Article
Multidisciplinary Sciences
Cagatay Isil, Deniz Mengu, Yifan Zhao, Anika Tabassum, Jingxi Li, Yi Luo, Mona Jarrahi, Aydogan Ozcan
Summary: In this study, a deep learning-enabled diffractive display is proposed for synthesizing/projecting super-resolved images using low-resolution wavefront modulators. By using an electronic encoder and a diffractive decoder, the system achieves a significant increase in the space-bandwidth product, allowing for high-resolution image projection.
Article
Optics
Lin Zhu, Chun-Ting Xu, Peng Chen, Yi-Heng Zhang, Si-Jia Liu, Quan-Ming Chen, Shi-Jun Ge, Wei Hu, Yan-Qing Lu
Summary: This work proposes an innovative scheme based on opposite-chirality-coexisted superstructures to simultaneously modulate orthogonal circular polarization and achieve PB phase reversal. By refilling cholesteric liquid crystal into a washed-out polymer network with opposite chirality and delicate photo-patterned structures, specific optical phenomena can be efficiently generated.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Xinyu Su, Guolei Liu, Hongyan Yu, Dasai Ban, Niping Deng, Feng Qiu
Summary: This study presents an electro-optic polymer/silicon hybrid metasurface modulator with a high modulation bandwidth, utilizing a specially designed high-Q resonance structure for high-speed and low-energy applications in intelligent tunable metasurfaces and space optical communication.
Article
Optics
Linpei Xue, Yihan Jin, Steve J. Elston, Stephen M. Morris
Summary: This paper investigates the optical phase modulation potential of a nematic liquid crystal (LC) π-cell in the symmetric H (Hs) state. Experimental results of optical phase modulation using a phase-shifting Michelson interferometer are compared with simulation results using the Ericksen-Leslie continuum theory. The stability of the Hs state is studied by adjusting the applied voltage and the voltage burst duration. The LC pi-cell driven into the Hs state using a short burst voltage shows excellent phase modulation capability in achieving full 2n phase modulation with a 1 ms timescale in a reflective geometry.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Xiaomeng Sui, Weijie Wu, Mike Pivnenko, Daping Chu, Liangcai Cao
Summary: In this study, a highly robust dual-SLM complex-amplitude CGH technique is proposed to overcome the non-uniform phase-modulating profiles of LCoS SLMs in holographic display. The technique incorporates a polarimetric mode and a diffractive mode to linearize the phase modulations and optimize the holographic display. Experimental results show significant improvements in reconstructing accuracy using LCoS SLMs with non-uniform phase-modulating profiles.
Review
Quantum Science & Technology
Quan-Ming Chen, Chun-Ting Xu, Xiao Liang, Wei Hu
Summary: This paper reviews the recent progress on the customizable working band of liquid crystal planar optics enabled by helical structures. It summarizes the development of broadband transmissive devices, broadband reflective Bragg-Berry phase elements, transflective phase modulations, and external field shifted bands of planar optics. In addition to customization of the geometric phase and working band, manipulation of other optical parameters is also discussed. The self-assemblies and external field responsiveness of liquid crystals make them a perfect platform for full-dimensional manipulation of light.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Multidisciplinary
Esther Nabadda, Pascuala Garcia-Martinez, Maria del Mar Sanchez-Lopez, Ignacio Moreno
Summary: In this study, we evaluate the reconstruction of complex-valued holograms displayed on a phase-only spatial light modulator (SLM) using phase-shifting interferometry (PSI). The interferometer has no vibration due to its common-path polarization arrangement based on the SLM, which is used for both displaying the hologram and applying phase-shifting values. The continuous phase modulation provided by the SLM allows the use of PSI with arbitrary phase bias values.
FRONTIERS IN PHYSICS
(2022)
Article
Optics
Yihan Jin, Steve J. Elston, Julian A. J. Fells, Bohan Chen, Mengmeng Li, Waqas Kamal, Zimo Zhao, Stephen M. Morris
Summary: The study investigates the time-dependent phase modulation behavior of liquid crystal devices under different electric field conditions. It shows that backflow benefits the phase modulation of the pi-cell, but hinders the dynamic phase response of the Freedericksz cell, in agreement with simulations.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Esther Nabadda, Noureddine Bennis, Michal Czerwinski, Aleksandra Walewska, Leszek R. Jaroszewicz, Maria del Mar Sanchez-Lopez, Ignacio Moreno
Summary: In this work, a ferroelectric liquid crystal (FLC) modulator with a large switching rotation angle close to 90 degrees is fabricated and characterized. The modulator acts as a switchable wave-plate with an in-plane rotation of the principal axis under bipolar voltage. The device behaves as a binary pi phase modulator independently of the input state of polarization in the ideal situation of half-wave retardance. Physico-chemical properties of the liquid crystalline mixture used to fabricate the FLC modulator with such a large switching angle are provided. The device optical properties are characterized, and the polarization-independent pi phase shift is demonstrated using an adapted Young's type interferometer.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Chun-Yu Li, Si-Jia Liu, Bing-Shi Yu, Hai-Jun Wu, Carmelo Rosales-Guzman, Yijie Shen, Peng Chen, Zhi-Han Zhu, Yan-Qing Lu
Summary: Reciprocal spin-orbit coupling with flat optics has the potential to shape and control structured light. Current devices only modulate wavefronts without amplitude control. To address this issue, structured geometric phase gratings are introduced, allowing control of complex amplitudes for orthogonal circular polarizations. This unlocks full-field control of paraxial structured light via flat optics.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Youngkwan Jo, Christian Mai, Stefan Lischke, Lars Zimmermann, Woo-Young Choi
Summary: The modulation linearity of Si ring modulators (RMs) was investigated using numerical simulation and experimental verification based on coupled-mode theory. The numerical values of key parameters were experimentally extracted and the simulation and measurement results showed good agreement. The study characterized the influence of input optical wavelength and power on the Si RM linearity.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Yongmo Lv, Shaoyun Yin, Yi Liu, Zhe Li, Peng Li, Xiuhui Sun, Jianjun Chen, Zheng Yang, Jiahu Yuan
Summary: Geometric phase is an additional phase delay produced by the variation of polarization states when light propagates in an anisotropic medium. In this paper, a reflective phase modulation structure is proposed to achieve geometric phase modulation under the action of IPS liquid crystal cell.
OPTICS COMMUNICATIONS
(2022)
Review
Multidisciplinary Sciences
Shunsuke Kobayashi, Tomohiro Miyama, Hidenari Akiyama, Atsushi Ikemura, Michio Kitamura
Summary: This review article provides a general introduction to the chronological developments of liquid crystals, describes the achievements of defect-free and optically high-quality LCD displays, and discusses new methods for improving existing LCD technologies through nanoparticle doping and optical compensation.
PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES
(2022)
Article
Optics
D. A. P. U. Pi, J. U. A. N. Liu, J. I. E. Wang, Y. U. T. O. N. G. Sun, Y. A. N. Yang, W. E. I. R. U. I. Zhao, Y. O. N. G. T. I. A. N. Wang
Summary: This Letter introduces a computer-generated hologram optimization method based on complex amplitude modulation (CAM) to enhance depth cues. By optimizing the random phase and bandwidth limitation, holographic three-dimensional (3D) display with enhanced depth cues is achieved.
Article
Polymer Science
Mark J. Moran, Olena Ouskova, Katherine M. Gerosa, Anna Tabirian, Nelson Tabiryan, Nicholas P. Godman, Michael E. McConney, Jonathan Slagle, Timothy J. Bunning
Summary: The directed self-assembly of liquid crystal polymers has superior optical properties compared to conventional isotropic optical materials. However, the exploration of reflective liquid crystalline polymeric films has been limited due to production challenges. In this study, we investigate stacked polymer cholesteric liquid crystal thin films as a means to generate reflective diffractive optics for circularly polarized light. We present three different exemplar cases to demonstrate the potential of these unique thin polymer films.
Article
Optics
Martin Vergara, Claudio Iemmi
Summary: This study demonstrates a method for creating multiple independent quasi-perfect vector vortex beams in real time using a phase-only liquid-crystal-on-silicon display. The researchers were able to generate up to seven independent beams with different topological charges, achieving good agreement between simulated and measured phases and polarization structures. In addition, the same scheme was used to enhance the depth of focus of a single beam, resulting in a tube beam that maintains its properties during propagation.
Article
Multidisciplinary Sciences
Carla Rodriguez, Albert Van Eeckhout, Enrique Garcia-Caurel, Angel Lizana, Juan Campos
Summary: Imaging polarimetry methods have been proven effective in enhancing image contrast between tissues and structures in organic samples, and revealing structures hidden in regular intensity images. However, previous pseudo-colored images based on polarimetry were suboptimal. In this study, two new pseudo-colored methods based on Euclidean distances and likelihood for each pixel were proposed and experimentally validated on four different biological samples, demonstrating their potential in biomedical and botanical applications.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
Carla Rodriguez, Enrique Garcia-Caurel, Teresa Garnatje, Mireia Serra i Ribas, Jordi Luque, Juan Campos, Angel Lizana
Summary: This paper highlights the potential of using polarimetric methods for the inspection of plant diseased tissues and shows the accuracy of depolarizing observables in discriminating between healthy and diseased plant tissues. By studying different plant specimens with various disease symptoms and infection stages, the depolarizing information of vegetal tissues is demonstrated to enhance the image contrast between healthy and diseased tissues.
SCIENTIFIC REPORTS
(2022)
Article
Biochemical Research Methods
Carla Rodriguez, Irene Estevez, Emilio Gonzalez-Arnay, Juan Campos, Angel Lizana
Summary: Polarimetric data is used to build recognition models for organic tissues or early disease detection. Different polarimetric observables are proposed in literature, obtained through mathematical transformations of the Mueller matrix. In this study, 12 classification models based on different polarimetric datasets are compared, highlighting the importance of using raw Mueller matrix elements for classification models design.
JOURNAL OF BIOPHOTONICS
(2023)
Article
Optics
Esther Nabadda, Maria Del Mar Sanchez-Lopez, Pascuala Garcia-Martinez, Ignacio Moreno
Summary: A technique using a liquid-crystal spatial light modulator (LC-SLM) is utilized to quantitatively evaluate the intensity and phase of diffraction orders generated by tailored phase gratings. The setup is converted into a polarization common-path interferometer by rotating a polarizer, allowing a phase-shifting interferometry algorithm to retrieve the phase of the diffraction orders. The advantage and simplicity of the technique are demonstrated by experimentally testing various tailored designs with controlled phase shifts between diffraction orders.
Article
Materials Science, Multidisciplinary
B. Al Bugami, Y. Su, C. Rodriguez, A. Lizana, J. Campos, M. Durfort, R. Ossikovski, E. Garcia-Caurel
Summary: In this study, vine leaves (Vitis vinifera) were investigated using imaging polarimetry at a wavelength of 530 nm. The aim was to demonstrate the potential of polarimetry and polarimetric microscopy for characterizing vegetal tissues, using vine leaves as a case study. The analysis of the Mueller matrix image of the sample revealed observables directly related to the sample's physical properties. Birefringence and dichroism were found to be useful markers for identifying specific structures in the sample, while polarimetric images enhanced contrast and allowed the visualization of previously invisible structures.
Article
Optics
Monica Canabal-Carbia, Albert Van Eeckhout, Carla Rodriguez, Emilio Gonzalez-Arnay, Irene Estevez, Jose J. Gil, Enrique Garcia-Caurel, Razvigor Ossikovski, Juan Campos, Angel Lizana
Summary: Polarimetry is an optical technique widely used in various fields, including biomedical research. It has been found that the polarimetric properties of biological samples, such as retardance, dichroism, and depolarization, can be measured to provide valuable information. This study focuses on investigating different depolarization metrics for biomedical applications and proposes the use of indices of polarimetric purity (IPPs) for biological tissue inspection. Results show that IPPs outperform the commonly used depolarization index, enhancing contrast between tissue structures and revealing hidden structures. Additionally, IPPs and other depolarizing observables demonstrate potential for accurate classification of different tissues.
JOURNAL OF INNOVATIVE OPTICAL HEALTH SCIENCES
(2023)
Article
Optics
Quimey Pears Stefano, Martin Vergara, Claudio Iemmi
Summary: In this paper, a real-time phase-shifting interferometry method is presented. The method utilizes a parallel aligned liquid crystal on a silicon display as a customized reference mirror. By programming macropixels into the display and dividing them into four zones with appropriate phase shifts, the phase of the wavefront can be obtained at a rate limited only by the integration time of the detector. The customized mirror compensates for the initial curvature of the object and introduces the necessary phase shifts for phase calculation. Examples of phase reconstruction for static and dynamic objects are demonstrated.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2023)
Article
Optics
Daniel Puerto, Sergi Gallego, Catalin Constantinescu, Camilo Florian, Manuel Ortuno, Andres Marquez, Jorge Frances, Inmaculada Pascual, Augusto Belendez, Patricia Alloncle
Summary: A tunable photopolymer (photopolymer dispersed liquid crystal-PDLC) was successfully printed using the laser-induced direct transfer technique without an absorber layer, which had been a challenge due to the low absorption and high viscosity of PDLC. The LIFT printing process was made faster and cleaner, resulting in high-quality printed droplets with aspheric profiles and low roughness. The use of a femtosecond laser and a narrow energy window was necessary for the polymer ejection without spattering.
Article
Optics
Pascuala Garcia-Martinez, Ignacio Moreno
Summary: This study presents a new optical system for polarization image processing using geometric-phase lenses. These lenses are half-wave plates with a quadratic relationship between the orientation of the fast axis and the radial coordinate. They split an input collimated beam into a converging beam and a diverging beam with opposite circular polarizations. This coaxial polarization selectivity introduces a new degree of freedom in optical processing systems, which is useful for imaging and filtering applications that require polarization sensitivity.
Article
Physics, Applied
Q. Pears Stefano, A. G. Magnoni, J. Estrada, C. Iemmi, D. Rodrigues, J. Tiffenberg
Summary: We have developed an imaging device in the infrared wavelength range that can arbitrarily reduce readout noise. The device has photon-number-resolving capability, high spatial resolution, high quantum efficiency in the near-infrared, and ultralow dark counts. By reducing the readout noise to less than 0.2e-, we are able to image objects in a broad range of intensities and reveal shapes previously hidden in the noise.
PHYSICAL REVIEW APPLIED
(2023)
Article
Remote Sensing
Dong Yao, Hangang Liang, Juan Campos, Lei Yan, Chunhui Yan, Chunming Jiang, Songnian Tan, Chao Liang, Hanyu Wang, Lingtong Meng, Yanping Cheng
Summary: This study proposes a new polarization super-resolution (PSR) remote sensor and a data recovery method to address the spatial resolution loss and information errors in division-of-focalplane (DoFP) polarization remote sensing systems. The experimental results demonstrate that the system can eliminate the spatial resolution loss caused by the DoFP technology and double the real image resolution in both the horizontal and vertical directions.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2023)
Proceedings Paper
Materials Science, Characterization & Testing
Carla Rodriguez, Albert Van Eeckhout, Irene Estevez, Laia Ferrer, Enrique Garcia-Caurel, Emilio Gonzalez-Arnay, Juan Campos, Angel Lizana
Summary: In recent years, there has been an increasing attention on the application of polarimetric methods for biological tissues inspection. This study proposes four predictive models for the recognition of four ex-vivo chicken tissue categories. By analyzing the polarization characteristics, the models achieve stable and accurate results for the recognition of bone, tendon, muscle, and myotendinous junction tissues.
POLARIZED LIGHT AND OPTICAL ANGULAR MOMENTUM FOR BIOMEDICAL DIAGNOSTICS 2022
(2022)
