Article
Optics
Seungmin Lee, Gayeon Park, Seonho Kim, Yeonghwa Ryu, Jae Woong Yoon, Ho Sik Hwang, In Seok Song, Chang Sun Lee, Seok Ho Song
Summary: The research team demonstrates a new type of multifocal and extended depth of focus (EDOF) intraocular lenses (IOLs) embedding micro-thin geometric phase (GP) lens layers. The number of foci and light splitting ratio of the GP IOLs can be adjusted by changing the number of stacked GP layers and the thickness of each layer. It is expected that GP IOLs will alleviate the most common problems associated with multifocal and EDOF IOLs, blurred vision and photic phenomena caused by light scattering and posterior capsule opacification.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Engineering, Manufacturing
Murad Ali, Fahad Alam, Israr Ahmed, Bader AlQattan, Ali K. Yetisen, Haider Butt
Summary: The study demonstrates the feasibility of 3D printing optical devices like customized Fresnel lenses, with tailored materials and parameters for accurate geometric dimensions. The printed lenses offer promise for selective color filtering, focusing, and sensing applications, with potential for integration with active and passive optical sensors.
ADDITIVE MANUFACTURING
(2021)
Article
Optics
Lingshan Li, Shuojia Shi, Jihwan Kim, Michael J. Escuti
Summary: The geometric-phase lens (GPL), identified as a compelling solution in AR/VR/MR headsets, offers a small form factor compared to traditional refractive lenses. This study proposes a design of color-selective GPLs based on liquid crystals, exhibiting high chromatic efficiency spectra and compact dimensions.
Article
Multidisciplinary Sciences
Heewon Cho, Haw-Young Kwon, Amit Sharma, Sun Hyeok Lee, Xiao Liu, Naoki Miyamoto, Jong-Jin Kim, Sin-Hyeog Im, Nam-Young Kang, Young-Tae Chang
Summary: This study presents a fluorescent probe named CDr17 that selectively targets M1 macrophages. The probe shows potential for tracking M1 macrophages in vivo and provides a valuable tool for studying macrophage activation and function. The development of subset-specific probes is crucial for understanding the diverse roles of macrophages.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Sen Chen, Jie-Dong Bi, Guowen Ding, Shenyun Wang, Xin-Yao Luo
Summary: In this work, a transmission-type polarization-insensitive cross-polarization converter (CPC) based on frequency selective surface (FSS) is proposed. The FSS-based CPC utilizes the substrate integrated waveguide design to achieve highly efficient transmissive cross-polarization conversion. Experimental results demonstrate excellent agreement with numerical simulation results and theoretical predictions, with a peak cross-polarization conversion ratio of -0.27 dB at the operating frequency.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Feifei Liu, Dongyi Wang, Han Zhu, Xiyue Zhang, Tong Liu, Shulin Sun, Xinping Zhang, Qiong He, Lei Zhou
Summary: A generic approach for designing plasmonic lenses to generate predesigned vector surface plasmon polaritons (SPPs) vortices with high efficiencies is established. The devices, constructed with tailored meta-atoms, can convert normally incident circularly polarized light into desired vector SPP vortices due to phase and polarization matching. Experimental demonstrations of directional SPP conversion (coupling efficiency: 35%; utilization efficiency: 98%) and enhanced efficiency in generating vector SPP vortex pave the way for on-chip plasmonic devices to efficiently utilize SPPs with minimal footprints.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Multidisciplinary
Tristan Heider, Gustav Bihlmayer, Jakub Schusser, Friedrich Reinert, Jan Minar, Stefan Bluegel, Claus M. Schneider, Lukasz Plucinski
Summary: We demonstrate a new type of geometry-induced spin filtering effect in photoemission in the important quantum material WTe2. The effect arises from its low symmetry, which also gives rise to its exotic transport properties. Through laser-driven spin-polarized angle-resolved photoemission Fermi surface mapping, we observe highly asymmetric spin textures of electrons emitted from the surface states of WTe2. The effect is a manifestation of time-reversal symmetry breaking in the photoemission process and can only be influenced by special experimental geometries.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Ahmed A. Ibrahim, Hesham. A. Mohamed, Mahmoud A. Abdelghany, Emad Tammam
Summary: This paper presents a flexible monopole antenna design with frequency selective surface (FSS) for IoT applications. The antenna operates at three IoT frequency bands and achieves frequency reconfiguration using PIN diodes. A simple FSS surface is placed under the antenna to improve its gain. The antenna has demonstrated stable performance in both flat and bent states.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Eva Prinz, Grisha Spektor, Michael Hartelt, Anna-Katharina Mahro, Martin Aeschlimann, Meir Orenstein
Summary: By tailoring the local and global geometries of vortex generators, arbitrary switching in the delivered plasmonic angular momentum can be achieved, providing a new method for plasmonic manipulation. The precise control over the generation and rotation direction of high-order plasmonic vortices was demonstrated, as well as the capability to create complex topological fields.
Article
Nanoscience & Nanotechnology
Artur O. Slobodeniuk, Petr Koutensky, Miroslav Bartos, Frantisek Trojanek, Petr Maly, Tomas Novotny, Martin Kozak
Summary: By utilizing coherent optical interactions, the degeneracy of exciton energies in low-dimensional semiconductors can be lifted, leading to higher speed limits for conventional electronics.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Aniket Patra, Renuka Devi Pothuraju, Dhananjoy De, Vincenzo Caligiuri, R. Vijaya, Antonio De Luca, Roman Krahne
Summary: By coupling a metal-dielectric-metal (MDM) cavity with a Guided-Mode-Resonator (GMR) and tuning the thickness of the central metal, the mode coupling can be actively controlled. The observed modal anti-crossing in the GMR-MDM enables switching and multiplexing applications in optoelectronics.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Xinyao Wang, Runping Ye, Melis S. Duyar, Cameron Alexander Hurd Price, Hao Tian, Yanping Chen, Na Ta, Hao Liu, Jian Liu
Summary: In this study, mesoporous ZnCoSiOx hollow nanoreactors with different metal distributions and microenvironment were designed based on the diffusion behavior of metal species in confined nanospace. By using core@shell structured ZnCo-zeolitic imidazolate framework (ZIF)@SiO2 as a template and employing different synthesis methods, double-shelled hollow structures with well-distributed metal species and yolk@shell structures with a collective (Zn-Co) metal oxide as the yolk were successfully obtained. The catalytic performance of these nanoreactors in CO2 hydrogenation showed that the dispersion and location of active sites in the catalysts play a crucial role in determining the main products.
Article
Chemistry, Physical
Ravi Shankar Palani, Michael Mardini, Leo Delage-Laurin, Daniel Banks, Yifu Ouyang, Eric Bryerton, James G. Kempf, Timothy M. Swager, Robert G. Griffin
Summary: In this study, selective 2H labeling of BDPA was utilized to investigate the dynamic nuclear polarization (DNP) mechanism of the Overhauser Effect (OE) in insulating solids. It was found that the alpha and gamma 1H spins on the fluorene rings were responsible for generating a positive bulk polarization, while the phenyl 1H spins contributed negative enhancements that attenuated the OE-DNP. Phenyl-d5-BDPA showed over 50% improvement in OE-DNP enhancement compared to h21-BDPA, achieving a maximum of approximately 90 at 14.1 T and 5 kHz MAS.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Optics
Kyohei Yada, Atsushi Sakurai
Summary: The proposed wavelength-selective emitter using nanoslit graphene metasurface utilizes a graphene sheet, metallic slit, and dielectric layer to tailor radiative properties. Thanks to electromagnetic resonances of graphene, the emitter demonstrates high emissivity and a broad peak wavelength shift. This study may facilitate the initial design of wavelength-selective emitters using graphene metasurfaces.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Chemistry, Multidisciplinary
Shubo Geng, Hang Xu, Chun-Shuai Cao, Tony Pham, Bin Zhao, Zhenjie Zhang
Summary: Adsorption-based removal of carbon dioxide (CO2) from gas mixtures has shown great potential for solving energy security and environmental sustainability challenges. However, the current CO2-selective sorbents have limited selectivity due to the similar physicochemical properties between CO2 and other gases. In this study, a bioinspired design strategy is used to create a robust, microporous metal-organic framework (MOF) that selectively removes CO2 from various gas mixtures, achieving highly efficient CO2 separations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
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
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
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
Chemistry, Multidisciplinary
Satoshi Ishii, Min-Wen Yu, Kuo-Ping Chen, Tadaaki Nagao
Summary: This study experimentally demonstrates that non-metallic plasmonic material zirconium nitride (ZrN) can generate electric potential through plasmoelectric effect, providing possibilities for robust photoelectric devices working at off-resonances.
ADVANCED MATERIALS INTERFACES
(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
Chemistry, Multidisciplinary
T. K. N. Nguyen, F. Grasset, S. Cordier, N. Dumait, S. Ishii, H. Fudouzi, T. Uchikoshi
Summary: The electrophoretic deposition and photonic crystal structural engineering were used to study the light absorption and electronic conduction properties of a tin pyrophosphate semiconductor integrated with a hexamolybdenum cluster compound (Mo6 cluster). The size of the pores, surface modification, and chemical composition of the infiltration material in the inverse opal film were investigated to control the photonic bandgap and deposition efficiency of the Mo6 cluster. The photoactive Mo6 clusters acted as visible light harvesters, generating efficient photo-induced current through a slow photon effect at the edges of the photonic stopband.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Optics
Nicholaus Kevin Tanjaya, Keiichiro Toda, Takuro Ideguchi, Satoshi Ishii
Summary: Quantitative phase microscopy (QPM) is used in this study to determine the thermal conductivity and thermo-optic coefficient (TOC) of a transparent substrate. By measuring the phase difference induced by an external heating laser, the thermal conductivity and TOC are simultaneously extracted through modeling based on heat transfer and thermo-optic effect. The method shows potential for measuring thermal conductivities and TOCs of other transparent substrates and has advantages in terms of setup simplicity and modeling ease.
Article
Chemistry, Multidisciplinary
Cheng-Han Huang, Chia-Hung Wu, Rashid G. Bikbaev, Ming-Jyun Ye, Chi-Wen Chen, Tung-Jung Wang, Ivan V. Timofeev, Wei Lee, Kuo-Ping Chen
Summary: In this study, a graphene layer combined with a Tamm plasmon polariton (TPP) is proposed as a wavelength- and angle-selective photodetector. The graphene layer is located at the strong field confinement position, and the photocurrent response is significantly enhanced with increasing absorption. Moreover, the graphene-TPP photodetector has wavelength and angle selectivity, making it applicable in LiDAR detecting, sun sensors, laser beacon tracking, and navigational instruments in the future.
Article
Materials Science, Multidisciplinary
Satoshi Ishii, Nicholaus K. Tanjaya, Evgeniy Shkondin, Shunsuke Murai, Osamu Takayama
Summary: By varying the geometric parameters, the optical absorption and thermal conductivity of silicon hole and pillar arrays can be optimized. The thermal conductivity has a stronger influence on the photothermal heating effect than optical absorption. Pillar arrays exhibit a larger photothermal heating effect, while hole arrays are advantageous in applications requiring connectivity. This study provides guidance for the future design of periodic nanostructures for photothermal heating applications.
APPLIED MATERIALS TODAY
(2023)
Article
Energy & Fuels
Satoshi Ishii, David Hernandez-Pinilla, Nicholaus K. Tanjaya, Tadaaki Nagao
Summary: Passive radiative cooling during the day can be achieved with highly reflective sunlight and thermal radiation in the mid-infrared region. In this study, the low ultraviolet reflectance of a silver film is compensated by combining it with a distributed Bragg reflector (DBR) made of silica and tantalum dioxide multilayers. The samples exhibited high solar reflectance (0.987) and thermal emittance (0.852), and the addition of a polymer improved the thermal emittance (0.926) with a slight decrease in solar reflectance (0.007). Outdoor measurements confirmed the radiative cooling performance of the samples in summer.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
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)
Article
Chemistry, Physical
Min-Wen Yu, Yu-Tang Lin, Chia-Hung Wu, Tung-Jung Wang, Jhuang-Hao Cyue, Jun Kikkawa, Satoshi Ishii, Tien-Chang Lu, Kuo-Ping Chen
Summary: This work successfully controlled the number of sulfur vacancies in monolayer WS2 flakes synthesized by chemical vapor deposition (CVD), resulting in a difference in photoluminescence (PL) intensity. The sulfur vacancies introduce defect trap states that cause carrier recombination and reduce carrier drift to graphene, thus decreasing the photocurrent. Furthermore, the gate-tunable Fermi level of graphene allows tunable responsivity of the WS2-graphene photodetector.
APPLIED SURFACE SCIENCE
(2024)
