Article
Optics
Baiqi Cui, Shaohui Zhang, Yechao Wang, Yao Hu, Qun Hao
Summary: A pose correction scheme based on camera calibration and homography transform approaches is proposed to improve the imaging performance of camera-scanning Fourier ptychography. This scheme achieves accurate alignment of data set and location error correction in the frequency domain, and when combined with a feature recognition algorithm, it optimizes reconstruction results and enables high-quality imaging.
Article
Engineering, Electrical & Electronic
Foez Ahmed, Muhammad U. Afzal, Dushmantha N. Thalakotuna, Karu P. Esselle
Summary: This article proposes a new dual-band metascreen (DBM) for polarization independent near-field phase corrections. The DBM is based on quad-layer phase-shifting cells with interlaced slot patterns to cater to different operating frequencies. The article also proposes a dual-band directive antenna using a dual-band metallic, partially reflective surface. Experimental tests of a prototype show excellent radiation performance and a low-profile, lightweight design.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Optics
Tomas Aidukas, Pavan C. Konda, Andrew R. Harvey
Summary: This study reports a new synthetic-aperture microscopy technique that uses multiple low-power microscope objectives and mutually incoherent detectors to synthesize wide-field, high-resolution images. Compared to conventional methods, this technique reduces image acquisition times by increasing the sampling area of the diffracted field and allows the use of low-cost 3D-printed components for calibration and reconstruction.
Article
Multidisciplinary Sciences
Siewert Hugelier, Wim Vandenberg, Tomas Lukes, Kristin S. Grussmayer, Paul H. C. Eilers, Peter Dedecker, Cyril Ruckebusch
Summary: In this research, the use of Whittaker smoothing is proposed to enhance SOFI signals by correcting photodestruction, particularly when it occurs rapidly. This method results in higher contrast images, strongly suppressed background, and more detailed visualization of cellular structures. Additionally, it is parameter-free, computationally efficient, and applicable to both two-dimensional and three-dimensional data.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Manoj Kumar, Lavlesh Pensia, Raj Kumar
Summary: A new configuration of a digital holographic system is proposed to double the camera field-of-view (FOV) of the existing setup. This is achieved by multiplexing the object beam with two different spatial frequencies using a Fresnel bi-prism. The feasibility of the proposed system is demonstrated experimentally, and its limitations and a method to overcome them are discussed. The system has practical applications in microscopy and optical metrology.
SCIENTIFIC REPORTS
(2022)
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
Viktor Vorobev, David Weidmann, Sergey Agdarov, Yafim Beiderman, Nadav Shabairou, Matan Benyamin, Florian Klampfl, Michael Schmidt, Dmitry Gorin, Zeev Zalevsky
Summary: This paper presents an approach for achieving full optical photoacoustic imaging with enhanced resolution utilizing speckle pattern analysis. The technique involves projecting patterns derived from binary masks onto the target to elicit a photoacoustic signal, which is then recorded and analyzed using correlation analysis of the speckle motion. The results demonstrate the feasibility of this optical approach for non-invasive medical imaging and other applications, providing enhanced resolution.
SCIENTIFIC REPORTS
(2023)
Article
Geochemistry & Geophysics
Yao Wang, Weiwei Liu, Weiwei Sun, Xiangchao Meng, Gang Yang, Kai Ren
Summary: This paper proposes a new superresolution network called PFESR, which addresses the challenge of large upscaling factors in superresolution. By using improved style transfer technology to generate auxiliary details, combining multiscale texture feature extraction and attention mechanisms, and solving the progressive fusion problem through hierarchical fusion, the method achieves state-of-the-art performance in 8x and higher scale superresolution tasks.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Physics, Applied
Hamidreza Taghvaee, Fu Liu, Ana Diaz-Rubio, Sergei Tretyakov
Summary: Breaking the diffraction limit on optical devices and achieving subwavelength focusing requires tailoring the evanescent spectrum of wave fields. This paper presents a feasible strategy based on the concepts of the perfect lens and power flow-conformal metasurfaces, allowing for subwavelength hotspot size in near-field focusing. The findings have potential applications in antennas, beam-shaping devices, nonradiative wireless power transfer systems, microscopy, and lithography.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Physical
T. M. Beardsley, M. W. Matsen
Summary: The order-disorder transition of diblock copolymer melts was evaluated using field-theoretic simulations for an invariant polymerization index, with particular focus on the complex phase window. The results support the understanding that the gyroid phase extends down to the ODT, and predict that the Fddd phase can survive fluctuation effects, which is consistent with experimental findings.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Optics
Caiyun Li, Zechao Liu, Yiyang Zhuang, Hongkun Zheng, Chen Zhu, Weiwang Hu, Jianguo Wang, Lingmei Ma, Yun-Jiang Rao
Summary: Fiber-optic distributed acoustic sensing (DAS) systems measure acoustic waves by demodulating the phase variations of Rayleigh backscattering (RBS) signals. However, environmental background interference and fading of RBS can introduce severe distortions, resulting in low signal to noise ratio (SNR). In this study, a novel method based on trend prediction is proposed to correct the distortions and improve the SNR of DAS in challenging applications with strong background interference.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Thermodynamics
Haotuo Liu, Kezhang Shi, Kun Zhou, Qing Ai, Ming Xie, Xiaohu Wu
Summary: This study found that the near-field radiative conductance (NFRHC) can be significantly enhanced by adding a third nanoparticle (NP) between two NPs, due to the excitation of localized hyperbolic polaritons (LHPs). The enhancement effect can be actively modulated by rotating the intermediate NP, thanks to the high directionality of the LHPs. Additionally, the effects of interparticle distance and vertical displacement on the NFRHC were also investigated, achieving an enhancement ratio of over 20,000, which is 38 times higher than previous works. This work demonstrates the potential of anisotropic hyperbolic polaritons in modulating near-field radiative heat transfer within many-body systems.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Optics
Alon Saguy, Felix Juenger, Aviv Peleg, Boris Ferdman, Elias Nehme, Alexander Rohrbach, Yoav Shechtman
Summary: ROCS microscopy is a label-free imaging technique that overcomes the optical diffraction limit by combining scattered laser light from different angles, while Deep-ROCS uses neural network technology to generate superior-resolved images more accurately. It can retrieve high-frequency information in a short period of time, demonstrating potential for complex structures.
Article
Optics
Haitang Yang, Yitian Liu, George V. Eleftheriades
Summary: We propose a generalized periodic super-oscillatory (SO) mask that can push the borders of the region of interest (ROI) away for imaging extended objects. Our experimental results demonstrate single-shot extended-object SO imaging with ROIs more than ten times the size of typical ROIs and a sub-wavelength resolution.
Article
Optics
Zhu Li, Changtao Wang, Yanqin Wang, Xinjian Lu, Yinghui Guo, Xiong Li, Xiaoliang Ma, Mingbo Pu, Xiangang Luo
Summary: This paper presents a design of a super-oscillatory metasurface doublet capable of achieving sub-diffraction focusing at high incident angles in the far field, with high efficiency and supporting numerical results. This technology may have potential applications in label-free super-resolution microscopy and optical precise fabrication.
