Article
Chemistry, Analytical
Jianping Yu, Jian Xu, Aodong Zhang, Yunpeng Song, Jia Qi, Qiaonan Dong, Jianfang Chen, Zhaoxiang Liu, Wei Chen, Ya Cheng
Summary: We propose a hybrid laser microfabrication approach for the manufacture of three-dimensional optofluidic spot-size converters. The method combines femtosecond laser microfabrication and carbon dioxide laser irradiation to create complex microchannel structures in glass and achieve size conversion by filling them with liquid-core waveguide solution. Experimental results demonstrate high conversion efficiency and low insertion loss of this method.
Article
Chemistry, Physical
Qiang Wei, Xiaofan Zhang, Fang Lin, Ruozheng Wang, Genqiang Chen, Hong-Xing Wang
Summary: This study fabricated two types of trenches with conventional vertical and new reverse-V-shaped cross-sections on single crystal diamond (SCD) substrate using a micro-jet water-assisted laser and microwave plasma chemical vapor deposition device. Raman and SEM methods were applied to analyze the growth layer characterization of both types. The findings showed that the epitaxial lateral overgrowth layer of the novel reverse-V-shaped trench improved the surface morphology and crystal quality of SCD.
Article
Optics
Yuchen Jie, Xiaotian Li, Zilong Zhang, Jie Wang, Yetong Hu, Yabi Li, Wei He, Changming Zhao
Summary: This paper introduces and realizes a 3D imaging method based on compressed sensing technology and dual-frequency laser phase ranging. The time-domain light intensity signal collected by a single-point detector is used for two-dimensional range reconstruction using compressed sensing algorithm. By solving the phase information of the two-dimensional spatial distribution in the time-domain signal, the 3D image information of the target scene is inverted, achieving the effect of scan-free 3D imaging. The feasibility of the system is verified through simulations and different reconstruction algorithms are compared. A non-scanning 3D imaging experimental platform is designed and built, successfully reconstructing 3D images of multiple objects with 32x32 resolution.
Article
Materials Science, Multidisciplinary
Piotr Augustyn, Piotr Rytlewski, Krzysztof Moraczewski, Andrzej Skibicki, Adam Mazurkiewicz
Summary: This study compared the laser ablation characteristics of commonly used thermoplastic materials and analyzed the impact of surface layer modification on surface free energy, wettability, and adhesive strength. The results showed that ABS, PS, PET, and PC had higher laser ablation dynamics than PLA and PA6. Surface modification significantly increased the adhesive strength, and near-infrared laser radiation was effective for surface layer modification and marking of ABS and PS materials.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Shijie Tu, Xin Liu, Difu Yuan, Wenli Tao, Yubing Han, Yan Shi, Yanghui Li, Cuifang Kuang, Xu Liu, Yufeng Yao, Yesheng Xu, Xiang Hao
Summary: This method improves the signal-to-background ratio in dense sample areas by dynamic phase switching, showing more advantages than software-based background subtraction algorithms.
Article
Optics
Zhe Lv, Kuo Zhang, Rui Bao, Hang Zhou, Ke Yang, Weiwei Li, Xinchen Du, Fei Chen
Summary: In this study, a four-interval theoretical model for dual-band cat-eye target echo detection was constructed using matrix optics theory and Collins diffraction integration method. The experiment was conducted using 10.6 um far-infrared waves and 532 nm visible light waves, and the collected data of echo power, radius, and target-missing quantities were compared with theoretical results. The findings provide insights into the distribution of the echo field, the impact of defocus values on the echo spot, and the relationship between incident angle and echo spot deviation, which are important for laser active detection and tracking of moving cat-eye targets.
Article
Optics
Zhihan Hong, Piaoran Ye, Douglas A. Loy, Rongguang Liang
Summary: A novel 3D printing process for glass micro-optics has been developed in this study, which can convert printed optical elements into transparent inorganic glass at low temperatures with specific performance indicators.
Article
Automation & Control Systems
Zhijia Zhao, Yiming Liu, Tao Zou, Keum-Shik Hong
Summary: An adaptive robust control technique is developed for an uncertain riser-vessel system in a three-dimensional space. A projection mapping technique and a hyperbolic tangent function are utilized to construct novel adaptive robust controllers based on dynamically updated adaptive laws. The stability of the closed-loop system is analyzed using Lyapunov's method.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2022)
Article
Chemistry, Multidisciplinary
Denitsa Baykusheva, Alexis Chacon, Jian Lu, Trevor P. Bailey, Jonathan A. Sobota, Hadas Soifer, Patrick S. Kirchmann, Costel Rotundu, Ctirad Uher, Tony F. Heinz, David A. Reis, Shambhu Ghimire
Summary: The study reports an anomalous nonlinear optical response of bismuth selenide, a prototypical three-dimensional topological insulator, during high-order harmonic generation. It was found that the generation efficiency increases with a change in laser polarization, reaching maximum efficiency under circular polarization. The anomalous enhancement observed encodes the characteristic topology of the band structure, originating from the interplay of strong spin-orbit coupling and time-reversal symmetry protection, with potential implications in ultrafast probing of topological phase transitions, light-field driven dissipationless electronics, and quantum computation.
Article
Chemistry, Analytical
Dabao Lao, Yukai Wang, Fang Wang, Chao Gao
Summary: This study presents a calibration method for laser 3D projection systems based on binocular vision, which is proven to be simple, efficient, and accurate.
Article
Materials Science, Coatings & Films
Aaqil Rifai, Daniel Creedon, Nhiem Tran, Maryam Hejazi, David Garrett, Andrew D. Greentree, Elena Pirogova, Alastair Stacey, Kate Fox
Summary: The desire for diamond as a conformal thin-film coating for 3D devices due to its extreme hardness, durability, and biocompatibility has led to recent advancements in microwave plasma CVD techniques. By using in-cavity Faraday cages to isolate the 3D samples from the microwave cavity, more uniform growth of CVD polycrystalline diamond coatings on complex-shaped structures has been demonstrated. This technique disrupts the distribution of the microwave plasma around the 3D structure but still allows for growth of relatively uniform micro-crystalline and faceted PCD films over the entire exposed 3D sample surface.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Mechanics
Hongyi Jiang
Summary: The study investigates the three-dimensional wake transition for flow past a diamond cylinder at different Reynolds numbers, revealing variations in wake characteristics such as mode swapping between modes A and B, as well as the gradual disorganization of mode B. It is found that there are major differences in wake properties between a diamond and a circular cylinder, with the decomposition of flow properties aiding in the understanding of these differences. The complex interactions between streamwise and spanwise vortices, as well as the wake transition and base-flow transition, are identified as factors that excite mode B and suppress the subharmonic mode.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Renato Grigolon Capelo, Juliana M. P. Almeida, Douglas Faza Franco, Gael Yves Poirier, Cleber Renato Mendonca, Marcelo Nalin, Danilo Manzani
Summary: Tellurite glasses, when doped with sulfide species, can be advantageous for the reduction of Te4+ to Te-0, which can be controlled through pulsed fs-laser processing. The reduction of tellurium to Te-0 nanocrystals in tellurite glass after laser irradiation was confirmed by Raman spectroscopy and TEM, allowing for the fabrication of waveguides and photosensitive materials for tridimensional data storage.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Physics, Multidisciplinary
Yiming Wang, Xiangxin Leng, Chenkai Zhang, Baoxiang Du
Summary: This paper introduces a novel three-dimensional chaotic system and its application in image encryption algorithm. A fast image encryption algorithm with an adaptive mechanism is developed based on the chaotic system, and a chaotic sequence generator is implemented using FPGA. Experimental results demonstrate the superior performance of this algorithm in terms of encryption speed and security.
Article
Materials Science, Multidisciplinary
Xiaomei Xu, Xu Chen, Yongquan Zhou, Yi Li, Mingjun Liu
Summary: The application of laser polishing in injection mold manufacturing faces the challenge of eliminating tensile residual stress on the polished cavity surface without using an annealing vacuum furnace. This study developed a fast laser annealing method using a dual-beam laser system to polish and anneal the mold cavity. The results showed a significant reduction in surface roughness and tensile residual stress, making laser polishing and annealing an effective technique in injection mold manufacturing.
Article
Optics
Nicolas Barre, Alexander Jesacher
Summary: Graded-index optical elements can shape light precisely and in specific ways. Recent advances in laser manufacturing offer possibilities for realizing three-dimensional graded-index volumes. This study presents an algorithmic approach for computing these elements, along with suitable cost functions for different designs.
Article
Optics
Nicolas Barre, Alexander Jesacher
Summary: We present an algorithmic approach for holographic shaping of partially coherent light, which can achieve individually optimized transformation for each mode using gradient descent and algorithmic differentiation.
Article
Multidisciplinary Sciences
Fabian Hinterer, Magdalena C. Schneider, Simon Hubmer, Montserrat Lopez-Martinez, Philipp Zelger, Alexander Jesacher, Ronny Ramlau, Gerhard J. Schuetz
Summary: Single molecule localization microscopy (SMLM) has the potential to resolve structural details of biological samples at the nanometer scale. By performing SMLM under cryogenic temperature, higher localization precision can be achieved. However, it is important to consider the anisotropic emission characteristics of dipole emitters with fixed orientation to fully exploit the resolution. This study demonstrates the use of astigmatic imaging and dipole orientation information to extract the position of dipole emitters without bias and reach a precision of 1 nm.
Article
Materials Science, Multidisciplinary
John Sandford O'Neill, Patrick Salter, Zimo Zhao, Bohan Chen, Hassan Daginawalla, Martin J. Booth, Steve J. Elston, Stephen M. Morris
Summary: Direct laser writing of multi-element diffractive optical components using two-photon polymerization is demonstrated in this study. The components can be switched on and off with an applied voltage. By utilizing the 3D capabilities of the laser microfabrication technique, multiple elements are written into a single liquid crystal layer. The switching behavior of the elements is controlled by changing the write-voltage during fabrication. These compact and transmissive optical components show great potential in applications that require switchability.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Jiahe Cui, Jacopo Antonello, Andrew R. Kirkpatrick, Patrick S. Salter, Martin J. Booth
Summary: This study reviews derivations modeling high-NA defocus and REM aberration, and demonstrates that optical remote-focusing and mechanical stage translation are not optically equivalent. It proposes the use of new orthogonal modes formulated with conventional Zernike modes to control high-NA remote-focusing and RIM correction as independent primary modes in combination with mechanical stage translation for aberration-free refocusing.
Article
Optics
Julian A. J. Fells, Patrick S. Salter, Chris Welch, Yihan Jin, Timothy D. Wilkinson, Martin J. Booth, Georg H. Mehl, Steve J. Elston, Stephen M. Morris
Summary: Dynamic time-resolved measurements of a multi-pixel analog liquid crystal phase modulator driven at a 1 kHz frame rate are presented. Using a heterodyne interferometer, two pixels can be interrogated independently and simultaneously, allowing for deconvolution of phase modulation with a wide bandwidth. The root mean squared optical phase error within a 30 Hz to 25 kHz bandwidth is <0.5 degrees and the crosstalk rejection is 50 dB. This technique is applicable to various types of optical phase modulators and spatial light modulators.
Article
Optics
Mohan Wang, Patrick S. Salter, Frank P. Payne, Adrian Shipley, Stephen M. Morris, Martin J. Booth, Julian A. J. Fells
Summary: This paper presents a novel design and laser writing technique for creating single-mode Bragg gratings in sapphire optical fibers. The resulting gratings have a narrow bandwidth and can withstand high temperatures, making them suitable for accurate sensing in extreme environments.
Article
Physics, Multidisciplinary
Maximilian Sohmen, Molly A. May, Nicolas Barre, Monika Ritsch-Marte, Alexander Jesacher
Summary: Adaptive optics (AO) is a powerful tool for increasing the imaging depth of multiphoton scanning microscopes. Dynamic Adaptive Scattering compensation Holography (DASH) is a fast-converging sensorless AO technique used for scatter compensation. This study investigates the performance of DASH under different turbidity conditions.
FRONTIERS IN PHYSICS
(2022)
Article
Optics
Bangshan Sun, Fyodor Morozko, Patrick S. Salter, Simon Moser, Zhikai Pong, Raj B. Patel, Ian A. Walmsley, Mohan Wang, Adir Hazan, Nicolas Barre, Alexander Jesacher, Julian Fells, Chao He, Aviad Katiyi, Zhen-Nan Tian, Alina Karabchevsky, Martin J. Booth
Summary: This paper reports a new method for femtosecond laser writing of optical-fiber-compatible glass waveguides, which enables high precision and low loss control of waveguide cross-sections. The fabricated waveguides show high refractive index contrast, low propagation loss, and low coupling loss, and they can operate across a broad range of wavelengths.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Crystallography
Bohan Chen, Zimo Zhao, Camron Nourshargh, Chao He, Patrick S. Salter, Martin J. Booth, Steve J. Elston, Stephen M. Morris
Summary: This paper demonstrates the fabrication of mechanically tunable diffraction gratings in stretchable LC gels using a combination of two-photon polymerization direct laser writing (TPP-DLW) and ultraviolet (UV) irradiation. The results show that a diffraction grating can be written using TPP-DLW in the presence of an electric field to align and lock-in the LC director in a homeotropic configuration. The paper also presents the change in the diffraction grating period and far-field diffraction pattern when the film is stretched or contracted.
Article
Materials Science, Multidisciplinary
Zimo Zhao, Bohan Chen, Patrick S. Salter, Martin J. Booth, Dominic O'Brien, Steve J. Elston, Stephen M. Morris
Summary: In this study, multi-element and multi-wavelength switchable Dammann gratings were fabricated using two-photon polymerization direct laser writing. The experiment demonstrated the potential of these switchable elements in programmable beam shaping, microscopy, and optical communication devices.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Optics
Simon Moser, Alexander Jesacher, Monika Ritsch-Marte
Summary: Optical Diffraction Tomography (ODT) is a label-free method to quantitatively estimate the 3D refractive index (RI) distributions of microscopic samples. A new and robust multi-slice model is proposed to efficiently model the tomographic image formation for strongly scattering objects illuminated over a wide range of angles, resulting in reconstructions of higher fidelity compared to conventional methods. Rigorous solutions to Maxwell's equations are used as ground truth for testing.
Article
Biochemical Research Methods
Maximilian Sohmen, Juan D. Munoz-Bolanos, Pouya Rajaeipour, Monika Ritsch-Marte, Caglar Ataman, Alexander Jesacher
Summary: Adaptive optics combined with multi-photon techniques allows for deep imaging of specimens. However, most current adaptive optics schemes rely on reflective or diffractive wavefront modulators, which can be a limitation. In this study, we present a sensorless adaptive optics scheme that is adapted for transmissive wavefront modulators. We demonstrate its effectiveness in scatter correction of two-photon-excited fluorescence images and benchmark it against a liquid-crystal spatial light modulator.
BIOMEDICAL OPTICS EXPRESS
(2023)
Article
Optics
Chao He, Jintao Chang, Patrick S. Salter, Yuanxing Shen, Ben Dai, Pengcheng Li, Yihan Jin, Samlan Chandran Thodika, Mengmeng Li, Aziz Tariq, Jingyu Wang, Jacopo Antonello, Yang Dong, Ji Qi, Jianyu Lin, Daniel S. Elson, Min Zhang, Honghui He, Hui Ma, Martin J. Booth
Summary: Advances in vectorial polarization-resolved imaging have important applications in physics and clinical diagnosis. By extracting metric indicators of vector properties, hidden optical properties can be directly indicated and intriguing asymmetry can be revealed.
ADVANCED PHOTONICS
(2022)
