Article
Chemistry, Multidisciplinary
Matthew Eliceiri, Costas P. Grigoropoulos
Summary: In this study, we have improved the maximum two-dimensional translation rate of optically tweezed silicon nanowires using a silicon film substrate and a specific laser wavelength. We have also reduced the power usage significantly. The mechanism for the enhanced tweezing effect was explained using finite difference time domain simulation, and the robust and deterministic placement of the nanowires on the film surface was demonstrated experimentally.
Article
Nanoscience & Nanotechnology
Ramin Jamali, Farzaneh Nazari, Azadeh Ghaffari, Sabareesh K. P. Velu, Ali-Reza Moradi
Summary: The study explores the use of speckle tweezers (ST) to manipulate low index micro-particles by repelling them from high intensity regions to lower intensity regions for local confinement. The experiments validate the method and show that ST can also manipulate nanoparticle (NP)-loaded liposomes, enabling collective manipulation of drug micro-containers.
Article
Chemistry, Multidisciplinary
Elham Babaei, Demelza Wright, Reuven Gordon
Summary: By combining fringe-field dielectrophoresis with nano aperture optical tweezers, single molecule analysis of proteins in an aqueous environment without modification is achieved. The trapping time for proteins is significantly faster when the counter electrode is positioned outside of the solution compared to the more common configuration inside the solution. These findings are a major advancement for the nanoaperture optical trapping technique for high-throughput protein analysis.
Article
Physics, Applied
Domna G. Kotsifaki, Viet Giang Truong, Sile Nic Chormaic
Summary: This work demonstrates the sequential trapping of 20nm particles using metamaterial plasmonic optical tweezers, with the investigation of multiple trapping via trap stiffness measurements for various trapping configurations. The plasmonic configuration could be utilized as a light-driven nanoscale sorting device, offering an alternative method to trap multiple nanoparticles at distinct hotspots and control mass transport on the nanoscale.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Di Huang, Pengcheng Wan, Ling Zhou, Haiqin Guo, Ruihuang Zhao, Jun Chen, Jack Ng, Junjie Du
Summary: The working mechanism of single-beam optical tweezers is thoroughly examined using a newly established method. The conservative and nonconservative components of optical force are calculated for different optical regimes, and the concept of an "optical trapping core" is proposed to better illustrate the stability of the trapping process.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Shuoshuo Zhang, Yuquan Zhang, Yanan Fu, Zheng Zhu, Zhongsheng Man, Jing Bu, Hui Fang, Changjun Min, Xiaocong Yuan
Summary: Single molecule detection and analysis are essential in current biomedical research, and deep-nanoscale hotspots in a plasmonic nanocavity can enhance nonlinear light-matter interactions and molecular Raman scattering. Modulation of optical trapping force and Raman signal at the single molecule level is achieved through nonlinear responses of metallic tip and substrate film. This platform has great potential in various research fields requiring high-precision surface imaging.
Article
Multidisciplinary Sciences
Zhaoxi Li, Danfeng Wang, Chunlong Fei, Zhihai Qiu, Chenxue Hou, Runcong Wu, Di Li, Qidong Zhang, Dongdong Chen, Zeyu Chen, Wei Feng, Yintang Yang
Summary: This study reports the selective trapping of microspheres using a single acoustical beam via acoustic force. The forbidden band theory of acoustic radiation force trapping suggests that the trapping of particles is directly related to the particle diameter-to-beam wavelength ratio and excitation frequency. By adjusting the wavelength of the acoustic beam, it is possible to selectively manipulate microspheres of varying sizes.
Article
Optics
Cong Chen, Wanling Wang, Zilong Liu, Xiang Zeng, Kaiwei Wang, Bo Zhang
Summary: We demonstrate the non-contact trapping of a yeast cell using an optical fiber probe with a micron-size concave cavity, both theoretically and experimentally. The optical fiber tip with a micron-size concave cavity is fabricated using an improved tube etching method. The output fields and optical forces on a yeast cell are analyzed, and the experimental results confirm the successful non-contact trapping. The use of these micron-size concave fiber tips has versatile applications in bio-science and medical research.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Hao Wu, Chunlei Jiang, Shaopeng Tian, Shangzhao Shao, Hangyu Yue, Xiangyu Cui, Bingkun Gao, Xiufang Wang, Peng Chen
Summary: This paper presents a multifunctional single-fiber optical tweezer for particle trapping and transport. By modifying the structure of the fiber probe and using laser sources with different wavelengths and modes, non-contact trapping and long-distance transport of particles can be achieved.
CHINESE OPTICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Kairon M. Oliveira, Tiago A. Moura, Janaisa L. C. Lucas, Alvaro V. N. C. Teixeira, Marcio S. Rocha, Joaquim B. S. Mendes
Summary: This paper proposes the use of PANI as handles in optical tweezers experiments. The stable trapping and manipulation of PANI beads using optical tweezers are demonstrated for the first time. The results suggest the potential of using semiconductor polymeric materials in optical manipulation and open up new possibilities for related applications.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Optics
Jingjing Hong, Xingping Zhou, Rui Zhuang, Wei Peng, Jiawei Liu, Aiping Liu, Qin Wang
Summary: A stable and manipulatable nanoparticle trapping method called Counter-Surface Plasmon Polariton Lens (CSPPL) is proposed in this paper. By adjusting the incident angle and phase difference, the optical potential depth and center position on CSPPL can be accurately controlled. This study promotes the development of integrated optical tweezers.
CHINESE OPTICS LETTERS
(2022)
Article
Optics
Zheng Zhu, Yuquan Zhang, Shuoshuo Zhang, Aurele J. L. Adam, Changjun Min, Hendrik Paul Urbach, Xiaocong Yuan
Summary: This study demonstrates, both theoretically and experimentally, the nonlinear optical tweezing within the RSA regime at ultrahigh intensities through an optical force reversal induced by nonlinear absorption. These findings provide guidance for improving nonlinear optical trapping systems and have beneficial implications for wider applications of nonlinear optics.
ADVANCED PHOTONICS
(2023)
Article
Optics
Jatin Abacousnac, David G. Grier
Summary: This paper introduces a dark trap created by superimposing Gaussian modes with different waist diameters, which is used to manipulate light-seeking and dark-seeking particles in the same system. The interference-based difference-of-Gaussians (DoG) trap can rigidly capture dark-seeking particles in three dimensions.
Article
Chemistry, Multidisciplinary
Cheng-Yu Li, Bei Zheng, Jiang-Tao Li, Jia-Ling Gao, Yu-Heng Liu, Dai-Wen Pang, Hong-Wu Tang
Summary: The CRISPR/Cas12a system offers an alternative opportunity for designing fluorescence biosensors with outstanding precision in target recognition. By utilizing collateral cleavage and representative transduction pathways, the system can extend sensing coverage and improve assay sensitivity. The developed biosensors not only exhibit ultrasensitive behavior towards non-nucleic acid analytes but also show practical application capacity in real samples.
Article
Nanoscience & Nanotechnology
Yasuyuki Tsuboi, Shota Naka, Daiki Yamanishi, Tatsuya Nagai, Ken-ichi Yuyama, Tatsuya Shoji, Bunsho Ohtani, Mamoru Tamura, Takuya Iida, Tatsuya Kameyama, Tsukasa Torimoto
Summary: The research focuses on optical trapping of inorganic nanocrystals at oil/water interfaces under a loose focus condition. The study successfully trapped octahedral gold nanoparticles, rice-shaped ZnS-AgInS2 nanoparticles, and octahedral titania nanoparticles at the oil/water interface. The experiment also observed the formation of a hybrid particle at the interface and the spontaneous breakdown of rotational symmetry in the optically coupled nanoparticles.
ACS APPLIED NANO MATERIALS
(2021)
Article
Optics
Esteban Vera, Felipe Guzman, Camilo Weinberger
Summary: This paper proposes several methods to reduce the training and estimation time of deep learning wavefront sensors, including the development of a quickly trainable CNN, exploring the effects of using images of different sizes, and estimating different amounts of Zernike modes. The results show that the proposed network can significantly reduce training time, improve estimation accuracy, and speed up prediction time.
Article
Optics
Miguel Marquez, Pablo Meza, Fernando Rojas, Henry Arguello, Esteban Vera
Summary: Compressive Spectral Depth Imaging (CSDI) is a new technology that reconstructs spectral and depth information from a limited set of 2D projections. This study presents a snapshot CSDI architecture that utilizes phase and amplitude modulation and a single image sensor, demonstrating an efficient computational imaging system to capture spectral-depth hypercubes.
Article
Multidisciplinary Sciences
J. Tapia, N. Vera, Joao Aguilar, M. Gonzalez, S. A. Sanchez, P. Coelho, C. Saavedra, J. Staforelli
Summary: Using dual time resolved membrane fluctuation spectroscopy, it was found that human red blood cell membrane fluctuation is dependent on d-glucose concentration, with mechanical parameters changing accordingly. Under different d-glucose concentrations, an increase in the fluctuation amplitude of the lipid bilayer was observed, along with a decrease in tension value, bending modulus, and fluidity.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Esteban Vera, Felipe Guzman, Nelson Diaz
Summary: This paper proposes a modification to the rolling shutter mechanism found in CMOS detectors by shuffling the pixels in every scanline. This hardware modification improves the sampling of the space-time datacube, enabling the recovery of high-speed videos from a single image using tensor completion methods or reconstruction algorithms. A design methodology for optimal sampling schemes is also presented and compared to random shuffling. Simulations and experimental results demonstrate the effectiveness of the shuffled rolling shutter in capturing images that allow for video reconstruction.
Article
Optics
Dianqiang Su, Pablo Solano, Jeffrey D. Wack, Luis A. Orozco, Yanting Zhao
Summary: We demonstrate optomechanical cooling of a tapered optical nanofiber by coupling light polarization to the mechanical angular momentum, utilizing birefringence in the fiber without the need for an optical resonator. Evidence for cooling is observed in the distribution of thermally driven amplitude fluctuations and torsional mode noise spectrum. Our proof-of-principle demonstration showcases cavity-less cooling of the torsional degree of freedom in a macroscopically extended nanofiber.
PHOTONICS RESEARCH
(2022)
Editorial Material
Optics
Gustavo S. Wiederhecker, S. B. Cavalcanti, Adriana Fontes, Jorge Garcia-Sucerquia, Dario Perez, Esteban Vera, Andrea Bragas, Christiano De Matos, Alejandro Fainstein, Daniel Felinto, Debora M. B. P. Milori, Stephen P. Walborn
Summary: Over the past 50 years, South American optics research has made remarkable growth and significant contributions in areas such as quantum optics, holography, spectroscopy, nonlinear optics, statistical optics, nanophotonics, and integrated photonics. This research has driven economic development in sectors like telecom, biophotonics, biometrics, and agri-sensing. The joint feature issue between JOSA A and JOSA B showcases cutting-edge optics research from the region, fostering a sense of community and promoting collaboration among researchers.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2023)
Article
Physics, Multidisciplinary
S. Cardenas-Lopez, P. Solano, L. A. Orozco, A. Asenjo-Garcia
Summary: When a broadband signal propagates through a dispersive medium, precursors can appear due to the movement of certain frequency components faster than the pulse center. The microscopic origin of precursors was investigated using an array of qubits coupled to a waveguide. Even with just two qubits, the dispersion produced is enough to generate oscillatory transients. Precursors are most observable under conditions of electromagnetically induced transparency, and can be generated with just a single qutrit. These findings pave the way for light dispersion engineering with a few qubits and can be realized using superconducting qubits coupled to transmission lines or atoms coupled to optical waveguides.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
M. Uria, A. Maldonado-Trapp, C. Hermann-Avigliano, P. Solano
Summary: Nonlinear light-matter interactions reveal the quantum nature of coherent states by exhibiting negative values in their Wigner function while maintaining their Poissonian photon statistics. These states have nonminimum uncertainty and can achieve the Heisenberg limit, providing a metrological advantage. Non-Gaussianity of light arises from general properties of nonlinear interactions using a polarizable media, whether resonant or dispersive. Our results highlight the importance of extracting useful quantum features from seemingly classical states of light, which is relevant for quantum optics applications.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Computer Science, Artificial Intelligence
Nelson Diaz, Alejandro Alvarado, Pablo Meza, Felipe Guzman, Esteban Vera
Summary: This paper proposes a novel mathematical framework to design Multispectral Filter Arrays (MSFAs) using a Sphere Packing (SP) approach. The proposed method improves image quality and spectral similarity, and reduces false colors and zipper effect artifacts. Experimental results show superior performance compared to state-of-the-art MSFAs in terms of spatial and spectral fidelity.
IEEE TRANSACTIONS ON IMAGE PROCESSING
(2023)
Article
Optics
P. Solano, P. Barberis-Blostein, K. Sinha
Summary: In this study, we investigate a system consisting of two distant quantum emitters coupled via a one-dimensional waveguide. We find that the electromagnetic field in the waveguide has a direction-dependent velocity, leading to nonsimultaneous onset of collective emission. Under certain parameters, radiation can be enhanced for one emitter while inhibited for the other. Interference effects allow the system to exhibit directional emission depending on the atomic state and field propagation phases. We characterize the directional emission as a function of various parameters and identify the conditions for optimal directionality.
Article
Environmental Sciences
Alberto Lencina, Gustavo Romagnoli, Andrea Alonso, Noelia Ramos, Cristian D'Angelo, Lina Lett, Silvia Mestelan
Summary: This study utilized Laser-Induced Breakdown Spectroscopy to analyze 30 feedlot compost samples at different stability and maturity stages, determining the total P concentration through wet digestion and colorimetry with random calibrations. Results show that water content must be taken into consideration due to logistic implications, and calibrations with around 30% prediction error were achieved, providing a practical approximation for predicting total P content in compost for nutrient recycling on farms.
INTERNATIONAL JOURNAL OF RECYCLING OF ORGANIC WASTE IN AGRICULTURE
(2022)
Proceedings Paper
Astronomy & Astrophysics
Jorge Tapia, Felipe Pedreros Bustos, Camilo Weinberger, Bastian Romero, Esteban Vera
Summary: The School of Electrical Engineering at the Pontificia Universidad Catolica de Valparaiso in Chile has built an adaptive optics test bench featuring a flexible design and state-of-the-art equipment for research in adaptive optics and wavefront reconstruction.
ADAPTIVE OPTICS SYSTEMS VIII
(2022)
Proceedings Paper
Astronomy & Astrophysics
Camilo Weinberger, Felipe Guzman, Jorge Tapia, Benoit Neichel, Esteban Vera
Summary: The use of deep neural networks improves estimation performance of PyWFS and extends its operational range, particularly advantageous in dealing with low seeing ratios.
ADAPTIVE OPTICS SYSTEMS VIII
(2022)
Article
Optics
A. Olivera, K. Sinha, P. Solano
Summary: The resonant dipole-dipole interaction between two atoms can be enhanced by an aplanatic lens, opening new avenues for studying macroscopic dipole-dipole interactions.
Proceedings Paper
Engineering, Multidisciplinary
David Escobar, Esteban Vera
Summary: This paper compares two wavefront sensing applications using various CNN Deep Learning architectures to obtain the closest representation of them in terms of Zernike Coefficients. The proposed network SH-P Net for the Shack Hartmann and Pyramid sensor fits with lower RMSE than the others. The database generated with uniform distribution allows the neural network to learn better and faster.
2021 IEEE CHILEAN CONFERENCE ON ELECTRICAL, ELECTRONICS ENGINEERING, INFORMATION AND COMMUNICATION TECHNOLOGIES (IEEE CHILECON 2021)
(2021)
Article
Optics
Hang Dong, Zhixin Sun, Jingyi Li, Yahui Li, Wei Zhang, Guangyong Jin
Summary: This paper calculates thermal stresses and adsorption forces to determine laser cleaning conditions and establishes relevant models. Experimental results show that the removal effect is better with increasing nanosecond pulse delay, with the best effect achieved at 600 milliseconds pulse delay. Based on the findings, the mechanisms of oxide film removal involve thermal stress against adsorption and plasma shock wave breaking the oxide layer.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Junjie Zhang, Wenjun Li, Bingtao Li, Zheng-Da Hu, Jicheng Wang, Feng Zhang, Lei Wang
Summary: A multilayer thin film device structure based on Tamm plasmons is proposed for high-performance near-infrared hot electron photodetectors. By optimizing the device structure parameters, high responsivity detection can be achieved.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hong Huang, Zhiguang Han
Summary: This paper proposes a new ghost imaging reconstruction method using ordered orthogonal Hadamard derived speckle as the illumination speckle series, and introduces the alternating direction multiplier method to improve the imaging performance. The evaluation results show that the method can achieve high-quality reconstructed images under low sampling conditions.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Moritsugu Sakamoto, Yuki Ono, Kohei Noda, Tomoyuki Sasaki, Nobuhiro Kawatsuki, Masayuki Tanaka, Hiroshi Ono
Summary: The effect of wavelength and polarization of illuminating light in polarization imaging for birefringent objects placed behind a scattering structure was experimentally investigated. The result shows that the spatial distribution of the birefringent object was more clearly visualized in the longer wavelength combined with circularly polarized light illumination. This finding indicates the potential of using polarization imaging with circularly polarized light illumination in the near-infrared range for visualizing birefringent objects with scattering.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Peihui Du, Hongfang Wang, Pengwei Li, Rukeyemuhan Abadula, Hmbat Batelbek, Min Gao
Summary: In this study, we theoretically demonstrate the strong coupling between Tamm plasmons and exciton polaritons in metal Al/DBR-molecular structures, extending the operating wavelength to the deep ultraviolet region. The coupling strength can be effectively manipulated by adjusting the structure parameters, offering potential benefits for the development of new-style optical filters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Priyanka Chaudhary, Akhilesh Kumar Mishra
Summary: We design and numerically investigate the switching dynamics between two outer waveguides in a parity-time (PT)-symmetric adiabatically coupled three waveguides nonlinear directional coupler (NLDC) system. The study shows that the device can provide switching even when the middle waveguide is nonlinear and the outer waveguides are linear. Furthermore, the effect of loss to gain ratio on critical switching power and the impact of launched light power and gain (loss) value on transmitted power are also studied.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Wei Feng, Yongcong Yi, Shuyang Li, Zhi Xiong, Boya Xie, Zhen Zeng
Summary: Traditional imaging techniques are ineffective in achieving clear underwater imaging due to the presence of scattering media. Single-pixel imaging (SPI) system based on Unet++ offers a solution for reconstructing high-quality images in highly turbid water environments.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiaorui Qu, Jufeng Zhao, Haijun Tian, Junjie Zhu, Guangmang Cui
Summary: This paper studies the structural similarity between RGB and spectral images and proposes a non-iterative Images Structure Similarity (ISS) method for fast reconstruction of spectral images. Additionally, the input of the Deep Image Prior (DIP) method is optimized for the first time by using the initial spectral data reconstructed by ISS, leading to an improved starting value for the iteration. The experimental results show that the proposed method can enhance the reconstruction quality in both spectral and spatial resolutions, while significantly reducing the reconstruction time compared to other DIP-based methods.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Donghe Sheng, Zhe Han, Zanyang Qiao, Tianpei Dong, Chenxi Wang, Huiping Tian
Summary: In this study, a distributed multi-parameter sensor based on an etched few-mode multi-core fiber is proposed, allowing simultaneous sensing of temperature, strain, and sample refractive index. By combining space division multiplexing and stimulated Brillouin scattering, the sensor achieves high sensitivity in detecting these parameters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Dehao Chen, Zhenwu Mo, Zehong Liang, Junjie Jiang, Huilin Tang, Yidan Sun, Ziyu Wang, Quanfeng Wei, Yanru Chen, Dongmei Deng
Summary: In this study, a novel family of elliptical Airyprime vortex beams (EAPVBs) is introduced, which inherits the excellent self-focusing properties of the circular Airyprime vortex beam (CAPVB). The asymmetric focusing of EAPVB leads to some novel properties, such as the splitting of high-order optical vortex and the formation of two foci. By taking advantage of these properties, EAPVB is constructed as a tunable optical bottle for particle capture.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiao Ma, Qiongchan Shao, Jian-Jun He
Summary: In this study, an SHS chip based on Su8 waveguide was designed and fabricated. By physically adjusting the metal electrodes and compensating for transmissivity fluctuations, the generation of side ripples was successfully suppressed.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hongbin Zhang, Jiansen Du, Zongtao Chi, Hailin Cong, Bin Wang
Summary: In this paper, a novel type of dual-wavelength confocal metalens is proposed to solve the spatial crosstalk between two wavelengths. The metalens can greatly reduce the spatial crosstalk and achieve high precision and efficiency in confocal imaging. It can also focus light in specific wavelength ranges, making it suitable for imaging, microscopy, and optical fiber communication.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Rui Qiu, Guanmao Zhang, Shaokai Du, Jie Liu, Hongyu Jib, Kaiyun Bi, Bochuan Xing, Guangchao Diao
Summary: Recent research has developed an achromatic metalens that shows potential for replacing traditional lenses. This study focuses on a continuously variable focus height broadband achromatic metalens for long-wavelength infrared applications. By optimizing materials and parameters, chromatic aberration is effectively corrected, making it suitable for high-resolution LWIR imaging and spectroscopy systems.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Marcos Troncoso-Costas, Gaurav Jain, Yiming Li, Mohammed Patel, Lakshmi Narayanan Venkatasubramani, Sean O'Duill, Frank Smyth, Andrew Ellis, Francisco Diaz-Otero, Colm Browning, Liam Barry
Summary: In this work, a fast-switching tuneable laser capable of wide wavelength coverage, low noise and linewidth levels suitable for high-order modulation formats is demonstrated. The laser is characterized to cover a wavelength range of 35 nm in the C-band with nanosecond switching time. It is used to successfully demonstrate 480 Gbit/s 16QAM transmission over 25 km of single-mode fiber for a wavelength range of 19 nm.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Takeshi Moriyasu, Masahiko Tani, Hideaki Kitahara, Takashi Furuya, Jessica Afalla, Toshiro Kohmoto, Daishiro Koide, Hiroki Sato, Mitsutaka Kumakura
Summary: Optical pump-terahertz probe spectroscopy was used to study the photocarrier dynamics and optical characteristics of semiconductor Si. The results showed that the thickness of Si influenced the transmitted terahertz field amplitude and peak delay time, indicating differences in photocarrier dynamics between different Si materials.
OPTICS COMMUNICATIONS
(2024)
