Article
Chemistry, Physical
Inge Nys, Peter Ropac, Brecht Berteloot, Miha Ravnik, Kristiaan Neyts
Summary: Novel electro-optic components with enhanced functionality can be designed by using well-designed anchoring patterns in a liquid crystal (LC) device. Two types of nematic LC diffraction gratings with varying periodicity are presented, manufactured with patterned photoalignment at the confining substrates. The surface anchoring periodicity can redirect the incident light into different diffraction orders, resulting in a scattering appearance of the grating. The structural and optical properties of the gratings can be tuned by applying an external voltage.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Optics
Soma Fujimori, Tomoyoshi Ito, Tomoyoshi Shimobaba
Summary: This paper proposes a method to reduce aliasing in Fresnel diffraction, which involves both scaling and shift. The proposed method is based on the sampling theorem and the Fourier shift theorem. Numerical verification and theoretical formulations demonstrate its effectiveness, with a limited increase in computation time and improved signal-to-noise ratio compared to the conventional method.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Multidisciplinary Sciences
Alex Dikopoltsev, Yonatan Sharabi, Mark Lyubarov, Yaakov Lumer, Shai Tsesses, Eran Lustig, Ido Kaminer, Mordechai Segev
Summary: Photonic time-crystals are spatially homogeneous media that exhibit periodic variations in their electromagnetic susceptibility, leading to temporal reflections and refractions of propagating waves. Free electrons in these crystals spontaneously emit radiation, with a significantly amplified emission process when associated with momentum-gap modes. Quantum interference between spontaneous emission and electron emission into the band modes suppresses the interdependent emission. Therefore, the study of free-electron physics in photonic time-crystals offers a platform to explore various exciting phenomena.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Optics
Krzysztof Patorski, Maria Cywinska, Piotr Zdankowski, Maciej Trusiak
Summary: This study proposes a design of 2D gratings with 2D sinusoidal-like transmittance for spectral analysis in a wide wavelength range by using the concept of multiplicative superimposition of two 1D binary amplitude gratings. The obtained trapezoidal transmittance function allows easy control of the distance between main diffraction orders in two perpendicular directions. Calculation and comparison of diffraction efficiencies and parameters with solutions reported in the literature validate the design considerations.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Hongnan Xu, Yue Qin, Gaolei Hu, Hon Ki Tsang
Summary: This paper presents a spectrometer design that surpasses the resolution-bandwidth limit, by tailoring the dispersion of mode splitting in a photonic molecule to identify spectral information at different free-spectral ranges (FSRs). Experimental results demonstrate that this approach can resolve arbitrary spectra with discrete, continuous, or hybrid features.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Yirong Xu, Shangyuan Li, Zhengyuan Zhu, Xiaoxiao Xue, Xiaoping Zheng, Bingkun Zhou
Summary: In this study, a photonic-assisted space-frequency two-dimensional (2D) compressive radar receiver is proposed to achieve high-resolution detection in wide-range scenarios. The system employs spatially adaptive photonic projection basis for compression in the space dimension and photonic compressive sensing for compression in the frequency dimension. The proposed receiver overcomes the resolution deterioration problem of existing photonic compressive receivers and enables wide-range radar detection and inverse synthetic aperture radar (ISAR) imaging with high resolution.
Article
Chemistry, Multidisciplinary
Yongjun Lim, Byungsoo Kang, Seung Jae Hong, Heeju Son, Eunji Im, Joona Bang, Seungwoo Lee
Summary: This article introduces a new method for manufacturing customized optical Fourier surfaces (OFSs) and proposes a soft molding strategy for the fabrication of transparent and flexible OFSs. This method not only reduces costs but can also be used for manufacturing augmented reality devices.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Fu-Li Hsiao, Chia-Ying Ni, Ying-Pin Tsai, Ting-Wei Chiang, Yen-Tung Yang, Cheng-Jui Fan, Hsuan-Ming Chang, Chien-Chung Chen, Hsin-Feng Lee, Bor-Shyh Lin, Kai-Chun Chan, Chii-Chang Chen
Summary: Photonic crystals with unique dispersion relation can be used to design miniaturized optical components for quantum computing. A half-waveplate element with a photonic crystal is designed to rotate the polarization direction of incident light on a waveguide. The polarization rotation length and the optical axis's angle can be effectively calculated using the dispersion relation of photonic crystals. Polarization rotators designed based on photonic crystal structures exhibit low insertion loss and favorable polarization rotation performance.
Article
Optics
Haitao Liu
Summary: The article introduces a novel extension of the C method to three-dimensional structures, enabling precise modeling of photonic structures with curved boundaries. Effective numerical methods are also proposed to address relevant issues.
Article
Materials Science, Multidisciplinary
Chii-Chang Chen
Summary: The birefringence of the polarization convertor in silicon-on-Insulator channel waveguide can be enlarged using photonic crystals, with the length to convert 100% input light to the orthogonal polarization as short as 3.4 micrometers. The device is suitable for use in integrated optical quantum computing systems.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Ting Wai Lau, Yong-Liang Zhang, Kin Hung Fung
Summary: The study examines a class of inhomogeneous chiral photonic crystals with topological nontrivial bands and edge modes using the approach of non-coordinate transformation optics. By transforming the crystals into achiral binary photonic crystals, closed-form solutions to the photonic bands are obtained, and topological edge modes can be accurately predicted by Zak phases developed from topological band theory for achiral binary photonic crystals.
Review
Optics
Young-Bin Kim, Jin-Woo Cho, Yun-Jo Lee, Dukkyu Bae, Sun-Kyung Kim
Summary: This report discusses the fabrication and applications of hollow cavities in different wavelength regions. Hollow cavities can serve as versatile optical platforms to address the limitations of optoelectronic devices, and they also have high elasticity to minimize the thermal stress caused by high temperatures.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Rene Barczyk, Nikhil Parappurath, Sonakshi Arora, Thomas Bauer, Laurens Kuipers, Ewold Verhagen
Summary: This study examines the signatures of topological light confinement in the leakage radiation of 2D topological photonic crystal cavities. The modes of resonators and their properties in real and momentum space are characterized, revealing their origin in the topological bandstructure. Hallmarks of topological protection in the loss rates are demonstrated.
LASER & PHOTONICS REVIEWS
(2022)
Article
Computer Science, Information Systems
Vivek S. Sharma, Kapil Kumar Nagwanshi, G. R. Sinha
Summary: This study compares the performance of 14 bandgap crystals and carries out the design and classification analysis of defective crystals. The effects of dielectric arrangement and rod-like dielectric structure on photonic bandgap are investigated, and classification performance using different algorithms is evaluated.
MULTIMEDIA TOOLS AND APPLICATIONS
(2022)
Article
Optics
Noah Hurley, Steve Kamau, Khadijah Alnasser, Usha Philipose, Jingbiao Cui, Yuankun Lin
Summary: Through holographic fabrication using nine beam interferences, we have successfully created three types of 3D GPSCs and observed their characteristic diffraction patterns. The fractional diffractions of these GPSCs result in merged diffraction spots into large-area zones.
Article
Chemistry, Multidisciplinary
Panaiot G. Zotev, Yue Wang, Luca Sortino, Toby Severs Millard, Nic Mullin, Donato Conteduca, Mostafa Shagar, Armando Genco, Jamie K. Hobbs, Thomas F. Krauss, Alexander I. Tartakovskii
Summary: Transition metal dichalcogenides are used to fabricate WS2 double-pillar nanoantennas with multiple Mie resonances, enabling Purcell enhancement and increased fluorescence. Postfabrication atomic force microscope repositioning and rotation achieve small gaps for potential applications such as strong Purcell enhancement and optical trapping. The study highlights the advantages of using transition metal dichalcogenides for nanophotonics by exploring applications enabled by their properties.
Article
Materials Science, Multidisciplinary
Augusto Martins, Kezheng Li, Guilherme S. Arruda, Donato Conteduca, Haowen Liang, Juntao Li, Ben-Hur Borges, Thomas F. Krauss, Emiliano R. Martins
Summary: Metasurfaces have great potential to provide new functionality for miniaturized and low-cost optical systems. This study investigates the influence of polarization control on the performance of form-birefringent metalens and shows that it can correct for both spherical and off-axis aberrations using a single element, while allowing switching between high resolution and wide field of view operation. This is an important step towards the integration of miniaturized optical systems.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Donato Conteduca, Guilherme S. Arruda, Isabel Barth, Yue Wang, Thomas F. Krauss, Emiliano R. Martins
Summary: Resonant photonic sensors have significant applications in personalized healthcare diagnostics and environmental monitoring. However, there is currently a lack of comprehensive theoretical models for understanding the impact of practical limitations such as losses. In this study, a new model is proposed, which reveals that losses have a stronger impact on the resonance amplitude than on the Q-factor. Furthermore, it is shown that optimizing the detection limit is achieved by balancing the Q-factor and amplitude, rather than maximizing the Q-factor.
Article
Optics
Felipe Bernal Arango, Filippo Alpeggiani, Donato Conteduca, Aron Opheij, Aobo Chen, Mohamed Abdelrahman, Thomas F. Krauss, Andrea Alu, Francesco Monticone, Laurens Kuipers
Summary: Near-field scanning optical microscopy is a powerful technique for imaging below the diffraction limit. In this study, a cloaked near-field probe is designed and fabricated by controlling and balancing its electric and magnetic polarizabilities through nanostructuring. The probe-induced perturbations are largely suppressed, allowing for non-invasive near-field optical microscopy of classical and quantum nanosystems.
Article
Optics
Jianchao Zhang, Haowen Liang, Yong Long, Yongle Zhou, Qian Sun, Qinfei Wu, Xiao Fu, Emiliano R. Martins, Thomas F. Krauss, Juntao Li, Xue-Hua Wang
Summary: Metalens research has made significant advances by designing polarization-insensitive dimer nano-antennas, which enables polarization-insensitive ultrahigh numerical aperture oil-immersion operation. This technology greatly improves efficiency at visible wavelength and has been successfully applied in confocal scanning microscopic imaging.
LASER & PHOTONICS REVIEWS
(2022)
Article
Multidisciplinary Sciences
Chupao Lin, Juan Santo Domingo Penaranda, Jolien Dendooven, Christophe Detavernier, David Schaubroeck, Nico Boon, Roel Baets, Nicolas Le Thomas
Summary: The authors developed a UV-compatible photonic integrated circuit for structured illumination microscopy on a conventional wide-field microscope. The photonic circuits, designed at a wavelength of 360 nm, enable super-resolved imaging with UV light and do not require modification of the traditional imaging protocol. As a biological application, the UV photonic chips revealed features that cannot be resolved using standard wide-field microscopy.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Guilherme S. Arruda, Donato Conteduca, Isabel Barth, Yue Wang, Thomas F. Krauss, Emiliano R. Martins
Summary: This paper investigates the angular tolerance of distributed resonances in metasurfaces that support BICs and GMRs, and compares the performance of perturbed structures with BIC resonances. The study finds that perturbed structures feature higher angular tolerance and can achieve high-Q resonances more suitable for applications.
Article
Biophysics
Giampaolo Pitruzzello, Steven Johnson, Thomas F. Krauss
Summary: Many novel susceptibility tests are being developed to tackle the worldwide problem of antimicrobial resistance. Electrical impedance is considered a fundamental indicator of bacterial viability and by studying the electrical response of individual bacteria to an antibiotic challenge, researchers can detect antimicrobial action close to its biological limit. The findings suggest that 60 minutes is the fundamental lower limit of response time for a realistic susceptibility test at clinically relevant antibiotic concentrations.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Donato Conteduca, Giuseppe Brunetti, Isabel Barth, Steven D. D. Quinn, Caterina Ciminelli, Thomas F. F. Krauss
Summary: Optical tweezers have greatly contributed to bioscience research by allowing the accurate study of biological particles. The focus has been on trapping individual particles, but biological systems are inherently heterogeneous, so studying variations within the same population is crucial. In this study, a resonant metasurface is experimentally demonstrated to trap a large number of nanoparticles in parallel, enabling large-scale multiplexed optical trapping at the nanoscale. This breakthrough will facilitate the study of heterogeneous biological systems.
Article
Engineering, Electrical & Electronic
Chupao Lin, David Schaubroeck, Roel Baets, Nico Boon, Nicolas Le Thomas
Summary: We propose a photonic integrated circuit design that adds practicality and new functionalities to optical applications like optical microscopy. This design enables the generation of a far-field structured UV illumination pattern with a fringe period of 370 nm, a fringe visibility of 0.83, and a radiant intensity of 0.49 mW. By using single mode waveguides with low propagation losses, diffraction gratings, a beam splitter, a phase shifter, fluorescent gratings, and a collecting lens, the current PICs experimentally demonstrate the Moiré pattern at the heart of optical resolution enhancement and achieve a doubling of optical resolution in the direction of illumination.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Samuel F. J. Blair, Joshua S. S. Male, Stuart A. A. Cavill, Christopher P. P. Reardon, Thomas F. F. Krauss
Summary: In this study, the structural, electrical, and optical properties of ITO were comprehensively investigated and their relationship with deposition conditions was demonstrated. Guided mode resonances were used to determine the dispersion curves of the deposited material, and these were correlated with structural and electrical measurements to extract relevant material parameters. The findings showed that the carrier density, mobility, plasma frequency, electron effective mass, and collision frequency varied with deposition conditions, and the high-frequency permittivity (e(8)) could significantly differ from the assumed constant value of e???????(8) = 3.9 in many papers. This analysis provides a valuable reference for the characterization of other transparent conducting oxides (TCOs) in photonics research.
Article
Biophysics
Shrishty Bakshi, Pankaj K. Sahoo, Kezheng Li, Steven Johnson, Michael J. Raxworthy, Thomas F. Krauss
Summary: Chronic wounds are often superficially assessed and lack proper analysis of wound biomarkers. This study introduces a novel therapeutic system that can non-invasively sample and quantify biomarkers, aiding in wound healing and treatment.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Soheila Kharratian, Donato Conteduca, Barbara Procacci, Daniel J. Shaw, Neil T. Hunt, Thomas F. Krauss
Summary: Vibrational spectroscopy is an important tool in chemical and biological analysis. However, when applied to dilute liquid samples, it suffers from low sensitivity due to short interaction lengths, small extinction coefficients, and low target molecule concentrations. In this study, a new type of surface-enhanced infrared absorption spectroscopy based on the resonance of a dielectric metasurface is introduced. It has been demonstrated that this method is suitable for probing the vibrational bands of dilute analytes with different spectral linewidths. The results show that the absorption signal is enhanced significantly, leading to a lower limit of detection compared to attenuated total reflection (ATR). Overall, this technique provides an important addition to the spectroscopist's toolkit, especially for probing dilute samples.
Proceedings Paper
Engineering, Multidisciplinary
D. Conteduca, G. Brunetti, G. Pitruzzello, K. Dholakia, T. F. Krauss, C. Ciminelli
Summary: Nanophotonic structures optimize optical forces for trapping at the nanoscale, and moving towards large multiplexed arrays is necessary for greater impact in biological studies. Dielectric metasurfaces show promise in achieving multiplexed trapping of >1000 particles with low total power, opening up new possibilities for biological studies on viruses and vesicles.
OPTICAL TRAPPING AND OPTICAL MICROMANIPULATION XIX
(2022)
Proceedings Paper
Optics
Zuyang Liu, Grigorij Muliuk, Jing Zhang, Gunther Roelkens, Nicolas Le Thomas, Roel Baets
Summary: This study presents a new post-processing approach to efficiently couple light in silicon nitride (Si3N4) photonic integrated circuits (PIC) via grating couplers. The approach involves the micro-transfer printing of thin-film apodised Si3N4 grating couplers with metallic bottom reflectors and adiabatic couplers onto the input and output of Si3N4 waveguides, enabling efficient coupling without compromising the rest of the PIC. Simulation results indicate high coupling efficiencies, and experimental data demonstrates significantly improved efficiency compared to standard designs.
INTEGRATED OPTICS: DEVICES, MATERIALS, AND TECHNOLOGIES XXVI
(2022)
