27 papers · ranked by Valyu relevance
Authors not listed
The wave description of geometric phase uses the superposition of light waves to explain the geometric phase's origin. While our previous work focused on a basis of linearly polarized waves, here we show that the same concepts can be applied to circularly polarized waves, and to any case in which a rotator is itself…
Soyeon Seo, Jinho Lee, Yongho Lee, Hyunchol Shin + 1 more
A 28 GHz digitally controlled 6-bit phase shifter with a precision calibration technique in GaN high-electron mobility transistor (HEMT) technology is presented for Ka-band phased-array systems and applications. It comprises six stages, in which stages 1 and 2 for 5.625° and 11.25° are designed in the form of a…
Asaf Paris-Mandoki, Eduardo Esquivel Ramírez, Leonardo Uhthoff-Rodríguez, Edgar Giovanni Alonso-Torres + 2 more
'Leonardo Uhthoff-Rodríguez' 'Edgar Giovanni Alonso-Torres' 'Alberto Hernández-López' 'Carlos Gardea-Flores'] A fundamental parameter to determine how electromagnetic waves interfere is their relative phase, and achieving a fine control over it enables a wide range of interferometric applications. Existing phase…
Mohamed A. Bitar, Antonette Lynn Gallo, F. Volpe
A multi-pole, multi-zero design allowed realizing a "true" phase-shifter (not time-delayer) of flat frequencyresponse over more than 3 decades (30Hz-100kHz), which can be extended to higher frequencies or broader bands thanks to a modular design. Frequency-dependent optimization of a single resistance made also the…
Igor Shevkunov, Nikolay V. Petrov, Vijayakumar Anand, Boaz Jessie Jackin + 1 more
In this paper, we detail a phase-shift implementation in a rotated plane-parallel plate (PPP). Considering the phase-shifting digital holography application, we provide a more precise phase-shift estimation based on PPP thickness, rotation, and mutual inclination of reference and object wavefronts. We show that phase…
Tianhao Chu, Zilong Ji, Junfeng Zuo, Yuanyuan Mi + 5 more
Hippocampal place cells of freely moving animals display ‘theta phase precession’, whereby spikes are fired at successively earlier phases of the 6-10 Hz local field potential (LFP) theta rhythm. In some cases, this phase precession is interleaved with periods of ‘phase procession’, in which spikes are fired at…
Daniel X. Du, Anthony W. P. Fitzpatrick
Ponderomotive phase plates have shown temporally consistent phase contrast is possible within electron microscopes via high fluence static laser modes resonating in Fabry-Perot cavities. Here, we explore using pulsed laser beams as an alternative method of generating high fluences. We find through forward-stepping…
Alexander Schultze, Dennis Weise, Alexander Sell, Claus Braxmaier
The delay of photodetectors can be affected by intensity, reverse bias, and temperature through different effects. An optical pilot tone superimposed on the detectors allows the independent measurement of such phase errors in the complete photodetection chain and provides an opportunity to correct them. This allows…
Yanbin Chen, Tong Wang, Qi Liu, Haochen Wang + 2 more
'Guangcai Sun'] An orientation controllable radar cross section (RCS) enhancement surface is presented in this paper, which can be used to improve the road pile detectability of on-board microwave radar for autonomous driving system. In addition, the RCS enhancement orientation can be controlled in a specified…
Rao Farhat Masood
In this paper, introduced below are the concepts of digital modulation used in many communication systems today. Techniques described include quadrature phase shift keying (QPSK) and quadrature amplitude modulation (QAM) and how these techniques can be used to increase the capacity and speed of a wireless network.…
Zhou Fang, Sanne ten Oever, Alexander Sack, Inge Leunissen
Phase-dependent modulation of motor inhibition suggests that oscillatory timing plays a key role in inhibitory control. Here we show that rhythmic brain stimulation can selectively alter this timing in a manner consistent with phase precession. Participants performed an anticipatory stop-signal task while receiving 20…
Bharath Ananthasubramaniam, Christoph Schmal, Hanspeter Herzel
Mathematical models of varying complexity have helped shed light on different aspects of circadian clock function. In this work, we question whether minimal clock models (Goodwin models) are sufficient to reproduce essential phenotypes of the clock: a small phase response curve (PRC), fast jetlag and seasonal phase…
Simon Rerucha, Zdenek Buchta, Martin Sarbort, Josef Lazar + 1 more
'Ondrej Cip'] We have proposed an approach to the interference phase extraction in the homodyne laser interferometry. The method employs a series of computational steps to reconstruct the signals for quadrature detection from an interference signal from a non-polarising interferometer sampled by a simple photodetector.…
suraj Manikandan, Jens Andreasen
This preprint has been retracted at the authors' request because of recently discovered fundamental errors and misrepresentation in the underlying data.This communication introduces a Ka-band phase shifter that leverages a blend of the donor polymer PM6 and non-fullerene acceptor (NFA) Y7 organic materials. The design…
Qiang Jiang, Jiabi Chen, Yan Wang, Binming Liang + 2 more
'Songlin Zhuang'] Although the inverse Doppler effect has been observed experimentally at optical frequencies in photonic crystal with negative effective refractive index, its explanation is based on phenomenological theory rather than a strict theory. Elucidating the physical mechanism underlying the inverse Doppler…
Carmelo Rosales‐Guzmán, Nathaniel Hermosa, Aniceto Belmonte, Juan P. Torres
'Juan P. Torres'] The use of structured light beams to detect the velocity of targets moving perpendicularly to the beam's propagation axis opens new avenues for remote sensing of moving objects. However, determining the direction of motion is still a challenge since detection is usually done by means of an…
Authors not listed
This report compares various simulation and data analysis methods for free induction decay (FID) signals in Nuclear Magnetic Resonance (NMR) Spectroscopy. The methods discussed include discrete fast Fourier transformation (FFT), least squares fitting (LSF), short-time Fourier transformation (STFT), and wavelet…
Ó. Alejos, J. M. Muñoz
This paper aims to shed some more light on one of the best known phenomena in the field of physics, the Doppler effect, in particular, on its classical version. Although, as mentioned, it is a phenomenon already described more than 150 years ago, the general case, even considering constant velocities, continues to be…
Yuan Ren, Song Qiu, Tong Liu, Zhengliang Liu
The simultaneous and independent measurement of multiple movement forms is a significant issue to be solved in research. In this paper, we proposed a method that combines the self-interference of conjugated optical vortices and external interference of plane waves, and successfully realize the independent measurement…
Heng Wu, Tong Gou, Damon A. Clark
Illusions expose core computations in perception. In one visual apparent-motion illusion, perceptual direction is reversed when phase-shifted gratings are interleaved with uniform frames. Here, we demonstrate that Drosophila exhibits the same direction reversal reported in mammals. Combining behavior, targeted…
Authors not listed
Phase change materials (PCMs) with distinct optical properties at different phases are promising candidates for programmable photonics, optical communication and photonic computing. In this work, we have studied thermo-optic effect in a PCM-based integrated photonic device comprising a film of bistable [Fe2Co2]…
Sara Giarrusso, Paola Gori-Giorgi, Federica Agostini
We generalize the definitions of local scalar potentials named vkin and vN−1, which are relevant to properly describe phenomena such as molecular dissociation with density-functional theory, to the case in which the electronic wavefunction corresponds to a complex current-carrying state. In such a case, an extra term…
Daniel W. Davies, Sang Kyu Park, Stephen B. Shiring, Hyunjoong Chung + 7 more
Cooperativity is used by living systems to circumvent energetic and entropic barriers to yield highly efficient molecular processes. Cooperative structural transitions involve the simultaneous, concerted displacement of molecules in a crystalline material, in stark contrast to the more typical molecule-by-molecule…
D Rubenstein
Compass mapping of moving rotors during atrial fibrillation unveiled unique properties of a different form of Doppler phenomenon. New rotational (RDE) and spiral Doppler effect (SDE) equations are derived and explain the diverging frequency changes (increasing and decreasing) that occur simultaneously on either side of…
Authors not listed
This article is the second in a two-part tutorial review on electronic spin-dependent dynamics. In Part I, we presented the fundamental theory within the adiabatic Born– Huang framework that describes the interaction between nuclear motion and the elec- tronic (spin and spatial) degrees of freedom. In particular, we…
Xavier Michalet
The time-resolved analysis of periodically excited luminescence decays by the phasor method in the presence of time-gating or binning is revisited. Analytical expressions for discrete configurations of square gates are derived, and the locus of the phasors of such modified periodic single-exponential decays is compared…
Yoshio Nishimoto
Complete active space second-order perturbation theory (CASPT2) is useful for accurately predicting properties of complex electronic structures, but it is well known that it systematically underestimates excitation energies. The underestimation can be corrected using the ionization potential--electron affinity (IPEA)…