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
Optics
Andreas Erik Gejl Madsen, Rene Lynge Eriksen, Jesper Gluckstad
Summary: This study examines the use of a Convolutional Neural Network for generating digital holograms and compares it to state-of-the-art iterative methods. While the neural network outperforms the original GS algorithm in reconstruction quality, it lags behind in speed compared to modern optimized GS implementations.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
You Li, Junyong Zhang, Yanli Zhang, Shenlei Zhou, Dean Liu
Summary: The proposed method utilizes a phase-shifting Theon-ladder zone plate inserted at the Fourier plane of a Kepler telescope to obtain high-contrast and good quality interferograms, improving the reconstruction quality of the final image significantly. The interference contrast is optimized by generating interference patterns from multicopies of the object, with an equivalent experiment on USAF1951 resolution test target confirming the effectiveness of the method. This common-path setup not only maximizes the use of the detector screen but also provides high signal-to-noise ratio holograms.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Anthony Berdeu, Thomas Olivier, Fabien Momey, Loic Denis, Frederic Pinston, Nicolas Faure, Corinne Fournier
Summary: In-line digital holography is a powerful tool for imaging absorbing and phase objects, but the holograms can be corrupted by background signals. By using two holograms of the same object at different locations, an inverse problems approach can be applied to estimate the sample's complex transmittance and the contribution of background interference. Experimental results with stained bacteria demonstrate improved reconstructions of the sample while considering the background contribution.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Physics, Applied
Ashwini S. Galande, Vikas Thapa, Hanu Phani Ram Gurram, Renu John
Summary: Single-shot reconstruction of the inline hologram is achieved using the deep image prior (DIP) method integrated with the regularization by denoising (RED) approach. The use of alternating directions of multipliers method (ADMM) enables a robust single-shot phase recovery by combining DIP and RED. Experimental results demonstrate that sparsity-promoting denoisers outperform DIP in terms of phase signal-to-noise ratio (SNR), with the total variation denoiser being more suitable for hologram reconstruction.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Qiushuai Shi, Wangwei Hui, Kaicheng Huang, Hongyang Zhao, Qing Ye, Jianguo Tian, Wenyuan Zhou
Summary: Fourier Ptychographic microscopy has the ability to expand the space-bandwidth products of an imaging system, increase information acquisition efficiency, reduce overlapping rates, and solve pixel aliasing problems. The proposed algorithm achieved significant reduction in overlapping rate and noise suppression. With a spatial-sampling ratio of 0.72, satisfactory effects were achieved at the minimum overlapping rate of 24% in simulation.
OPTICS COMMUNICATIONS
(2021)
Article
Computer Science, Interdisciplinary Applications
Antonia Longo, Dominik Juestel, Vasilis Ntziachristos
Summary: In this study, we introduce a frequency-band model-based reconstruction method that can separate the frequency-band-specific components of optoacoustic imaging signals during image formation, thereby improving the contrast and fidelity of optoacoustic images and enabling accurate rendering of structures of all sizes.
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2022)
Article
Computer Science, Software Engineering
Praneeth Chakravarthula, Seung-Hwan Baek, Florian Schiffers, Ethan Tseng, Grace Kuo, Andrew Maimone, Nathan Matsuda, Oliver Cossairt, Douglas Lanman, Felix Heide
Summary: Holographic displays offer enhanced display capabilities in augmented reality applications, but the sampling of the holographic field by the eye pupil poses a challenge. This study introduces a pupil-aware holography approach that maximizes perceptual image quality regardless of the eye pupil's size, location, and orientation. Experimental results show that the proposed method eliminates severe artifacts and outperforms existing approaches.
ACM TRANSACTIONS ON GRAPHICS
(2022)
Article
Optics
Iksung Kang, Alexandre Goy, George Barbastathis
Summary: The study demonstrates that using a dynamic method is suitable for volumetric reconstruction under a limited-angle scheme, accurately reconstructing volume interiors under conditions of both weak and strong scattering.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Nabil Madali, Antonin Gilles, Patrick Gioia, Luce Morin
Summary: Object pre-localization from computer-generated holograms remains an open problem. This study proposes the use of hologram phase space representation to determine regions of interest for object localization. An iterative refinement method is used to improve the accuracy of depth estimation. Experimental results show improved calculation time and accuracy using the proposed methodology.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
Mostafa Agour, Claas Fallorf, Fatima Taleb, Enrique Castro-Camus, Martin Koch, Ralf B. Bergmann
Summary: This contribution demonstrates the first referenceless measurement of a THz wavefront using shear-interferometry. The technique utilizes a specific grating and imaging system parameters to generate shear, and employs an iterative algorithm for wavefront reconstruction.
Article
Computer Science, Interdisciplinary Applications
Dong Liu, Danping Gu, Danny Smyl, Anil Kumar Khambampati, Jiansong Deng, Jiangfeng Du
Summary: The study introduces a new shape-driven approach by transforming the shape to be reconstructed as basic primitives, using Boolean operations and Fourier representations, achieving shape and topology optimization in electrical impedance tomography (EIT).
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2021)
Article
Engineering, Electrical & Electronic
Dapu Pi, Juan Liu, Yongtian Wang
Summary: The intermediate angular-spectrum method is an efficient way to calculate computer-generated holograms without zero-padding and cropping operation. In this paper, an optimized iteration algorithm is proposed to improve the reconstruction quality. The method suppresses speckle noise by multiplying the quadratic phase with the target image, and improves the reconstruction quality by introducing the freedom domain. Numerical simulations and optical experiments demonstrate the effectiveness of the proposed method for high-quality reconstruction.
IEEE PHOTONICS JOURNAL
(2022)
Review
Physics, Multidisciplinary
M. Siano, B. Paroli, M. A. C. Potenza
Summary: Heterodyne Near Field Speckles are generated by interfering weak scattered fields with intense trans-illuminating beams, allowing for direct assessment of electric fields and having applications in various fields.
ADVANCES IN PHYSICS-X
(2021)
Article
Multidisciplinary Sciences
Niklas Lohaus, Florian Enderlin, Stephan Skawran, Alexander Maurer, Ahmad M. A. Abukwaik, Daniel Franzen, Martin W. Huellner, Michael Messerli
Summary: BSREM reconstruction method has a significant impact on quantitative and qualitative aspects of 2-[F-18]FDG-avid pulmonary nodules. The SUVmax of pulmonary nodules is significantly increased and the nodule conspicuity is significantly improved with BSREM compared to the conventional OSEM reconstruction method.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Di Xing, Cheng-Chieh Lin, Ya-Lun Ho, A. Syazwan A. Kamal, I-Ta Wang, Chia-Chun Chen, Cheng-Yen Wen, Chun-Wei Chen, Jean-Jacques Delaunay
Summary: Lead halide perovskites show exceptional optoelectronic performances and are considered promising for high-quality photonic devices such as single-mode lasers. A self-healing lithographic patterning technique using perovskite CsPbBr(3) nanocrystals has been demonstrated to achieve high-quality and high-crystallinity single-mode laser arrays, addressing the challenges in lithography of perovskites.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Chih-Zong Deng, Ya-Lun Ho, Hiroyasu Yamahara, Hitoshi Tabata, Jean-Jacques Delaunay
Summary: Near-zero-index materials and structures provide a potential approach for directional coupling and optical logic gates in photonic integrated circuits. The use of Bloch surface waves allows for increased propagation length.
Article
Physics, Applied
Bo-Wei Lin, Yi-Hsin Tai, Yang-Chun Lee, Di Xing, Hsin-Chang Lin, Hiroyasu Yamahara, Ya-Lun Ho, Hitoshi Tabata, Hirofumi Daiguji, Jean-Jacques Delaunay
Summary: Deep-UV surface-enhanced resonance Raman spectroscopy (SERRS) enables ultra-sensitive and selective molecule detection. A nanostructure consisting of black silicon and aluminum nanoparticles is reported for deep-UV SERRS characterization of biomolecules. The home-built deep-UV SERRS setup with this nanostructure achieves high-intensity and reproducible Raman signals.
APPLIED PHYSICS LETTERS
(2022)
Article
Biophysics
Yi-Hsin Tai, Shu-Cheng Lo, Kevin Montagne, Po-Cheng Tsai, Cheng-Chieh Liao, Sheng-Hann Wang, Iuan-Sheau Chin, Di Xing, Ya-Lun Ho, Nien-Tsu Huang, Pei-Kuen Wei, Jean-Jacques Delaunay
Summary: An osmium-coated lensed fiber probe and a silver-coated black silicon substrate were used to generate a dielectrophoretic force for trapping and detecting bacteria. By controlling the frequency of the AC voltage, bacteria concentration could be rapidly identified by recording the Raman peak variation.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Chemistry, Physical
Shubo Fei, Amer Alizadeh, Wei-Lun Hsu, Jean-Jacques Delaunay, Hirofumi Daiguji
Summary: Water adsorption in MIL-101(Cr) was studied through molecular simulations, revealing different pore-filling processes in the large, medium, and small cavities at varying pressures. The confinement effect on the structural properties of water and the role of stability of water clusters in the pore-filling processes were investigated. The formation of multimolecular water chains and clusters before condensation on inner surfaces of the cavities was observed.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
L. Denneulin, F. Momey, D. Brault, M. Debailleul, A. M. Taddese, N. Verrier, O. Haeberle
Summary: In this paper, an unsupervised regularized inversion method based on the GSURE estimator is proposed for reconstructing the 3D refractive index map of a sample in tomographic diffractive microscopy. The method automatically estimates optimal values for the hyperparameters of regularization terms and shows efficiency in finding suitable regularization weights, which is critical for reducing the required data and achieving faster yet efficient acquisitions and reconstructions.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2022)
Article
Nanoscience & Nanotechnology
Chia-Wen Kuo, Sheng-Hann Wang, Shu-Cheng Lo, Wei-Han Yong, Ya-Lun Ho, Jean-Jacques Delaunay, Wan-Shao Tsai, Pei-Kuen Wei
Summary: The study proposes a method for sensitive detection of small molecules by coupling image dipoles of gold nanoparticles with Fano resonance of capped gold nanoslits. The coupling mechanism was verified through calculations and experiments, showing potential for detecting low concentrations of small molecules. This resonant coupling significantly pushes the sensitivity boundary, with the detection limit reported to be 3 orders of magnitude lower than prism-based SPR.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Inorganic & Nuclear
Somayeh Sepehri, Ahmad Ahmadi Daryakenari, Behrooz Mosallanejad, Arash Montazeri, Hossein Ghafarian-Zahmatkesh, Shaghayegh Sadeghi Malek, Mohammad Ahmadi Daryakenari, Jean-Jacques Delaunay, Majid Yamini
Summary: A straightforward and cost-effective method was developed to fabricate supported NiO nanostructures on nickel foams. The fabricated electrodes exhibited excellent oxygen evolution reaction (OER) activity. The nanoleaf-like NiO electrocatalysts showed the best electrocatalytic performance.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Chemistry, Physical
Shubo Fei, Jiao Gao, Ryotaro Matsuda, Akira Endo, Wei-Lun Hsu, Jean-Jacques Delaunay, Hirofumi Daiguji
Summary: Investigations have shown that in MIL-101(Cr), the adsorption and desorption processes of water transition from a one-step to a two-step process with increasing temperature. This transition is related to the relative pressures for the transition between two different stable adsorption states in two different-sized mesopores.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Di Xing, Cheng-Chieh Lin, Ya-Lun Ho, Yang-Chun Lee, Mu-Hsin Chen, Bo-Wei Lin, Chun-Wei Chen, Jean-Jacques Delaunay
Summary: This study presents a pressure-assisted ligand engineering/recrystallization process for high-quality and well-thickness controlled CsPbBr3 QD film, demonstrating a low-threshold and single-mode plasmonic lattice laser.
Article
Materials Science, Multidisciplinary
Mu-Hsin Chen, Di Xing, Vin-Cent Su, Yang-Chun Lee, Ya-Lun Ho, Jean-Jacques Delaunay
Summary: The first BIC-based laser in the UV region is demonstrated by designing a 1D periodic resist structure on top of a GaN film. The laser has a directional single-mode lasing emission with a small full-width at half-maximum of 0.10 nm and beam divergence of 1.5 degrees. The wavelength control of the UV lasing is achieved by varying the period and temperature.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Physics, Applied
Ahmad Syazwan Ahmad Kamal, Cheng-Chieh Lin, Zhiyu Wang, Di Xing, Yang-Chun Lee, Mu-Hsin Chen, Ya-Lun Ho, Chun-Wei Chen, Jean-Jacques Delaunay
Summary: The recent development of perovskite-based lasers has highlighted their exceptional optical properties, including high absorption coefficient and high quantum yield. However, integrating these lasers on a chip in the form of high-density arrays is challenging due to positioning difficulties. This work demonstrates perovskite-based plasmonic lasers fabricated using the lithographic in-mold patterning method, utilizing CsPbBr3 perovskite nanocrystals and a plasmonic distributed Bragg reflector grating structure. The use of lithographic process enables fabrication and integration of lasers on a chip, allowing extensive applications in quantum optics and on-chip integrated photonics.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Asemare Mengistie Taddese, Nicolas Verrier, Mohamed Lo, Matthieu Debailleul, Olivier Haeberle
Summary: In this study, a high-resolution imaging method for optically birefringent samples is developed using a high-numerical aperture Jones TDM system and a polarized array sensor. The feasibility of the method is verified through image simulations and experiments.
Article
Nanoscience & Nanotechnology
Ying-Tsung Lee, Mu-Hsin Chen, Ya-Lun Ho, Zhiyu Wang, Yang-Chun Lee, Jean-Jacques Delaunay
Summary: In this study, an angle-sensitive chiral metamirror with Mie resonators is proposed to achieve handedness switching and excitation of circularly polarized emissions (CPEs) with opposite handedness at emission angles within 10 degrees.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Hsin-Chang Lin, Yang-Chun Lee, Cheng-Chieh Lin, Ya-Lun Ho, Di Xing, Mu-Hsin Chen, Bo-Wei Lin, Li-Yin Chen, Chun-Wei Chen, Jean-Jacques Delaunay
Summary: Researchers have developed a fabrication technique without etching step to create an on-chip photonic-plasmonic hybrid system, consisting of a perovskite lasing structure coupled to an LRSPP waveguide, which achieves a low lasing threshold and a long propagation length.