A 246dB/m loss is observed in the LP11 mode at a wavelength of 1550nm. Such fibers are a focus of our discussion on their potential use in high-fidelity, high-dimensional quantum state transmission.
With the 2009 shift in ghost imaging (GI) from pseudo-thermal to computational approaches utilizing spatial light modulators, computational GI has enabled image creation through the use of a single-pixel detector, resulting in a cost-effective solution in some uncommon wavebands. We propose, in this letter, a computational analog of ghost diffraction (GD), termed computational holographic ghost diffraction (CH-GD), to computationally model ghost diffraction. This model uses self-interferometer-assisted field correlation measurements, not intensity correlation functions. More than just the diffraction pattern, CH-GD provides the complex amplitude of the diffracted light field from an unknown complex volume. Consequently, digital refocusing at any depth within the optical link is achievable. In parallel, CH-GD exhibits the potential for acquiring multimodal data, including intensity, phase, depth, polarization, and/or color, in a more compact and lensless form.
Coherent combining of two distributed Bragg reflector (DBR) lasers within a cavity yielded an 84% efficiency on a generic InP foundry platform, as detailed in this report. In both gain sections, the intra-cavity combined DBR lasers deliver 95mW of on-chip power at a 42mA injection current simultaneously. GSK1210151A clinical trial The single-mode operation of the combined DBR laser yields a side-mode suppression ratio of 38 decibels. The monolithic method is key to constructing high-power, compact lasers, thereby supporting the scaling of integrated photonic technologies.
This correspondence highlights a new deflection effect that emerges during the reflection of an intense spatiotemporal optical vortex (STOV) beam. The specular reflection angle of a STOV beam, of relativistic intensities surpassing 10^18 watts per square centimeter, is altered when encountering an overdense plasma target, deviating within the plane of incidence. Through the utilization of two-dimensional (2D) particle-in-cell simulations, we established that the standard deflection angle is around a few milliradians, and this angle can be augmented by an enhanced STOV beam with precisely focused dimensions and an amplified topological charge. In spite of its resemblance to the angular Goos-Hanchen effect, deviation from a STOV beam is present at normal incidence, showcasing a distinctly nonlinear effect. Employing both angular momentum conservation and the Maxwell stress tensor, this novel effect is explained. It has been established that the asymmetric light pressure of the STOV beam breaks the rotational symmetry of the target, which manifests as a non-specular reflection. The shear action of the Laguerre-Gaussian beam, acting solely at oblique incidence, stands in contrast to the broader deflection characteristics of the STOV beam, extending to normal incidence.
From particle capture to quantum information processing, vector vortex beams (VVBs) with non-uniform polarization states play a crucial role in a wide range of applications. A theoretical exploration of a generalized design for all-dielectric metasurfaces in the terahertz (THz) band is presented, exhibiting a longitudinal evolution from scalar vortices with homogeneous polarization to inhomogeneous vector vortices with singular polarization characteristics. The converted VVBs' order can be chosen arbitrarily by modifying the topological charge embedded in two orthogonal circular polarization channels. The extended focal length and initial phase difference ensure the seamless longitudinal switchable behavior. A method for generating vector metasurfaces can be implemented as a design strategy that aids in understanding distinctive singular properties of THz optical fields.
A lithium niobate electro-optic (EO) modulator, featuring low loss and high efficiency, is demonstrated using optical isolation trenches to improve field confinement and decrease light absorption. The modulator's design, as proposed, exhibited significant improvements: a low half-wave voltage-length product of 12Vcm, a 24dB excess loss, and a 3-dB EO bandwidth extending beyond 40GHz. We fabricated a lithium niobate modulator, which, according to our assessment, boasts the highest reported modulation efficiency among Mach-Zehnder interferometer (MZI) modulators.
A new approach for amplifying idler energy in the short-wave infrared (SWIR) range stems from the combination of chirped pulse amplification, optical parametric amplification, and transient stimulated Raman amplification. An optical parametric chirped-pulse amplification (OPCPA) system's output pulses, encompassing signal wavelengths from 1800nm to 2000nm and idler wavelengths from 2100nm to 2400nm, were employed as pump and Stokes seed, respectively, in a stimulated Raman amplifier based on a KGd(WO4)2 crystal. Both the OPCPA and its supercontinuum seed received 12-ps transform-limited pulses from a YbYAG chirped-pulse amplifier. The Raman chirped-pulse amplifier, operating in a transient mode, boosts idler energy by 33% and delivers 53-femtosecond pulses with near-transform-limited characteristics after compression.
An optical fiber whispering gallery mode microsphere resonator, based on the coupling of a cylindrical air cavity, is proposed and shown in this letter. A single-mode fiber's core was contacted by a vertically-oriented cylindrical air cavity, precisely crafted through a method that combines femtosecond laser micromachining and hydrofluoric acid etching, which is aligned to the fiber's axis. A microsphere is installed inside the cylindrical air cavity, having a tangential connection to the cavity's interior wall, which is in contact with, or is contained inside the fiber core. Light traveling within the fiber core, when its path is tangential to the intersection of the microsphere and inner cavity wall, undergoes evanescent wave coupling into the microsphere. This process results in whispering gallery mode resonance, provided the phase-matching criterion is fulfilled. This device's integration is substantial, its structure robust, its cost minimal, its operation steady, and its quality factor (Q) a high 144104.
Quasi-non-diffracting light sheets, sub-diffraction-limit in nature, are instrumental in augmenting the resolution and field of view of light sheet microscopes. Unfortunately, an ongoing problem with sidelobes continues to result in high background noise levels. A method for generating sidelobe-suppressed SQLSs, optimized through a self-trade-off strategy, is presented using super-oscillatory lenses (SOLs). The generated SQLS showcases sidelobes limited to 154%, simultaneously fulfilling the requirements of sub-diffraction-limit thickness, quasi-non-diffracting properties, and suppressed sidelobes, particularly for static light sheets. The self-trade-off optimized technique facilitates a window-like energy allocation, substantially reducing the intensity of the sidelobes. Within the window, an SQLS featuring 76% theoretical sidelobes is attained, offering a new methodology for light sheet sidelobe control, demonstrating significant potential for high signal-to-noise light sheet microscopy (LSM).
The development of nanophotonic thin-film structures, allowing for spatial and frequency-selective optical field coupling and absorption, is a significant objective. We demonstrate a 200-nm-thick, randomly structured metasurface, composed of refractory metal nanoresonators, achieving near-unity absorption (absorptivity exceeding 90%) across the visible and near-infrared spectrum (380-1167 nanometers). Of particular importance, the resonant optical field concentrates in distinct spatial regions dependent on the frequency, providing a viable methodology for artificially manipulating spatial coupling and optical absorption through spectral control. SPR immunosensor The conclusions and methodologies developed here apply across a broad energy spectrum and find utility in frequency-selective nanoscale optical field manipulation.
Ferroelectric photovoltaic performance is inherently constrained by the inverse relationship linking polarization, bandgap, and leakage. This work proposes a lattice strain engineering strategy, contrasting with conventional methods of lattice distortion, by introducing a (Mg2/3Nb1/3)3+ ion group into the B-site of BiFeO3 films, resulting in the creation of local metal-ion dipoles. The BiFe094(Mg2/3Nb1/3)006O3 film, through the strategic engineering of lattice strain, simultaneously achieved a substantial remanent polarization of 98 C/cm2, a bandgap reduced to 256 eV, and a leakage current almost two orders of magnitude lower, successfully negating the inverse relationship among these critical characteristics. blood biomarker The photovoltaic effect resulted in an exceptional open-circuit voltage of 105V and a remarkable short-circuit current of 217 A/cm2, signifying an excellent photovoltaic response. A new strategy for enhancing the performance of ferroelectric photovoltaics is presented in this work, capitalizing on the lattice strain generated by local metal-ion dipoles.
A framework is developed for the production of stable optical Ferris wheel (OFW) solitons, operating within a nonlocal Rydberg electromagnetically induced transparency (EIT) medium. An appropriate nonlocal potential, stemming from the strong interatomic interaction in Rydberg states, is obtained through precise optimization of atomic density and one-photon detuning, thereby perfectly compensating for the diffraction of the probe OFW field. Fidelity measurements, from numerical simulations, exceed 0.96, with the propagation distance exceeding 160 diffraction lengths. The analysis of higher-order optical fiber wave solitons includes those with arbitrary winding numbers. By using cold Rydberg gases, our investigation demonstrates a clear route to generate spatial optical solitons in the nonlocal response domain.
Numerical analysis is applied to high-power supercontinuum generation fueled by modulational instability. The spectra emitted by these sources extend up to the infrared absorption edge, producing a strong, narrow blue peak (with dispersive wave group velocity matching solitons at the infrared loss edge) and a significant reduction in intensity at adjacent longer wavelengths.
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