Article
Physics, Multidisciplinary
Yangyang Fu, Yuan Tian, Xiao Li, Shili Yang, Youwen Liu, Yadong Xu, Minghui Lu
Summary: In this study, a new method for achieving robust asymmetric generation of acoustic vortex field through dual-layer metasurfaces is introduced. This is achieved by controlling the intrinsic topologic charges and the parity of geometry design. The underlying physics is contributed to the one-way process of orbital angular momentum transition ensured by the broken spatial symmetry and the external topologic charge from the vortex diffraction. The novel phenomenon is experimentally demonstrated, providing new routes to manipulate the asymmetric response of vortex fields and potential applications in passive OAM-based diodes.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Wilton J. M. Kort-Kamp, Abul K. Azad, Diego A. R. Dalvit
Summary: Space-time quantum metasurfaces provide a compact platform for manipulating quantum light, allowing continuous tuning of coherent light-matter interactions in space and time. They enable arbitrary control of the spectral, spatial, and spin properties of nonclassical light, leading to tailored entanglement of single photon degrees of freedom and generation of steered and vortex photon pairs. These metasurfaces have the potential to enable novel photonic functionalities, such as encoding quantum information into high-dimensional color qudits and generating reconfigurable hyperentanglement for high-capacity quantum communications.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Changqing Li, Zhengyong Song
Summary: In this work, dynamically switchable metasurfaces based on vanadium dioxide are presented, achieving state switching of reflected wavefront for circularly polarized wave in the terahertz band. Phase modulation is achieved by rotating the vanadium dioxide strip, and the phase transition between metallic and insulating states enables the design of applications such as gradient metasurfaces, vortex beam generators, and reflective lenses with switchable focusing function.
OPTICS AND LASER TECHNOLOGY
(2023)
News Item
Optics
Spencer W. Jolly
Summary: A diffractive axicon can create intricate connections between topological charges and frequencies of ultrashort laser pulses, resulting in a diverse range of coiled light structures.
News Item
Optics
Philippe St-Jean
Summary: This paper presents a novel solid-state laser that can generate a large array of phase-locked optical vortices with tunable orbital angular momentum.
Article
Materials Science, Multidisciplinary
Guan-Hao Peng, Oscar Javier Gomez Sanchez, Wei-Hua Li, Ping-Yuan Lo, Shun-Jen Cheng
Summary: This study presents a systematic theoretical investigation of photoexcited valley excitons in TMD-ML's by polarized Laguerre-Gaussian beams, revealing the formation of superposition of finite-momentum exciton states.
Editorial Material
Optics
Gianluca Ruffato
Summary: A recent publication suggests a solution to overcome the limitations of optical techniques and high-intensity beams by probing highly-intense vortex pulses with a structured reference beam.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Xiang-Yu Zeng, Yu-Qin Zhang, Rui-Rui Zhang, Xiao-Rong Ren, Zi-Jun Zhan, Man-Na Gu, Rui Sun, Chun-Xiang Liu, Chuan-Fu Cheng
Summary: Metasurfaces with orthogonal nano-slit pairs arranged on spirals are proposed to generate vector beams of Bell-like states and slanted polarizations. The design is based on the theoretically derived parameter condition for manipulation of the two vector vortex modes, satisfied by matching the rotation order m, the spiral order n, and incident polarization helicity sigma. Linear polarization states of the vector beams are controlled by the initial orientation angle of slit pairs.
Article
Multidisciplinary Sciences
Feng Mei, Geyang Qu, Xinbo Sha, Jing Han, Moxin Yu, Hao Li, Qinmiao Chen, Ziheng Ji, Jincheng Ni, Cheng-Wei Qiu, Qinghai Song, Yuri Kivshar, Shumin Xiao
Summary: The authors demonstrate an efficient way to generate high-purity vortex beams by applying optical neural networks to cascaded phase-only metasurfaces. Specifically, they present record-high-quality Laguerre-Gaussian (LGp,l) optical modes with polynomial orders p = 10 and l = 200 with purity in p, l and relative conversion efficiency of 96%, 85%, and 70%, respectively.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Cormac McDonnell, Junhong Deng, Symeon Sideris, Tal Ellenbogen, Guixin Li
Summary: The use of broadband THz emitters based on Pancharatnam-Berry phase nonlinear metasurfaces allows for precise control and tuning of THz waves.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Xinjian Lu, Yinghui Guo, Mingbo Pu, Yaxin Zhang, Zhu Li, Xiong Li, Xiaoliang Ma, Xiangang Luo
Summary: In this article, a single-layer broadband achromatic metasurface was proposed to achieve sub-diffraction focusing in the visible range. It is capable of generating sub-diffraction focal spots under left-handed circularly polarized incident light with arbitrary wavelength at the same focal plane, showing promising potentials in various applications.
Article
Chemistry, Multidisciplinary
Min Wang, Lieyu Chen, Duk-Yong Choi, Shuangyin Huang, Qiang Wang, Chenghou Tu, Hua Cheng, Jianguo Tian, Yongnan Li, Shuqi Chen, Hui-Tian Wang
Summary: Twisted photons have the potential to carry an unlimited amount of orbital angular momentum (OAM), which is crucial for quantum communication and testing quantum theory. However, current methods for characterizing OAM quantum states have limitations in miniaturization. This study presents a scheme using all-dielectric metasurfaces composed of birefringent meta-atoms to reconstruct the density matrix of single photon OAM quantum states. The researchers also measured the Schmidt number of OAM entanglement by multiplexing multiple degrees of freedom. This work represents a step towards practical applications of quantum metadevices in free-space quantum imaging and communications.
Article
Nanoscience & Nanotechnology
Hongtao Wang, Hao Wang, Qifeng Ruan, John You En Chan, Wang Zhang, Hailong Liu, Soroosh Daqiqeh Rezaei, Jonathan Trisno, Cheng-Wei Qiu, Min Gu, Joel K. W. Yang
Summary: By miniaturizing spiral phase plates and integrating them with structural colour filters, we have successfully generated coloured orbital angular momentum beams using incoherent white light. These beams, which possess both spatial and temporal coherence, can independently generate multiple helical eigenstates and combine colour information into orbital angular momentum beams.
NATURE NANOTECHNOLOGY
(2023)
Article
Optics
Zhibing Liu, Jiahui Zou, Zhaoyu Lai, Jiajing Tu, Shecheng Gao, Weiping Liu, Zhaohui Li
Summary: This paper analyzed the distortion of Optical Coordinate Transformation (OCT) in the field of orbital angular momentum (OAM) (de)multiplexing or manipulation, proposed an optimization scheme to improve the distortion, and validated the effectiveness of the method through experiments using phase masks realized by metasurfaces.
Article
Optics
Shunli Liu, Jincheng Ni, Cong Zhang, Xinghao Wang, Yang Cao, Dawei Wang, Shengyun Ji, Deng Pan, Rui Li, Hao Wu, Chen Xin, Jiawen Li, Yanlei Hu, Guixin Li, Dong Wu, Jiaru Chu
Summary: The twisted stereometamaterials proposed in this study can generate OAM-dependent tailorable vortical dichroism ranging from -97% to +98%. By adjusting the geometrical parameters and symmetry of these materials, the spectral characteristics of VD measurements such as sign, magnitude, and position can be flexibly controlled.
LASER & PHOTONICS REVIEWS
(2022)
Article
Biochemistry & Molecular Biology
Denver P. Linklater, Phuc H. Le, Arturo Aburto-Medina, Russell J. Crawford, Shane Maclaughlin, Saulius Juodkazis, Elena P. Ivanova
Summary: A biomimetic nanostructured surface inspired by dragonfly wings was developed, which exhibited antifungal and fungicidal properties by physically rupturing attaching fungal spores upon contact. The hydrophilic nature of the nanostructured surface was found to be crucial for its antifungal activity.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Optics
Meguya Ryu, Molong Han, Lina Grineviciute, Jingwen Hu, Tania Moein, Reo Honda, Tomas Katkus, Mark J. Tobin, Jitraporn Vongsvivut, Tomas Tolenis, Yoshiaki Nishijima, Soon Hock Ng, Saulius Juodkazis, Junko Morikawa
Summary: The birefringence analysis of SiO2 films deposited at a glancing angle of 70° on resist pillar arrays and nanopatterned SiO2 substrates is carried out using spectral and color imaging modes. The films can be distinguished based on retardance and birefringence using RGB numerical analysis. By inserting a λ/2 waveplate and rotating the birefringent sample, the range of chromaticity xy-coordinates is increased, facilitating a better determination of birefringence.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Shivasubramanian Gopinath, Praveen Periysamy Angamuthu, Tauno Kahro, Andrei Bleahu, Francis Gracy Arockiaraj, Daniel Smith, Soon Hock Ng, Saulius Juodkazis, Kaupo Kukli, Aile Tamm, Vijayakumar Anand
Summary: In this study, a large-area diffractive lens with three sub-aperture diffractive lenses was realized using a Golay-like configuration, which relaxes the fabrication constraints and improves the imaging resolution. The computational optical experiments demonstrated enhanced optical and computational imaging resolutions compared to previous studies.
Article
Optics
Yi-shi Xu, Zhen-ze Li, Zi-han Wang, Hong Xia, Yue-feng Liu, Saulius Juodkazis, Qi-dai Chen, Lei Wang
Summary: Femtosecond laser-induced deep-subwavelength structures have gained attention as a nanoscale surface texturization technique. Non-reciprocal writing via tailored optical far-field exposure is demonstrated, achieving continuous manipulation of ripple period on indium tin oxide (ITO) film. A full electromagnetic model is developed to explain the formation of ripples and the asymmetry of focal spot determines the non-reciprocity. This non-reciprocal writing technique offers new possibilities for precise and controllable nanoscale surface texturing.
Article
Optics
Yi-Shi Xu, Zhen-Ze Li, Hua Fan, Yue-Feng Liu, Hong Xia, Saulius Juodkazis, Qi-Dai Chen, Lei Wang
Summary: This study demonstrates the formation mechanism of laser-induced periodic surface structures (LIPSS) from a nanohole seed structure to high-spatial-frequency LIPSS using a tightly focused and rectangular-shaped laser beam with different shape-polarization orientations. A quantitative match between modeling and experiment is achieved by forming LIPSS based on light intensity distribution. The results reveal the step-like and deterministic process of LIPSS evolution and the dominant structural near-field enhancement on the ripple formation.
Article
Chemistry, Physical
Jovan Maksimovic, Haoran Mu, Molong Han, Daniel Smith, Tomas Katkus, Vijayakumar Anand, Yoshiaki Nishijima, Soon Hock Ng, Saulius Juodkazis
Summary: Ultra-short 230 fs laser pulses of 515 nm wavelength were focused to 700 nm spots on a Cr etch mask, creating similar to 400 nm nano-holes. The ablation threshold was found to be 2.3 nJ/pulse, and lower energies produced nano-disks while higher energies produced nano-rings. The controlled alloying of Si and Cr on large surface areas with sub-diffraction resolution was achieved using subtle sub-1 nJ pulse energy control.
Article
Polymer Science
Ahmed Al-Qatatsheh, Jaworski C. C. Capricho, Paolo Raiteri, Saulius Juodkazis, Nisa Salim, Nishar Hameed
Summary: The increasing demand for reliable and reproducible protocols in predicting the properties of novel materials, particularly rapidly cured epoxy resins with additives, has emphasized the power of computational modeling and simulation to establish links between intrinsic properties and atomic structure. This study introduces a novel computational modeling and simulation protocol for crosslinking rapidly cured epoxy resin thermosets using solvate ionic liquid (SIL). The protocol combines quantum mechanics (QMs) and molecular dynamics (MDs) approaches to provide a wide range of thermo-mechanical, chemical, and mechano-chemical properties that agree with experimental data.
Article
Materials Science, Multidisciplinary
D. Gonzalez-Hernandez, B. Sanchez-Padilla, D. Gailevicius, S. Chandran Thodika, S. Juodkazis, E. Brasselet, M. Malinauskas
Summary: By studying the effect of laser exposure on materials, adjustable refractive index micro-optical devices can be manufactured with 3D nanolithography. The refractive index of micro-lenses is influenced by material density and morphology, and can be controlled through optimization of exposure. This research opens up possibilities for printing complex 3D shapes with desired refractive properties.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Analytical
Haoran Mu, Daniel Smith, Tomas Katkus, Darius Gailevicius, Mangirdas Malinauskas, Yoshiaki Nishijima, Paul R. Stoddart, Dong Ruan, Meguya Ryu, Junko Morikawa, Taras Vasiliev, Valeri Lozovski, Daniel Moraru, Soon Hock Ng, Saulius Juodkazis
Summary: Microlens arrays (MLAs) were fabricated using a femtosecond direct laser write (fs-DLW) technique, allowing high-fidelity definition of 3D surfaces on IR transparent substrates. A graphene oxide (GO) grating acting as a linear polariser was also fabricated by fs-DLW. The MLAs and GO polarisers were characterised and their performance was simulated through numerical modelling with good agreement between experimental results and simulations.
Article
Chemistry, Analytical
Jovan Maksimovic, Haoran Mu, Daniel Smith, Tomas Katkus, Mantas Vaiciulis, Ramunas Aleksiejunas, Gediminas Seniutinas, Soon Hock Ng, Saulius Juodkazis
Summary: Ultra-short 230 fs laser pulses with a wavelength of 515 nm were used to create 0.4-1 μm holes in alumina Al2O3 etch masks with a thickness of 20-50 nm, simplifying the fabrication of high-efficiency solar cells. The conditions of laser ablation and the effects of sub-surface Si modifications were studied through plasma etching, numerical modeling, and minority carrier lifetime measurements. Mask-less patterning of Si using fs laser direct writing for dry plasma etching of Si was proposed.
Review
Physics, Applied
Hamed Arianfard, Saulius Juodkazis, David J. Moss, Jiayang Wu
Summary: Sagnac interference, as a fundamental optical approach, is widely used for reflection manipulation, precision measurements, and spectral engineering. The integration fabrication techniques have enabled chip-scale Sagnac interferometers, which offer advantages in terms of reduced complexity and high stability. This paper reviews the theory, applications, and challenges of functional integrated photonic devices based on Sagnac interference.
APPLIED PHYSICS REVIEWS
(2023)
Article
Optics
Amudhavel Jayavel, Shivasubramanian Gopinath, Praveen Periyasamy Angamuthu, Francis Gracy Arockiaraj, Andrei Bleahu, Agnes Pristy Ignatius Xavier, Daniel Smith, Molong Han, Ivan Slobozhan, Soon Hock Ng, Tomas Katkus, Aravind Simon John Francis Rajeswary, Rajesh Sharma, Saulius Juodkazis, Vijayakumar Anand
Summary: Pattern recognition techniques are essential for incoherent linear shift-invariant systems. The point spread function (PSF) samples object information in a camera system, which can be used for deblurring the object image. Deep learning-based image classification for computer vision applications has gained attention, and the quality of images plays a crucial role in classification accuracy. In this study, the Lucy-Richardson-Rosen algorithm (LR(2)A) was implemented to deblur images recorded with spatio-spectral aberrations, and it showed superior performance compared to other techniques. The LR(2)A was also applied to improve the image classification performances of deep convolutional neural networks.
Article
Optics
Daniel Smith, Soon Hock Ng, Amanda Tang, Tomas Katkus, Daniel Moraru, Saulius Juodkazis
Summary: Ultra-short laser pulses were used to laser ablate the surface of crystalline sapphire at high intensity. Annealing at high temperature led to surface reconstruction and reduction of surface roughness. The 3D shape of a micro-lens was not altered after annealing.
Article
Engineering, Manufacturing
Edvinas Skliutas, Danielius Samsonas, Arunas Ciburys, Lukas Kontenis, Darius Gailevicius, Jonas Berzins, Donatas Narbutas, Vytautas Jukna, Mikas Vengris, Saulius Juodkazis, Mangirdas Malinauskas
Summary: Multiphoton photopolymerisation (MPP), also known as 3D nanoprinting, was studied using a wavelength-tunable femtosecond laser. The influence of wavelength on the dynamic fabrication window (DFW) and the control over voxel aspect ratio were investigated. The results show that optimizing the wavelength can significantly improve the efficiency of 3D nanoprinting in various applications.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
Article
Quantum Science & Technology
Ahmed Al-Qatatsheh, Saulius Juodkazis, Nishar Hameed
Summary: This article discusses the challenges faced by current semiconductors and superconductors and proposes the development of a new class of organic spintronics. By utilizing materials such as ionic liquids, liquid and soft crystals, and open-shell macroradicals, organic spintronics can provide safer, faster, low-power computing and extended spin-relaxation times.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
