Article
Optics
Wule Zhu, Fang Duan, Kazuya Tatsumi, Anthony Beaucamp
Summary: This study proposes an unconventional monolithic honeycomb-like lens concept with topological degrees of design freedom, capable of achieving diffraction-limited achromatic performance. The honeycomb lens outperforms traditional aspheric lenses and commercial cascaded lenses in terms of full field of view performance. This topological honeycomb lens concept may offer inexpensive and compact achromatic optics for various applications such as consumer cameras, wearable optics, and virtual reality.
Article
Multidisciplinary Sciences
Corey A. Richards, Christian R. Ocier, Dajie Xie, Haibo Gao, Taylor Robertson, Lynford L. Goddard, Rasmus E. Christiansen, David G. Cahill, Paul V. Braun
Summary: In this study, the authors used subsurface 3D printing to fabricate compact and high-performance achromatic imaging micro-optics. These micro-optics, which integrate refractive and diffractive elements, demonstrate high focusing efficiencies, high numerical apertures, and low chromatic focusing errors, offering a promising pathway towards achromatic micro-optical systems.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Qian Xu, Ti Sun, Chinhua Wang
Summary: This study demonstrates achromatic imaging in the continuous broadband wavelength range with a single coded LC metalens. Both theoretical and experimental results show that the phase-coded LC lens exhibits great achromatic imaging behaviors in the visible wavelength range with a bandwidth of 134 nm and FOV of 24 degrees.
ACS APPLIED NANO MATERIALS
(2021)
Article
Physics, Applied
Shilin Luo, Fei Zhang, Xinjian Lu, Ting Xie, Mingbo Pu, Yinghui Guo, Yanqin Wang, Xiangang Luo
Summary: This paper designs a wide field-of-view metalens with a numerical aperture of 0.24, providing diffraction-limited field of view over 40 degrees at three discrete wavelengths. The metalens involves only a single layer of metasurface to correct aberration, simplifying the architecture compared with cascaded metalenses and conventional optical systems. Simulated results show great achromatic and diffraction-limited focusing performance, promising applications in various fields.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Zhaoyi Li, Peng Lin, Yao-Wei Huang, Joon-Suh Park, Wei Ting Chen, Zhujun Shi, Cheng-Wei Qiu, Ji-Xin Cheng, Federico Capasso
Summary: The study demonstrated the design of millimeter-scale diameter, high-NA, submicron-thin metasurface lenses and their application in a virtual reality system.
Article
Optics
Jin Chen, Hong Chen Chu, Yun Lai, Zhanwei Liu, Huanyang Chen, Mingji Chen, Daining Fang
Summary: This paper presents and fabricates a rectangular gradient refractive index lens based on Mikaelian lens, achieving high efficiency, broadband, achromatic high resolution focusing, and demonstrating great potential in high resolution imaging systems.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Haochen Zhang, Zuojun Zhang, Xiaoliang Ma, Mingbo Pu, Xiong Li, Yinghui Guo, Xiangang Luo
Summary: We propose a dual-band achromatic focusing metasurface based on polarization multiplexing and dispersion engineering. The metasurface utilizes anisotropic resonant phase meta-atoms for independent nonlinear phase manipulation along orthogonal directions. The study demonstrates the construction of the metasurface and broadband reflectarray antenna using a computer-assisted particle swarm optimization algorithm. Experimental results show that the metasurface achieves achromatic focusing and significant broadband reflection gains.
Article
Optics
Xinjian Lu, Yinghui Guo, Mingbo Pu, Yaxin Zhang, Zhu Li, Xiong Li, Xiaoliang Ma, Xiangang Luo
Summary: In this article, a single-layer broadband achromatic metasurface was proposed to achieve sub-diffraction focusing in the visible range. It is capable of generating sub-diffraction focal spots under left-handed circularly polarized incident light with arbitrary wavelength at the same focal plane, showing promising potentials in various applications.
Review
Chemistry, Analytical
Seongyi Han, Dakyeon Lee, Sungjee Kim, Hyung-Hoi Kim, Sanghwa Jeong, Jeesu Kim
Summary: This review focuses on various contrast agents used in photoacoustic imaging, including organic dyes, polymeric nanoparticles, gold nanoparticles, and other inorganic nanoparticles. By exploring the light absorption ranges of these agents, researchers are provided with insights and developments in contrast agents for photoacoustic imaging.
Article
Engineering, Electrical & Electronic
Jin Chen, Hongchen Chu, Yao Zhang, Yun Lai, Mingji Chen, Daining Fang
Summary: A new gradient refractive index (GRIN) lens design based on a modified refractive index (RI) profile of classical Luneburg lens was proposed, achieving highly efficient achromatic subdiffraction focusing and directive far-field radiation. The experimental results of the 3-D printed sample were consistent with theoretical predictions and numerical simulations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Chemistry, Multidisciplinary
Weibin Feng, Jianchao Zhang, Qinfei Wu, Augusto Martins, Qian Sun, Zhihao Liu, Yong Long, Emiliano R. Martins, Juntao Li, Haowen Liang
Summary: Chromatic aberration is a challenge for metalenses, but multiwavelength achromatic metalenses can overcome limitations and extend applications. A 1 mm diameter red-green-blue achromatic metalens doublet with a designed NA of 0.8 was successfully applied in a digital imaging system, showcasing its potential.
Article
Nanoscience & Nanotechnology
Xuemei Dai, Fengliang Dong, Kun Zhang, Dingpeng Liao, Sheng Li, Zhengguo Shang, Yi Zhou, Gaofeng Liang, Zhihai Zhang, Zhongquan Wen, Gang Chen, Luru Dai, Weiguo Chu
Summary: In this paper, a holographic approach for achieving multiwavelength achromatic subwavelength super-resolution focusing is proposed, and a high-numerical-aperture achromatic super-resolution metalens is demonstrated at five different wavelengths. This method shows potential value in super-resolution related applications.
Article
Nanoscience & Nanotechnology
Xiao-Qiang Jiang, Wen-Hui Fan, Lv-Rong Zhao, Xu Chen, Chong Qin, Hui Yan, Qi Wu, Pei Ju
Summary: A continuously varifocal and broadband achromatic metalens (CVBAM) is proposed to address the limited functionality of current broadband achromatic metalenses (BAMs). By employing a thermally tunable material, the CVBAM can correct chromatic aberration and achieve beyond the Abbe diffraction limit for THz waves. The work may provide an advanced scheme for designing tunable BAMs and facilitate the development of THz near-field imaging and spectroscopy systems.
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
(2023)
Article
Multidisciplinary Sciences
H. N. Chapman, S. Bajt
Summary: This study examines achromatic focusing systems for hard X-rays, consisting of a refractive lens paired with a diffractive lens. It takes into account the behavior of thick refractive lenses, such as compound refractive lenses and waveguide gradient index refractive lenses, to achieve high focusing resolution and relative bandwidth. The systems can be used for high-flux scanning microscopy and creating high intensities from attosecond X-ray pulses.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Physics, Applied
Jin Chen, Xudong He, Mingji Chen, Yongquan Liu
Summary: In this paper, the conformal transformation method (CTM) is applied to achieve highly efficient broadband flexural wave focusing in thin plates. By igniting evanescent waves at the interface of a conformally mapped Mikaelian lens, the proposed CTM successfully achieves high-resolution wave focusing with a full width at half maximum (FWHM) of around 0.2 lambda. The proposed Mikaelian lens, designed by linking refractive index with plate thickness, shows promising results for energy harvesting and medical imaging.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Review
Chemistry, Multidisciplinary
Haoran Ren, Stefan A. Maier
Summary: Twisted light, a helical spatial mode carrying orbital angular momentum, has great potential in optical and quantum information applications. However, current experiments are hindered by bulky, expensive, and slow-response optical elements. Nanophotonics offers a solution by providing compact and multifunctional devices for generating and detecting twisted light modes.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Boris Kalinic, Tiziana Cesca, Ionut Gabriel Balasa, Mirko Trevisani, Andrea Jacassi, Stefan A. Maier, Riccardo Sapienza, Giovanni Mattei
Summary: In this study, we combine quasi-BIC modes with nanogaps in silicon slotted nanoantennas to enhance the electromagnetic local density of optical states (LDOS) in the optically active region. This leads to a significant boosting of photoluminescence intensity and decay rate of Er3+ emission. The nanoantenna directivity is also increased, showing strong beaming effects.
Article
Chemistry, Multidisciplinary
Luca M. Berger, Malo Duportal, Leonardo de Souza Menezes, Emiliano Cortes, Stefan A. Maier, Andreas Tittl, Katharina Krischer
Summary: Electrocatalysis is crucial for achieving a zero-carbon future and driving research in hydrogen generation and carbon dioxide reduction. Surface-enhanced infrared absorption spectroscopy (SEIRAS) is a suitable method for investigating electrocatalytic processes but has limitations in detecting short-lived intermediates. A new nanophotonic-electrochemical SEIRAS platform has been developed to overcome these limitations and provide a deeper understanding of catalytic reactions.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Allison R. Pessoa, Jefferson A. O. Galindo, Luiz F. dos Santos, Rogeria R. Goncalves, Stefan A. Maier, Leonardo de S. Menezes, Anderson M. Amaral
Summary: Lanthanide-doped single dielectric nanoparticles are used for nanoscale temperature sensing with high resolution. However, the low number of emitters in individual nanocrystals requires higher excitation power densities, which can cause overlapping emissions and affect temperature measurements. This study demonstrates a method to separate and correct these overlapping bands, resulting in improved temperature readout accuracy and corrected thermal artifacts.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Optics
Milad Nonahal, Chi Li, Haoran Ren, Lesley Spencer, Mehran Kianinia, Milos Toth, Igor Aharonovich
Summary: Integrated quantum photonics (IQP) offers a practical and scalable approach to quantum computation, communications, and information processing. However, the limited range of materials for monolithic platforms has been a challenge. This study demonstrates the fabrication of IQP components from hexagonal boron nitride (hBN), including waveguides, microdisks, and photonic crystal cavities. The engineered circuitry using single-crystal hBN shows the potential of hBN for scalable integrated quantum technologies.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Physical
Thomas Weber, Lucca Kuehner, Luca Sortino, Amine Ben Mhenni, Nathan P. Wilson, Julius Kuehne, Jonathan J. Finley, Stefan A. Maier, Andreas Tittl
Summary: In this study, strong coupling in bound state in the continuum metasurfaces on nanostructured bulk WS2 is demonstrated, with sharp resonances, tailored linewidths, and controllable light-matter coupling strength.
Article
Physics, Multidisciplinary
Romain Tirole, Stefano Vezzoli, Emanuele Galiffi, Iain Robertson, Dries Maurice, Benjamin Tilmann, Stefan A. Maier, John B. Pendry, Riccardo Sapienza
Summary: A temporal version of Young's double-slit experiment shows interference in the frequency domain when light interacts with time slits produced by ultrafast changes in the refractive index.
Article
Chemistry, Multidisciplinary
Dmytro Gryb, Fedja J. Wendisch, Andreas Aigner, Thorsten Goelz, Andreas Tittl, Leonardo de S. Menezes, Stefan A. Maier
Summary: This study presents one of the geometrically simplest two-dimensional chiral metasurface platforms by arranging achiral dielectric rods in a square lattice and creating chirality through rotating individual meta-atoms. The chiroptical responses obtained from this design are stronger or comparable to more complex designs. Additionally, it is found that the resonances dependent on the arrangement are robust against geometric variations and exhibit similar behavior in experiments and simulations.
Article
Nanoscience & Nanotechnology
David A. Katzmarek, Andrea Mancini, Stefan A. Maier, Francesca Iacopi
Summary: This article presents a simple method for the direct synthesis of transfer-free, nanopatterned epitaxial graphene on silicon carbide on silicon substrates. By using common lithography and lift-off techniques, a catalytic alloy tailored for optimal SiC graphitization is patterned to form planar graphene structures on top of an unpatterned SiC layer. The method is compatible with both electron-beam lithography and UV-lithography, enabling the realization of graphene gratings with a minimum width/space of at least 100 nm at the wafer scale. The resolution is limited by the flow of the metal catalyst during the liquid-phase graphitization process, but it can be further improved through optimization of the metal deposition method and lift-off process.
Article
Multidisciplinary Sciences
Sultan Ben-Jaber, Daniel Glass, Thomas Brick, Stefan A. Maier, Ivan P. Parkin, Emiliano Cortes, William J. Peveler, Raul Quesada-Cabrera
Summary: Photo-induced enhanced Raman spectroscopy (PIERS) is a highly sensitive surface-enhanced Raman spectroscopy (SERS) technique for detecting ultra-low concentrations of organic molecules. This study compares PIERS with Vo-induced SERS approaches to further confirm the role of Vo in PIERS and presents a proposed mechanism and discussion on using PIERS as a probe to explore photocatalytic materials.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Luca M. Berger, Martin Barkey, Stefan A. Maier, Andreas Tittl
Summary: This article investigates an emerging class of metasurfaces that can control the coupling between bound states in the continuum (BICs) and the far field. It is demonstrated experimentally that these metasurfaces sustain angular-robust quasi-BICs in the mid-infrared spectral region. Compared to conventional alternatives, these metasurfaces exhibit superior performance, making them promising for applications in bio-sensing, optical devices, and photonic devices using focused light.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Simone Ezendam, Lin Nan, Ianina L. Violi, Stefan A. Maier, Emiliano Cortes, Guillaume Baffou, Julian Gargiulo
Summary: Metallic nanoparticles have strong photothermal responses, but measuring their temperature accurately is challenging. Anti Stokes thermometry is a label-free technique mainly used for single particles. This study introduces the theoretical framework to apply it to the collective heating of ensembles and demonstrates temperature measurements of arrays of Au nanodisks, which are validated with wavefront microscopy, showing excellent agreement.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Lucca Kuehner, Fedja J. Wendisch, Alexander A. Antonov, Johannes Buerger, Ludwig Huettenhofer, Leonardo de S. Menezes, Stefan A. Maier, Maxim V. Gorkunov, Yuri Kivshar, Andreas Tittl
Summary: This research introduces a novel nanofabrication approach to effectively control resonance features and nanophotonic functionalities in all-dielectric metasurfaces by unlocking the height of individual resonators. Using this approach, an optical all-dielectric metasurface with maximum intrinsic chirality is demonstrated, which selectively responds to light of a particular circular polarization depending on the structural handedness.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Jisoo Kim, Johannes Buerger, Bumjoon Jang, Matthias Zeisberger, Julian Gargiulo, Leonardo de S. Menezes, Stefan A. Maier, Markus A. Schmidt
Summary: In this study, the properties of the on-chip hollow-core microgap waveguide in the context of optofluidics were investigated. The waveguide allows for intense light-water interaction and has fast response times. Various absorption-related experiments demonstrated the spectroscopic capabilities of the nanoprinted waveguide, and time-resolved experiments showed improved diffusion times due to the lateral access provided by the microgaps. Overall, the microgap waveguide represents a promising pathway for on-chip spectroscopy in aqueous environments.