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Articles de revues sur le sujet « Modulation angulaire »

Auteur : Grafiati

Publié le 8 juin 2024

Mis à jour le 31 juillet 2025

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1

Bertho, A., M. Dos Santos, A. François, and F. Milliat. "Histoire de la prise en charge des cancers bronchopulmonaires non à petites cellules de stade précoce : de la chirurgie à la radiothérapie stéréotaxique." Radioprotection 55, no. 3 (2020): 165–72. http://dx.doi.org/10.1051/radiopro/2020050.

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Avant le début du XXe siècle, le cancer bronchopulmonaire était une maladie rare. Aujourd’hui, c’est le quatrième cancer le plus fréquent en France et concerne, chaque année, près de 50 000 patients. Si à travers l’histoire, la pierre angulaire de la prise en charge thérapeutique du cancer bronchopulmonaire reste la chirurgie, la radiothérapie en est un des piliers, notamment chez les patients à haut risque chirurgical. La radiothérapie est apparue quelques mois après la découverte des rayons X en 1896 et, rapidement, des protocoles standardisés ont été mis au point par les premiers radiobiolo

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Wang, Huan, Jiajun Linghu, Xuezhi Wang, Qiyi Zhao, and Hao Shen. "Angular-Dependent THz Modulator with Hybrid Metal-Graphene Metastructures." Nanomaterials 13, no. 13 (2023): 1914. http://dx.doi.org/10.3390/nano13131914.

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The coupling effects of surface plasmon resonance (SPR) from metamaterials induce variation in both the frequency and intensity of plasmonic modes. Here, we report an angular-dependent THz modulator with hybrid metal–graphene metastructures. The metastructures composed of the period gold split-rod arrays on top of a monolayer graphene, which show redshift modulation in the THz region with an increasing incident angle due to the strong out-of-plane magnetic flux introduced by the clockwise circular current at the oblique incidence. By utilizing graphene-based actively tunable conductor with ion

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Wang, Jian, Jun Liu, Shuhui Li, Yifan Zhao, Jing Du, and Long Zhu. "Orbital angular momentum and beyond in free-space optical communications." Nanophotonics 11, no. 4 (2021): 645–80. http://dx.doi.org/10.1515/nanoph-2021-0527.

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Abstract Orbital angular momentum (OAM), which describes tailoring the spatial physical dimension of light waves into a helical phase structure, has given rise to many applications in optical manipulation, microscopy, imaging, metrology, sensing, quantum science, and optical communications. Light beams carrying OAM feature two distinct characteristics, i.e., inherent orthogonality and unbounded states in principle, which are suitable for capacity scaling of optical communications. In this paper, we give an overview of OAM and beyond in free-space optical communications. The fundamentals of OAM

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Liu, Peijun, Yanan Fu, Xi Xie, Changjun Min, Yuquan Zhang, and Xiaocong Yuan. "High-efficiency monolayer metallic metasurface for modulation of orbital angular momentum." Chinese Optics Letters 20, no. 12 (2022): 123601. http://dx.doi.org/10.3788/col202220.123601.

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Huang Xianming, 黄先明, 王飞 Wang Fei, 陆宝乐 Lu Baole та 白晋涛 Bai Jintao. "基于轨道角动量交换实现巨克尔非线性效应调控". Acta Optica Sinica 42, № 22 (2022): 2219002. http://dx.doi.org/10.3788/aos202242.2219002.

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Xiao, Min, Axiu Cao, Cheng Xu, Hui Pang, Yongqi Fu, and Qiling Deng. "Design and Fabrication of Continuous Surface Optical Field Modulator for Angular Spectrum Discreteness Compensation." Micromachines 15, no. 8 (2024): 952. http://dx.doi.org/10.3390/mi15080952.

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The light homogenizing element is a crucial component of the illumination system of the lithography machine. Its primary purpose is to realize the uniform distribution of energy. However, it suffers from a common issue, which is angular spectrum discreteness, which significantly impacts light uniformity. To address this, we design and fabricate random micro-cylindrical lens arrays to obtain a small-angle Gaussian optical field, which can compensate for the angular spectrum discreteness. By adjusting the pitches and curvature radii of the micro-cylindrical lenses separately, we are able to mani

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Horunlu, Kardelen, and Yasin Çelik. "PERFORMANCE ANALYSIS OF ADAPTIVE MIMO TECHNIQUES FOR ANGULAR DIVERSITY RECEIVER-BASED VISIBLE LIGHT COMMUNICATION." Journal of Naval Sciences and Engineering 20, no. 2 (2024): 163–89. https://doi.org/10.56850/jnse.1496134.

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Correlation between the channels is the primary factor that restricts data rates in multiple-input multiple-output visible light communications (MIMO-VLC). Different receiver designs have been proposed to reduce this correlation value, while adaptive modulations that perform better under the correlated channel effect have been studied on the transmitter side. In this study, we conducted a performance analysis of MIMO-VLC systems by utilizing adaptive MIMO modulations at the transmitter side and angular diversity receiver (ADR) structures at the receiver side. As adaptive modulations, created u

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Liu, Jun, Shuang Zheng, Shi Chen, et al. "High-speed spatial light modulation based on photon dimension mapping assisted by an integrated mode multiplexer." Applied Physics Letters 120, no. 13 (2022): 131103. http://dx.doi.org/10.1063/5.0076652.

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Photon dimension mapping provides an efficient way to learn from each other's strengths to offset their own weaknesses in a variety of applications. By mapping the conventional amplitude modulation to spatial mode modulation and employing an integrated orbital angular momentum (OAM) mode multiplexer, we present an integrated approach to break the spatial light modulation speed limit and implement the high-speed silicon-chip-assisted OAM encoding information transfer. The silicon chip is formed by a multi-mode micro-ring resonator with angular grating embedded in the inner wall and two bus wave

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Buzzelli, A., P. de Bernardis, S. Masi, N. Vittorio, and G. de Gasperis. "Optimal strategy for polarization modulation in the LSPE-SWIPE experiment." Astronomy & Astrophysics 609 (January 2018): A52. http://dx.doi.org/10.1051/0004-6361/201730754.

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Context. Cosmic microwave background (CMB) B-mode experiments are required to control systematic effects with an unprecedented level of accuracy. Polarization modulation by a half wave plate (HWP) is a powerful technique able to mitigate a large number of the instrumental systematics. Aims. Our goal is to optimize the polarization modulation strategy of the upcoming LSPE-SWIPE balloon-borne experiment, devoted to the accurate measurement of CMB polarization at large angular scales. Methods. We departed from the nominal LSPE-SWIPE modulation strategy (HWP stepped every 60 s with a telescope sca

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Belousov, Igor, Veniamin Samoseiko, and Alecsandr Saushev. "Assessment of filtering properties of asynchronous electric drive with pulse width modulation." E3S Web of Conferences 363 (2022): 01025. http://dx.doi.org/10.1051/e3sconf/202236301025.

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The process of pulse-width modulation in the converter-motor system is considered. It is noted that the main task of pulse width modulation of voltage formed by the electronic key converter in the converter-motor system is to reduce current pulsations during the modulation period. It is established, that the dynamic process of current change in the electric machine during the period of pulse-width modulation can be approximated by R, L filter. It is shown, that the most important task of pulse-width modulation is minimization of modulation error by current in electric motor. The analysis of po

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Zhang, Chenming, Jie Li, Xiaoqiao Yuan, et al. "Optimal Rotational Angular Velocity Determination Method Based on Compound Rotary Semi-Strapdown Inertial Navigation System." Sensors 22, no. 12 (2022): 4583. http://dx.doi.org/10.3390/s22124583.

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Single-axis rotation modulation (SRM) still accumulates errors in the roll axis direction, which leads to the navigation accuracy not meeting the requirements of guided missiles. Compound rotation modulation (CRM) superimposes one-dimensional rotation on the basis of SRM, so that the error of the projectile in the direction of the roll axis is also modulated. However, the error suppression effect of CRM is not only affected by the error of the IMU itself, but also related to the modulation angular velocity. In order to improve the accuracy of rotary semi-strapdown inertial navigation system (R

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Kushiro, Keisuke, Mingjia Dai, Mikhail Kunin, Sergei B. Yakushin, Bernard Cohen, and Theodore Raphan. "Compensatory and Orienting Eye Movements Induced By Off-Vertical Axis Rotation (OVAR) in Monkeys." Journal of Neurophysiology 88, no. 5 (2002): 2445–62. http://dx.doi.org/10.1152/jn.00197.222.

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Nystagmus induced by off-vertical axis rotation (OVAR) about a head yaw axis is composed of a yaw bias velocity and modulations in eye position and velocity as the head changes orientation relative to gravity. The bias velocity is dependent on the tilt of the rotational axis relative to gravity and angular head velocity. For axis tilts <15°, bias velocities increased monotonically with increases in the magnitude of the projected gravity vector onto the horizontal plane of the head. For tilts of 15–90°, bias velocity was independent of tilt angle, increasing linearly as a function of head ve

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Van Leeuwen, Moira, Sjoerd Bruijn, and Jaap Van Dieën. "Mechanisms that stabilize human walking." Brazilian Journal of Motor Behavior 16, no. 5 (2022): 326–51. http://dx.doi.org/10.20338/bjmb.v16i5.321.

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   In this paper we review what mechanisms are used to stabilize human bipedal gait. Based on mechanical reasoning, potential mechanisms to control the body center of mass trajectory are modulation of foot placement, stance leg control consisting of modulation of ankle moments and push-off forces, and modulations of the body’s angular momentum. The first two mechanisms and especially the first are dominant in controlling center of mass accelerations during gait, while angular momentum control plays a lesser role, but may be important to control body alignment and orientation.

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Liu, Houquan, Yaran Guo, Mantong Zhao, Jingfu Ye, Ronghui Xu, and Libo Yuan. "Azimuthally Spliced Power-Exponential Phase Modulation for Focal Spot Shaping of Circular Airy Beams." Photonics 12, no. 2 (2025): 135. https://doi.org/10.3390/photonics12020135.

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Circular airy beam (CAB) is a kind of new structured light with non-diffracting, self-focusing, and self-healing properties. Due to its wide applications, recently, numerous researchers have used various methods to modulate this kind of beam. We theoretically verify and experimentally demonstrate the azimuthal modulation method to shapes the focal spot of the CAB by modulating the CAB with the azimuthally spliced power-exponential phase. The results show that after modulating by an azimuthally spliced power-exponential phase, multi-focal spots can be generated on the self-focusing focal plane

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Maneiro-Catoira, Roberto, Julio Brégains, José A. García-Naya, and Luis Castedo. "Dual-Beam Steerable TMAs Combining AM and PM Switched Time-Modulation." Sensors 22, no. 4 (2022): 1399. http://dx.doi.org/10.3390/s22041399.

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Wireless sensor networks (WSN) are increasingly requiring directional antennas that not only provide higher capacity, security, transmission range or robustness against interference, but also contribute with smart antenna capabilities such as adaptive beamforming or multi beam radiation patterns. Standard phased arrays provide these features, but employing feeding networks based on digitally controlled variable phase shifters (VPSs) which have the disadvantage of high cost and limited angular resolution. Instead, time-modulated arrays (TMAs) use switched feeding networks governed by digital pe

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Kolesnyk, Vadym, and Mykola Chernyak. "Autonomous Instrumental Error Correction for a Strapdown Inertial Navigation System." MECHANICS OF GYROSCOPIC SYSTEMS, no. 45 (May 15, 2023): 85–97. http://dx.doi.org/10.20535/0203-3771452023293127.

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Microelectromechanical systems (MEMS)-based strapdown navigation systems offer advantages such as small size, low cost, and minimal power consumption. However, MEMS sensors are prone to significant low-frequency noise and poor bias repeatability, which can lead to navigational errors over time. These errors make them unsuitable for autonomous navigation applications, even with frequent recalibration. One way to solve this problem is the rotation modulation method. This approach is widely recognized but has only been successful with precise laser and fiber optic gyroscopes equipped with precise

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Liu, Weihang, Chao Feng, Yi Jiao, and Sheng Wang. "A coherent harmonic generation method for producing femtosecond coherent radiation in a laser plasma accelerator based light source." Journal of Synchrotron Radiation 28, no. 3 (2021): 669–80. http://dx.doi.org/10.1107/s1600577521002745.

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The electron beam generated in laser plasma accelerators (LPAs) has two main initial weaknesses – a large beam divergence (up to a few milliradians) and a few percent level energy spread. They reduce the beam brightness and worsen the coherence of the LPA-based light source. To achieve fully coherent radiation, several methods have been proposed for generating strong microbunching on LPA beams. In these methods, a seed laser is used to induce an angular modulation into the electron beam, and the angular modulation is converted into a strong density modulation through a beamline with nonzero lo

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Zhang, Jiayu, Jie Li, Xiaorui Che, et al. "The Optimal Design of Modulation Angular Rate for MEMS-Based Rotary Semi-SINS." Micromachines 10, no. 2 (2019): 111. http://dx.doi.org/10.3390/mi10020111.

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In previous studies, the semi-strapdown inertial navigation system (SSINS), based on microelectromechanical system (MEMS) sensors, had realized cross-range measurement of attitude information of high-spinning projectiles through construction of a “spin reduction” platform of the roll axis. However, further improvement of its measurement accuracy has been difficult, due to the inertial sensor error. In order to enhance the navigational accuracy, a periodically rotating method is utilized to compensate for sensor error, which is called rotation modulation. At present, the rotation scheme, as one

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Jing, Zhengyao, Jie Li, Xi Zhang, Kaiqiang Feng, and Tao Zheng. "A Novel Rotation Scheme for MEMS IMU Error Mitigation Based on a Missile-Borne Rotation Semi-Strapdown Inertial Navigation System." Sensors 19, no. 7 (2019): 1683. http://dx.doi.org/10.3390/s19071683.

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In previous research, a semi-strapdown inertial navigation system (SSINS), based on micro-electro-mechanical system (MEMS) sensors, was able to realize over-range measurement of the attitude information of high-rotation missiles by constructing a single axis “spin reduction” platform. However, the MEMS sensors in SSINS were corrupted by significant sensor errors. In order to further improve SSINS measurement accuracy, a rotational modulation technique has been introduced to compensate for sensor errors. The ideal modulation angular velocity is changed sharply to achieve a constant speed, while

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ZHANG, Chao, and Lu MA. "Trellis Coded Orbital Angular Momentum Modulation." IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E99.A, no. 8 (2016): 1618–21. http://dx.doi.org/10.1587/transfun.e99.a.1618.

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Basar, Ertugrul. "Orbital Angular Momentum With Index Modulation." IEEE Transactions on Wireless Communications 17, no. 3 (2018): 2029–37. http://dx.doi.org/10.1109/twc.2017.2787992.

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Liu Haida, 刘海达, 黑小兵 Hei Xiaobing, 杨洋 Yang Yang та ін. "用于水下光通信高维调制与解调的轨道角动量叠加态". Laser & Optoelectronics Progress 60, № 9 (2023): 0901001. http://dx.doi.org/10.3788/lop220952.

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Wu, Fuping, Yuanfei Hui, Zhiwei Cui, and Ju Wang. "Reflection Characteristics of Airy Beams Impinging on Graphene-Substrate Surfaces." International Journal of Optics 2022 (January 3, 2022): 1–10. http://dx.doi.org/10.1155/2022/5319174.

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In this work, we analytically and numerically investigate the reflection characteristics of the airy beams impinging on graphene-substrate surfaces. The explicit analytical expressions for the electric and magnetic field components of the airy beams reflected from a graphene-substrate interface are derived. The local-field amplitude, Poynting vector, and spin and orbital angular momentum of the reflected airy beams with different graphene structure and beam parameters are presented and discussed. The results show that the reflection properties of the airy beams can be flexibly tuned by modulat

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Khosravi, Shahram, Amirabbas Ghazizadeh, and Shant Baghram. "21-cm power spectrum and ionization bias as a probe of long-mode modulated non-Gaussian sky." Monthly Notices of the Royal Astronomical Society 488, no. 4 (2019): 5941–51. http://dx.doi.org/10.1093/mnras/stz2037.

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ABSTRACT The observed hemispherical power asymmetry in cosmic microwave background radiation can be explained by long-wavelength mode (long-mode) modulation. In this paper, we study the possibility of detecting this effect in the angular power spectrum of the 21-cm brightness temperature. For this task, we study the effect of the neutral hydrogen distribution on the angular power spectrum. This is done by formulating the bias parameter of the ionized fraction to the underlying matter distribution. We also discuss the possibility that the long-mode modulation is accompanied by a primordial non-

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Жиленко, Д. Ю., та О. Э. Кривоносова. "Синхронизация в турбулентном сферическом течении Куэтта под действием неравномерного вращения". Журнал технической физики 89, № 7 (2019): 992. http://dx.doi.org/10.21883/jtf.2019.07.47786.391-18.

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Turbulent flows of viscous incompressible fluid in rotating spherical layer in the presence of synchronization are under consideration. Numerical results are presented. Synchronization of turbulent flow is due to the action of periodical modulation of the angular velocity of inner spherical boundary. The angular velocity of outer spherical boundary is constant. Obtained results were compared with experimental data. The interval of modulation amplitudes was determined where synchronization is followed by intermittency “chaos – chaos”.

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Hadar, O., A. Dogariu, and G. D. Boreman. "Angular dependence of sampling modulation transfer function." Applied Optics 36, no. 28 (1997): 7210. http://dx.doi.org/10.1364/ao.36.007210.

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Sherstukov, S. A., A. N. Buravtsova, D. S. Tolstykh, and S. S. Pechnikov. "Operation algorithms and application of functional converters modulating voltage for generation of precision radio signals with angular modulation." IOP Conference Series: Materials Science and Engineering 919 (September 26, 2020): 052008. http://dx.doi.org/10.1088/1757-899x/919/5/052008.

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Li, Zhaohui, and Wenying Xue. "Measuring the orbital angular momentum mode of vortex beam based on phase matching sequence." Journal of Physics: Conference Series 2209, no. 1 (2022): 012006. http://dx.doi.org/10.1088/1742-6596/2209/1/012006.

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Abstract Measuring the orbital angular momentum(OAM) mode of vortex beams is of great significance in applications based on vortex beams.we propose a method of phase matching characteristics of vortex beams to measure the OAM mode. The method first use a high-speed spatial light modulator(SLM) to sequentially load a set of helical phase sequence images, so that the vortex beam is modulated by this SLM. Then obtain the modulated optical field through pinhole filtering, and then the synchronized tilt phase modulation is performed by the 4f system and high-speed SLM. When the OAM mode of vortex b

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Miranda, Martin, Nobuyuki Takei, Yuki Miyazawa, and Mikio Kozuma. "Multi-Harmonic Modulation in a Fiber-Optic Gyroscope." Sensors 23, no. 9 (2023): 4442. http://dx.doi.org/10.3390/s23094442.

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Optimizing the bias modulation of a fiber-optic gyroscope is crucial to improving its precision. In this study, we propose and demonstrate the use of multiple harmonics of sinusoidal modulation as an intermediate alternative to the widely used modulation methods: sinusoidal and square-wave modulation. We show that this alternative integrates the advantages of each modulation method by providing a smooth modulation that produces a clean, spike-free output and a satisfactory signal-to-noise ratio. By using three harmonics of modulation in combination with a high frequency to reduce thermal phase

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Kadry, Haysam M., Mohammad Alhawari, and Dimitrios L. Sounas. "Angular-Momentum Biased Circulator With Locally Generated Modulation." IEEE Transactions on Microwave Theory and Techniques 69, no. 1 (2021): 551–65. http://dx.doi.org/10.1109/tmtt.2020.3034322.

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Ren, Zhijun, Jinping He, and Yile Shi. "Generation of Mathieu beams using angular pupil modulation." Chinese Physics B 27, no. 12 (2018): 124201. http://dx.doi.org/10.1088/1674-1056/27/12/124201.

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Tardini, G., J. Ferreira, P. Mantica, et al. "Angular momentum studies with NBI modulation in JET." Nuclear Fusion 49, no. 8 (2009): 085010. http://dx.doi.org/10.1088/0029-5515/49/8/085010.

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Bespalov, E. S. "Models for a sinusoidal angular modulation index meter." Measurement Techniques 49, no. 3 (2006): 233–37. http://dx.doi.org/10.1007/s11018-006-0096-6.

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Beams, Ryan, Matthew Johnson, Chumin Zhao, and Amitabh Varshney. "P‐49: Angular Dependent Point Spread Function Analysis for Virtual Reality Head Mounted Displays." SID Symposium Digest of Technical Papers 55, no. 1 (2024): 1551–54. http://dx.doi.org/10.1002/sdtp.17853.

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We demonstrate a point spread function method for measuring the angular dependence of the spatial resolution of a virtual reality head mounted display. The angular dependence of spatial resolution of the imaging detector was characterized to remove the detector's contribution at each angular location measured on the VR HMD. This method allows measuring the twodimensional spatial resolution and modulation transfer function.

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Papadakis, Antonios E., and John Damilakis. "Evaluation of an organ-based tube current modulation tool in pediatric CT examinations." European Radiology 30, no. 10 (2020): 5728–37. http://dx.doi.org/10.1007/s00330-020-06888-5.

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Abstract Objectives To investigate the effect of an organ-based tube current modulation (OTCM) technique on organ absorbed dose and assess image quality in pediatric CT examinations. Methods Four physical anthropomorphic phantoms that represent the average individual as neonate, 1-year-old, 5-year-old, and 10-year-old were used. Standard head and thorax acquisitions were performed with automatic tube current modulation (ATCM) and ATCM+OTCM. Dose calculations were performed by means of Monte Carlo simulations. Radiation dose was measured for superficial and centrally located radiosensitive orga

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Bai, Xudong, Fuli Zhang, Li Sun, et al. "Dynamic millimeter-wave OAM beam generation through programmable metasurface." Nanophotonics 11, no. 7 (2022): 1389–99. http://dx.doi.org/10.1515/nanoph-2021-0790.

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Abstract Millimeter-wave (mmWave) and orbital angular momentum (OAM) multiplexing are two key technologies for modern wireless communications, where significant efforts have been devoted to combining these two technologies for extremely high channel capacities. Recently, programmable metasurfaces have been extensively studied for stimulating dynamic multi-mode OAM beams, owing to their ability of subtle dynamic modulation over electromagnetic waves in a digital manner. However, programmable metasurfaces for mmWave OAM stimulation are rarely mentioned, due to the requirement of extremely high p

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Shi, Chengzhi, Marc Dubois, Yuan Wang, and Xiang Zhang. "High-speed acoustic communication by multiplexing orbital angular momentum." Proceedings of the National Academy of Sciences 114, no. 28 (2017): 7250–53. http://dx.doi.org/10.1073/pnas.1704450114.

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Long-range acoustic communication is crucial to underwater applications such as collection of scientific data from benthic stations, ocean geology, and remote control of off-shore industrial activities. However, the transmission rate of acoustic communication is always limited by the narrow-frequency bandwidth of the acoustic waves because of the large attenuation for high-frequency sound in water. Here, we demonstrate a high-throughput communication approach using the orbital angular momentum (OAM) of acoustic vortex beams with one order enhancement of the data transmission rate at a single f

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Kim, Eunhee, Sunghwan Sohn, Hyunwook Moon, Jun Hyeok Choi, and Kiwon Lee. "Linear Frequency Modulation and Orthogonal Code Modulation for Co-Located Multiple-Input Multiple-Output High-Frequency Surface Wave Radar." Remote Sensing 16, no. 1 (2023): 104. http://dx.doi.org/10.3390/rs16010104.

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A high-frequency surface wave radar (HFSWR) is the only sensor that provides inexpensive surveillance for up to 200 nautical miles (NM) of the exclusive economic zone in the 3–5 MHz band. However, because of its long wavelength, its angular resolution is low. Multiple-input multiple-output (MIMO) technology is an attractive method to improve angular resolution. This paper proposes MIMO waveforms and their processing that can be used in HFSWR systems. This dual modulation method applies linear frequency modulation to each pulse and orthogonal polyphase codes for a few consecutive pulses to enab

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Viktorov, D. S., and E. V. Plastinina. "The mathematical description of the functional transformations of a signal with angular modulation in sequentially the connected quantizers of a phase and tension." Spacecrafts & Technologies 2, no. 1 (2018): 38–46. http://dx.doi.org/10.26732/2618-7957-2018-1-38-46.

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The most important constituent of the modern terrestrial stations of satellite communication are digital synthesizers of signals. With their help various composite signals indicators. The interest of developers in use in the created and perspective terrestrial stations of satellite communication of digital synthesizers of signals is caused by a number of the objective reasons: – digital synthesizers of signals, in comparison with analog, have high stability of parameters of the formed signals and low level of phase noise; – the combination of broad functionality to high speed of switching and

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Liu, Tuo, and Tongyang Shi. "Loss-induced multiple modal coalescences in an acoustic ring cavity." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 8 (2023): 444–49. http://dx.doi.org/10.3397/in_2023_0077.

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Chiral exceptional points refer to a class of non-Hermitian degeneracies where two counter-propagating whispering-gallery-like eigenmodes coalesce into one travelling eigenmode, which have been utilized to create orbital angular momentum in various wave systems. However, most studies in this field have so far focused on the modal coalescence for a specific azimuthal order. In this work, we investigate the eigenmodes evolution of an acoustic ring cavity under complex spatial modulation of refractive index along the azimuthal direction. We show that a careful engineering of the complex modulatio

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Qin, Xiujuan, Xinzhu Sang, Hui Li, et al. "High Resolution Multiview Holographic Display Based on the Holographic Optical Element." Micromachines 14, no. 1 (2023): 147. http://dx.doi.org/10.3390/mi14010147.

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Limited by the low space-bandwidth product of the spatial light modulator (SLM), it is difficult to realize multiview holographic three-dimensional (3D) display. To conquer the problem, a method based on the holographic optical element (HOE), which is regarded as a controlled light element, is proposed in the study. The SLM is employed to upload the synthetic phase-only hologram generated by the angular spectrum diffraction theory. Digital grating is introduced in the generation process of the hologram to achieve the splicing of the reconstructions and adjust the position of the reconstruction

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Filion-Côté, Sandrine, Feriel Melaine, Andrew G. Kirk, and Maryam Tabrizian. "Monitoring of bacterial film formation and its breakdown with an angular-based surface plasmon resonance biosensor." Analyst 142, no. 13 (2017): 2386–94. http://dx.doi.org/10.1039/c7an00068e.

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Istamgulova, Julia R., Sergey V. Gagarskiy, Sergey G. Grechin, Petr Y. Druzhinin, Vladimir A. Rusov, and Andrey N. Sergeev. "Investigation of the capabilities of an electro-optic modulator based on a temperature-noncritical KTP crystal." Laser Physics 34, no. 11 (2024): 115401. http://dx.doi.org/10.1088/1555-6611/ad8220.

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Abstract The results of theoretical and experimental investigations on angular selectivity and features of a temperature-noncritical electro-optic modulator based on the potassium titanyl phosphate crystal are presented. The influence of angular selectivity and the walk-off effect on the electro-optic modulator contrast and the inhomogeneity of the transverse distribution of modulator transmittance are investigated. The contrast value was measured for both half-wave and compensated quarter-wave schemes.

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Vahidinia, Vahideh, Mahmoud Atashbar, and Shahram Hosseinzadeh. "Orbital angular momentum and mode multiplexing based index modulation." Physical Communication 48 (October 2021): 101407. http://dx.doi.org/10.1016/j.phycom.2021.101407.

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Lee, Hyuk. "Polarization-independent acoustooptic light modulation with large angular aperture." Applied Optics 27, no. 5 (1988): 815. http://dx.doi.org/10.1364/ao.27.000815.

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Hyuk Lee. "Acoustooptic Light Modulation with Large Bandwidth and Angular Aperture." IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 34, no. 4 (1987): 485–86. http://dx.doi.org/10.1109/t-uffc.1987.26971.

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Liu, Zhi, Baolin Huang, and Wei Lin. "Acoustic Metasurfaces for Efficient Modulation and Demodulation of OAM Multiplexed Signals in Acoustic Communication." Journal of Physics: Conference Series 2822, no. 1 (2024): 012144. http://dx.doi.org/10.1088/1742-6596/2822/1/012144.

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Abstract Orbital angular momentum (OAM) multiplexing has been suggested as a potential solution to increase the data capacity of acoustic communication systems. A method of modulation and demodulation of OAM multiplexed signals using acoustic metasurfaces is proposed in this manuscript. The amplitude and phase of independent acoustic orbital angular momentum (AOAM) multiplexed signal provide orthogonal degrees of freedom. By designing appropriate acoustic metasurfaces and combining them with binary differential phase coding techniques, we demonstrated that efficient modulation and fast demodul

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Bian, Zichao, Soliman Alhudaithy, Zhe Wang, et al. "Angular light modulator using optical blinds." Optics Express 24, no. 25 (2016): 28467. http://dx.doi.org/10.1364/oe.24.028467.

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Rogers, Brian, Suzanne Martin, and Izabela Naydenova. "Study of the Effect of Methyldiethanolamine Initiator on the Recording Properties of Acrylamide Based Photopolymer." Polymers 12, no. 4 (2020): 734. http://dx.doi.org/10.3390/polym12040734.

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The use of Holographic Optical Elements (HOEs) in applications, such as in light shaping and redirection, requires certain characteristics such as a high Diffraction Efficiency, low angular selectivity and stability against UV damage. In order to maximize the performance of the HOEs, photosensitive materials are needed that have been optimised for the characteristics that are of particular importance in that application. At the core of the performance of these devices is the refractive index modulation created during holographic recording. Typically, a higher refractive index modulation will e

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Keny, Swapnil M. "Trends in Guided Growth for Correction of Angular Deformities around the Knee: Past, Present, and Future." Journal of Clinical Orthopaedics 8, no. 2 (2023): 57–61. http://dx.doi.org/10.13107/jcorth.2023.v08i02.600.

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The principles of guided growth have been followed in orthopaedics since historic times . The bent tree braced to a stake to make it grow upward and straight is the first reference to the principles of growth modulation in the annals of orthopaedic history Keywords: Guided Growth, Epiphysiodesis, Hemiepiphysiodesis, growth modulation, eight plates, genu varum, genu valgum, deformity correction, pediatric orthopaedics, growth plate

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