical phonons Phonon polariton Plasmonics Surface plasmon polariton finite-difference time-domain method Fourier transform infrared spectroscopy

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