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The development of effective focusing schemes for positron bunches in plasma accelerators remains a significant challenge, as nonlinear regimes fail to create stable focusing channels for positrons. This work presents a method for focusing…

Plasma Physics · Physics 2025-09-04 D. S. Bondar , C. A. Lindstrøm , V. I. Maslov , I. N. Onishchenko

This paper reports the observation of ultra-superluminal pulse propagation in GaAs/AlGaAs multiple contact heterostuctures in a superradiant emission regime, and shows definitively that it is a different class of emission from conventional…

Strongly Correlated Electrons · Physics 2015-08-25 Peter P. Vasil'ev , Richard V. Penty , Ian H. White

Graded index microstructured polymer optical fiber incorporating a specially designed air-hole array featuring variable air-hole diameters and inter-hole separation is proposed, fabricated and characterized in view of the fiber potential…

Optics · Physics 2014-09-24 Tian Ma , Andrey Markov , Lili Wang , Maksim Skorobogatiy

We study propagation and switching of slow-light pulses in nonlinear couplers with phase-shifted Bragg gratings. We demonstrate that power-controlled nonlinear self-action of light can be used to compensate dispersion-induced broadening of…

Optics · Physics 2009-04-01 Sangwoo Ha , Andrey A. Sukhorukov , Yuri S. Kivshar

We propose dynamical Bragg mirrors as a means to compress intense short optical pulses. We show that strong-field photoexcitation of carriers changes the refractive index of the layers and leads to motion of the resonance-defined boundary…

Optics · Physics 2025-01-16 Zukhriddin Ruziev , Kazuhiro Yabana , Anton Husakou

We present the results of theoretical and experimental studies of dispersively coupled (or "membrane in the middle") optomechanical systems. We calculate the linear optical properties of a high finesse cavity containing a thin dielectric…

Optical limiters transmit low-level radiation while blocking electromagnetic pulses with excessively high energy (energy limiters) or with excessively high peak intensity (power limiters). A typical optical limiter absorbs most of the…

Optics · Physics 2015-05-20 Eleana Makri , Tsampikos Kottos , Ilya Vitebskiy

We propose an experiment in which an entangled pair of optical pulses are propagated through non-uniform gravitational fields. A field operator calculation of this situation predicts decoherence of the optical entanglement under…

Quantum Physics · Physics 2007-05-23 T. C. Ralph , G. J. Milburn , T. Downes

We explore the viability of using optical refrigeration as a low-vibration cooling method for a phase-sensitive optomechanical amplifier proposed to improve the sensitivity of future gravitational wave detectors. We find that with moderate…

Optics · Physics 2022-12-06 Samuel Schulz , Yehonathan Drori , Christopher Wipf , Rana X Adhikari

An analysis is given for the Fabry-Perot cavity having a combination of dissipative and dispersive optomechanical coupling. It is established that the combined coupling leads to optical rigidity. At the same time, this rigidity appears in…

Quantum Physics · Physics 2022-06-22 Alexandr Karpenko , Sergey P. Vyatchanin

Beam injection and extraction from a plasma module is still one of the crucial aspects to solve in order to produce high quality electron beams with a plasma accelerator. Proper matching conditions require to focus the incoming high…

A series of thin layers of alternating refractive index is known to make a good optical mirror over certain bands of frequency. Such a device - often termed the Bragg reflector - is usually introduced to students within the first years of…

Optics · Physics 2015-06-12 S. A. R. Horsley , J. -H. Wu , M. Artoni , G. C. La Rocca

We present a microresonator-based system capable of simultaneously producing time-advanced and time-delayed pulses. The effect is based on the combination of a sharp spectral feature with two orthogonally-polarized propagating waveguide…

Grating reflectors have been repeatedly discussed to improve the noise performance of metrological applications due to the reduction or absence of any coating material. So far, however, no quantitative estimate on the thermal noise of these…

It has recently been shown that optical reflection gratings fabricated directly into an atom chip provide a simple and effective way to trap and cool substantial clouds of atoms [1,2]. In this article we describe how the gratings are…

We study the thermodynamics of discrete breathers by transforming a lattice of weakly coupled nonlinear oscillators into an effective Ising pseudospin model. We introduce a replica ensemble and investigate the effective system…

Statistical Mechanics · Physics 2007-05-23 M. Eleftheriou , G. P. Tsironis

We introduce an idea of producing an optical lattice relied on the Talbot effect. Our alternative scheme is based on the interference of light behind a diffraction grating in the near-field regime. We demonstrate 1-D and 2-D optical…

Optics · Physics 2015-06-17 S. Deachapunya , S. Srisuphaphon

A novel approach for measuring linear X-ray polarization over a broad-band using conventional imaging optics and cameras is described. A new type of high efficiency grating, called the critical angle transmission grating is used to disperse…

Astrophysics · Physics 2009-11-13 Herman L. Marshall

Massively multiplexed spectroscopic stellar surveys such as MSE present enormous challenges in the spectrograph design. The combination of high multiplex, large telescope aperture, high resolution (R~40,000) and natural seeing implies that…

Instrumentation and Methods for Astrophysics · Physics 2018-07-25 Will Saunders , Kai Zhang , Thomas Flügel-Paul

Particulate reinforcement of polymeric matrices is a powerful technique for tailoring the mechanical and degradation properties of bioresorbable implant materials. Dispersion of inorganic particles is critical to achieving optimal…

Soft Condensed Matter · Physics 2021-12-15 Reece N. Oosterbeek , Xiang C. Zhang , Serena M. Best , Ruth E. Cameron
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