Article
Chemistry, Multidisciplinary
Dengchao Huang, Shilin Liu, Wei Li, Kang Yang, Ting Peng
Summary: This study introduces a novel hybrid metal-dielectric-metal nanoantenna structure that exhibits unique optical properties and achieves high-gain unidirectional forward scattering. The experimental results also demonstrate the ability of the nanoantenna to enhance the electric field in the gap and support unidirectional forward scattering when excited by light with different polarization directions. Furthermore, the analysis of different substrate materials reveals that the Ge substrate significantly improves the local electric field.
Article
Physics, Applied
Jian Chen, Zeqing Sun, Jing Rao, Danylo Lisevych, Zheng Fan
Summary: By exploiting field enhancement inside the metalens, breakthrough deep-subwavelength acoustic imaging is achieved with improved resolution, contrast, and working bandwidth. This method has the potential to greatly benefit various fields such as medical diagnosis and industrial nondestructive evaluation.
PHYSICAL REVIEW APPLIED
(2021)
Article
Nanoscience & Nanotechnology
Maosong Liu, Xin Jin, Shun Li, Jean-Baptiste Billeau, Tingyu Peng, Henan Li, Long Zhao, Zuotai Zhang, Jerome P. Claverie, Luca Razzari, Jianming Zhang
Summary: The recent application of localized surface plasmon resonances (SPRs) in metallic nanoparticles has led to the construction of plasmonic nanohybrids for heterogeneous photocatalysis. By encapsulating an Ag NP core with SiO2 and TiO2 layers, and Au NPs on the outer surface, an efficient plasmonic photocatalyst, Ag@SiO2@TiO2-Au, has been designed to enhance catalytic activity. The structure unit with strong scattering and field enhancement induced by a plasmonic resonator is shown to significantly boost photocatalytic activity for high H-2 production rates under visible light.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Review
Engineering, Electrical & Electronic
Peng Shi, Aiping Yang, Fanfei Meng, Jiashuo Chen, Yuquan Zhang, Zhenwei Xie, Luping Du, Xiaocong Yuan
Summary: This article reviews near-field techniques for measuring optical SOIs and their potential applications. It summarizes the importance of optical SOIs and their role in various light-matter interactions, followed by an overview of the theoretical basis and latest achievements of near-field measurement techniques, including NSOM, optical manipulations, nanoantennas, and specially designed nanoprobes. A comprehensive classification of all known methods for optical near-field measurements of light's SOI is presented, along with novel techniques identified for future applications.
PROGRESS IN QUANTUM ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Andreas Woeste, Germann Hergert, Thomas Quenzel, Martin Silies, Dong Wang, Petra Gross, Christoph Lienau
Summary: We report the first observation of the coupling of strong optical near fields to wavepackets of free, 100 eV electrons with <50 fs temporal resolution in an ultrafast point-projection microscope. Our results bring direct mapping of different vectorial components of highly localized optical near fields into reach.
Article
Physics, Multidisciplinary
Debao Wang, Jingwei Lv, Wei Liu, Yanru Ren, Wei Li, Xinchen Xu, Chao Liu, Paul K. Chu
Summary: In this study, a hybrid metal-dielectric nanoantenna is designed and analyzed, showing flexibility in exciting and manipulating the anapole modes and improving the near-field enhancement. The nanoantenna also demonstrates great performance in optical sensing.
Article
Nanoscience & Nanotechnology
Dandan Han, Sen Deng, Tianchun Ye, Yayi Wei
Summary: Plasmonic lithography can achieve sub-10 nm patterns, but suffers from poor pattern fidelity due to the near-field optical proximity effect (OPE). This study investigates the formation mechanism of near-field OPE and proposes methods to improve pattern quality through optimization of exposure dose.
MICROSYSTEMS & NANOENGINEERING
(2023)
Review
Optics
Li Hu, Zhiguang Sun, Yingdong Nie, Yingzhou Huang, Yurui Fang
Summary: Chiral near-fields, generated or enhanced by plasmonic and photonic nanostructures, serve as a bridge between chiral molecules and light wavelengths. They have significant applications in chiral molecule detection and optical force generation.
LASER & PHOTONICS REVIEWS
(2022)
Article
Multidisciplinary Sciences
Werner M. J. van Weerdenburg, Anand Kamlapure, Eirik Holm Fyhn, Xiaochun Huang, Niels P. E. van Mullekom, Manuel Steinbrecher, Peter Krogstrup, Jacob Linder, Alexander Ako Khajetoorians
Summary: We observe a threefold enhancement of the superconducting critical temperature and gap size in ultrathin epitaxial Al films on Si(111) approaching the 2D limit. We characterize the vortex structure using spatially resolved spectroscopy and find evidence of a paramagnetic Meissner effect originating from odd-frequency pairing contributions. These results highlight the influences of reduced dimensionality on a BCS superconductor and provide a platform for studying BCS superconductivity in large magnetic fields.
Article
Chemistry, Physical
Ankai Wang, Shengli Zou
Summary: The induced dipole of the central nanoparticle plays a key role in the enhancement factor of the radiative decay rate of emitters. The near-field coupling among multiple emitters will determine the magnitude and phase of the induced dipole of the central nanoparticle. When the magnitude of the induced dipole is much larger than those of the emitting dipoles, a high enhancement factor will be obtained, and the phase of the induced dipole is less important.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Dengchao Huang, Shilin Liu, Kang Yang
Summary: In this study, a hybrid nanoantenna composed of a dimer of core-dual shell nanoparticles called the metal-dielectric-metal (MDM) structure is proposed. The hybrid dimer shows unidirectional forward scattering and possesses high radiation directivity and low-loss features, which results in a significant improvement in radiation efficiency compared to pure dielectric or metallic dimers.
Article
Nanoscience & Nanotechnology
Daniela Simeone, Vittorianna Tasco, Marco Esposito, Mariachiara Manoccio, Daniela Lorenzo, Mario Scuderi, Antonio De Luca, Stefano Cabrini, Adriana Passaseo, Massimo Cuscuna
Summary: The high refractive index of native aluminum oxide helps to squeeze the plasmonic mode into extremely small volumes in close gap configurations, providing higher electromagnetic near-field confinement and enhancement in bowtie antenna gaps than achieved in pure aluminum.
Article
Optics
Jinyong Hu, Wangdi Bai, Chuxuan Tan, Yiming Li, Qi Lin, Lingling Wang
Summary: The electric field intensity from a metallic nanoantenna can be remarkably heightened through introducing a dielectric nanostructure to build a hybrid dielectric-metal nanoantenna. The hybrid nanoantenna, composed of a gold nanorod dimer and a slotted silicon nanodisk, exhibits an intensified resonant electric field intensity at the gap of the dimer nanoantenna, exceeding 30 times higher than that of the individual dimer nanoantenna. The field enhancement mechanism is primarily attributed to the mode coupling between plasmonic resonances of the gold nanoantenna and the radiationless anapole modes supported by the slotted silicon nanodisk.
OPTICS COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Aleksei Anopchenko, Sudip Gurung, Subhajit Bej, Ho Wai Howard Lee
Summary: Using electrodynamical description, an expression for the electric-field intensity enhancement (FIE) due to epsilon-near-zero (ENZ) polariton modes is presented. The study shows that FIE reaches a limit in ultrathin ENZ films, inversely proportional to ENZ losses. The research also predicts high values of FIE in ultrathin polar semiconductor films.
Article
Optics
Yaping Hou, Lin Cheng, Zhengji Wen, Tianlun Li, Jianyong Mao, Yunfan Xu, Fu Liu, Jiaming Hao, Weitao Jiang, Yanpeng Zhang, Lei Zhang
Summary: A sandwich-type nonlinear nanoantenna with a thin layer of epsilon-near-zero (ENZ) material is proposed, which can dynamically tune the far-field scattering via an all-optical approach. By combining the dependence of four fundamental Mie modes on refractive index and intensity-dependent refractive index change caused by nonlinear optical effect in ENZ material, the far-field scattering can be controlled by controlling the intensity of incident light. The proposed all-optical nonlinear nanoantennas have promising applications in all-optical light modulation for photonic devices.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Maowen Song, Di Wang, Zhaxylyk A. Kudyshev, Yi Xuan, Zhuoxian Wang, Alexandra Boltasseva, Vladimir M. Shalaev, Alexander V. Kildishev
Summary: Utilizing a surface-relief aluminum metasurface for polarization-tunable plasmonic colors enables high-density optical data storage through encoding information in nanopixels. This approach offers rapid parallel readout and dynamic image generation capabilities.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Shaimaa I. Azzam, Krishnakali Chaudhuri, Alexei Lagutchev, Zubin Jacob, Young L. Kim, Vladimir M. Shalaev, Alexandra Boltasseva, Alexander V. Kildishev
Summary: The research explores the interplay between electric and magnetic dipoles in arrays of dielectric nanoresonators, achieving high-Q factor resonances and forming different types of BICs through collective diffractive coupling. The resonances in the visible regime are utilized to achieve room temperature lasing with high spatial directionality and low thresholds. Experimental demonstration of multi-mode, directional lasing and study of BIC-assisted lasing mode engineering in arrays of dielectric nanoresonators show potential applications.
LASER & PHOTONICS REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Soham Saha, Aveek Dutta, Clayton DeVault, Benjamin T. Diroll, Richard D. Schaller, Zhaxylyk Kudyshev, Xiaohui Xu, Alexander Kildishev, Vladimir M. Shalaev, Alexandra Boltasseva
Summary: Modulation of dielectric permittivity enables control over the phase, amplitude, and polarization of light, crucial for tunable optical devices. This study reports significant permittivity changes induced by optically generated free carriers in zinc oxide thin films, with up to 70% broadband reflectance modulation in metal-backed mirrors.
Article
Computer Science, Interdisciplinary Applications
Qing Xia, Jeffrey W. Banks, William D. Henshaw, Alexander Kildishev, Gregor Kovacic, Ludmila J. Prokopeva, Donald W. Schwendeman
Summary: In this paper, a fourth-order accurate finite-difference time-domain scheme is described for solving dispersive Maxwell's equations with nonlinear multi-level carrier kinetics models. The scheme is based on a single-step three time-level modified equation approach and does not require nonlinear iterations. It can accurately treat curved interfaces between different materials and complex geometry using curvilinear grids and overset grids respectively. The numerical model obtained from this scheme is carefully verified and can be used for plasmonic applications such as nanolasing.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Zhaxylyk A. Kudyshev, Alexander V. Kildishev, Vladimir M. Shalaev, Alexandra Boltasseva
Summary: The Starshot lightsail project aims to build an ultralight spacecraft that can reach Proxima Centauri b in 20 years with propulsion from a high-power laser array. The project imposes extreme requirements on the lightsail's optical, mechanical, and thermal properties. The framework developed can optimize the lightsail's optical and opto-kinematic properties, opening up pathways to a multi-objective optimization of the entire lightsail propulsion system.
Article
Computer Science, Interdisciplinary Applications
Ludmila J. Prokopeva, Samuel Peana, Alexander Kildishev
Summary: This study presents an approach for adapting Gaussian dispersion analysis (GDA) to time-domain simulations, allowing efficient modeling of optical materials. The research develops a simplified model for materials with inhomogeneous broadening, and implements it in a finite-difference time domain (FDTD) solver. The use of causal Dawson-Gauss oscillators and a generalized dispersive material (GDM) model enables accurate and efficient simulation of light propagation in dispersive media.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Soham Saha, Mustafa Goksu Ozlu, Sarah N. Chowdhury, Benjamin T. Diroll, Richard D. Schaller, Alexander Kildishev, Alexandra Boltasseva, Vladimir M. Shalaev
Summary: The unique properties of emerging photonic materials, conducting nitrides and oxides, are explored in this study. The optical properties of polycrystalline titanium nitride and aluminum-doped zinc oxide can be controlled by tailoring the film thickness. The study demonstrates their potential for ENZ-enhanced photonic applications, including optical circuitry, tunable metasurfaces, and nonlinear optical devices.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yuhao Wu, Sarah N. Chowdhury, Lei Kang, Soham S. Saha, Alexandra Boltasseva, Alexander V. Kildishev, Douglas H. Werner
Summary: By exploiting the extreme light confinement observed in periodic photonic structures and the dynamic material properties of zinc oxide (ZnO), this study presents a hybrid metasurface with broadly tunable topological properties. The results demonstrate that this metasurface can greatly manipulate the polarization of near-infrared light and has the potential to be used in all-optical switchable devices.
Article
Optics
Colton Fruhling, Kang Wang, Sarah Chowdhury, Xiaohui Xu, Jeffrey Simon, Alexander Kildishev, Letian Dou, Xiangeng Meng, Alexandra Boltasseva, Vladimir M. Shalaev
Summary: Coherent random lasing in subwavelength quasi-2D perovskite films is observed and studied. Statistical analysis reveals Levy-like intensity fluctuations, replica symmetry breaking confirms random lasing, and spectral and spatial correlation techniques are used to study coherent modes. The observed coherent lasing modes are extended states that result from the random crystal grain structure during fabrication and out-compete diffusive lasing due to their coherence.
LASER & PHOTONICS REVIEWS
(2023)
Article
Nanoscience & Nanotechnology
Omer Yesilyurt, Samuel Peana, Vahagn Mkhitaryan, Karthik Pagadala, Vladimir M. M. Shalaev, Alexander V. V. Kildishev, Alexandra Boltasseva
Summary: This work proposes a neural network based inverse design technique for the realistic design and fabrication of single material variable-index multilayer films. By integrating simulated systematic and random errors, the same neural network that produced the ideal designs can be retrained to compensate for deposition errors and fabrication imperfections. This approach provides a practical and experimentally viable method for designing high-performance single material multilayer films for a wide range of applications.
Article
Multidisciplinary Sciences
Zhaxylyk A. Kudyshev, Demid Sychev, Zachariah Martin, Omer Yesilyurt, Simeon I. Bogdanov, Xiaohui Xu, Pei-Gang Chen, Alexander V. Kildishev, Alexandra Boltasseva, Vladimir M. Shalaev
Summary: One of the main characteristics of optical imaging systems is spatial resolution, which is restricted by the diffraction limit. Recently, classical and quantum super-resolution techniques have been developed to break the diffraction limit. We propose a machine learning-assisted approach for rapid antibunching super-resolution imaging, achieving a 12 times speed-up compared to conventional methods. This framework enables the practical realization of scalable quantum super-resolution imaging devices compatible with various quantum emitters.
NATURE COMMUNICATIONS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Soham Saha, Benjamin Diroll, Sarah N. Chowdhury, Alexander Kildishev, Richard Schaller, Zubin Jacob, Vladimir M. Shalaev, Alexandra Boltasseva
Summary: A novel approach has been proposed to control the speed of all-optical switches by adjusting the interaction between materials and probes.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Blake A. Wilson, Zhaxylyk A. Kudyshev, Alexander Kildishev, Sabre Kais, Vladimir M. Shalaev, Alexandra Boltasseva
Summary: The design framework utilizes D-Wave technology for global optimization of complex meta-devices, providing solutions to highly-constrained optimization problems in nanophotonics.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Omer Yesilyurt, Ludmila J. Prokopeva, Alexander Kildishev
Summary: The study focuses on the bianisotropic characterization of plasmon-enhanced Kerr nonlinearity. It suggests using an equivalent homogeneous film with effective nonlinear parameters to simplify simulations and substitute for plasmonic metasurfaces with enhanced nonlinearity.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Zhaxylyk A. Kudyshev, Demid Sychev, Zachariah Martin, Simeon Bogdanov, Xiaohui Xu, Alexander Kildishev, Alexandra Boltasseva, Vladimir M. Shalaev
Summary: The machine-learning assisted framework significantly speeds up image acquisition in super-resolution microscopy based on photon antibunching, compatible with a CW excitation regime and applicable to a wide range of quantum emitters.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
