Results 91 to 100 of about 1,237,711 (248)

Advanced biological imaging techniques based on metasurfaces

Opto-Electronic Advances
Advanced imaging techniques have been widely used in various biological studies. Currently, numerous imaging modalities are utilized in biological applications, including medical imaging, diagnosis, biometrics, and fundamental biological research ...
Yongjae Jo, Hyemi Park, Hyeyoung Yoon, Inki Kim   +3 more
doaj   +1 more source

Fiber Ring Laser Directional Torsion Sensor with Ultra-Wide Linear Response

Sensors, 2019
In this paper, a comprehensive passive torsion measurement is performed firstly in a 40-cm-long polarization maintaining fiber-based Sagnac interferometer (PMF-SI), and the non-linear torsion response is found and investigated.
Xianjin Liu, Fengjuan Wang, Jiuru Yang, Xudong Zhang, Xiliang Du   +4 more
doaj   +1 more source

Characterization and Compensation of the Residual Chirp in a Mach-Zehnder-Type Electro-Optical Intensity Modulator

, 2010
We utilize various techniques to characterize the residual phase modulation of a fiber-based Mach-Zehnder electro-optical intensity modulator. A heterodyne technique is used to directly measure the phase change due to a given change in intensity, thereby
Auracher, Bakos, Bakos, C. E. Rogers III, Courjal, Devaux, Dorrer, J. A. Pechkis, J. L. Carini, Kawanishi, Kowalski, Koyama, Krause, Laverdiére, Miao, Nagatsuka, Oikawa, P. L. Gould, Park, Ricci, Rogers, Romstad, Saunders, Schiess, Thomsen, Wright, Yan, Yan   +27 more
core   +1 more source

Precision Construction of Chiral Optical Fields with Nine Controllable Degrees of Freedom

Advanced Photonics Research
Recently, chiral optical fields (COFs) have garnered significant attention due to their multiple controllable degrees of freedom (DOFs), enabling applications in diverse areas such as optical tweezers, manufacturing, and holographic encryption.
Duo Deng, Xing Liu, Zixin Xu, Zhenjun Yang, Yan Li   +4 more
doaj   +1 more source

Influence of Initial Phase Modulation on the Sensitivity of the Optical Fiber Sagnac Acoustic Emission Sensor

Applied Sciences, 2019
Improving the phase sensitivity of the optical fiber Sagnac sensor is very important for accurately detecting weak signals of acoustic emission. Theoretical analysis shows that the initial phase of the sensor is π under ideal conditions, and the ...
Zhuming Cheng, Jie Zeng, Dakai Liang, Chen Chang, Bing Wang   +4 more
doaj   +1 more source

On linear structure and phase rotation invariant properties of block 2(sup l)-PSK modulation codes [PDF]

Two important structural properties of block 2(l)-ary PSK (phase shift keying) modulation codes, linear structure and phase symmetry, are investigated.
Lin, Shu
core   +1 more source

Theory of Polar Blue Phases

, 2014
In liquid crystals, if flexoelectric couplings between polar order and director gradients are strong enough, the uniform nematic phase can become unstable to formation of a modulated polar phase.
Allender, David W., Selinger, Jonathan V., Shamid, Shaikh M.   +2 more
core   +1 more source

Phase retrieval by coherent modulation imaging

Nature Communications, 2016
AbstractPhase retrieval is a long-standing problem in imaging when only the intensity of the wavefield can be recorded. Coherent diffraction imaging is a lensless technique that uses iterative algorithms to recover amplitude and phase contrast images from diffraction intensity data. For general samples, phase retrieval from a single-diffraction pattern
Bo Chen, Bo Chen, Joan Vila-Comamala, Manuel Guizar-Sicairos, Graeme R. Morrison, Fucai Zhang, Ian K. Robinson, Ian K. Robinson   +7 more
openaire   +5 more sources

Multi-mode single sideband time modulation harmonic adaptive beamforming

Zhongguo Jianchuan Yanjiu
ObjectiveThis study proposes an innovative beamforming method to achieve high-efficiency harmonic adaptive beamforming through multi-mode single sideband time modulation technology.MethodA multi-mode single sideband time modulation module containing ...
Tao YANG, Xiaonan ZHAO, Zhenji LIU, Tingting FAN, Liu YANG, Yu XIA, Jingfeng CHEN   +6 more
doaj   +1 more source

Digital decoder for phase-delay coded data [PDF]

, 1971
Coded or modulated digital data converts to nonreturn to zero /NRZ/ data. Technique includes logic implementation and pertinent timing diagrams. Demodulation to NRZ facilitates digital logic operations on incoming data.
Lewin, J.
core   +1 more source