Novel mathematical models illuminate light propagation in nonlinear optical fibers

Credit: CC0 Public Domain Data traffic is rapidly growing and can soon overload the current internet infrastructure. The key to solve this overload problem is to improve the data transmission over optical fibers. Vinicius Oliari defended his Ph.D. on new, more accurate mathematical tools to better understand how light propagates through optical fibers the high… Continue reading Novel mathematical models illuminate light propagation in nonlinear optical fibers

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A new record for laser stability across atmospheric distances

Figure 1. Simplified schematic of the phase stabilization system integrated with the optical terminal. Blue lines, rf signals; and red lines, optical signals. Credit: DOI: 10.1103/PhysRevLett.128.020801 A team of researchers at the University of Western Australia has set a record for stability when sending a laser beam across an atmospheric distance. The group describes their… Continue reading A new record for laser stability across atmospheric distances

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Twin-field quantum key distribution (QKD) across an 830-km fibre

Summary of recent long-distance QKD experiments beyond 400 km. In VOA and fibre scenarios, the total numbers of transmitted quantum signals were 3 × 1014 and 3.2 × 1014, respectively. Nature Photonics, https://doi.org/10.1038/s41566-021-00928-2 By using quantum key distribution (QKD), quantum cryptographers can share information via theoretic secure keys between remote peers through physics-based protocols. The laws of quantum physics dictate… Continue reading Twin-field quantum key distribution (QKD) across an 830-km fibre

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Physicists Detect Mysterious X Particles in ‘Primordial Soup’ For The First Time

A mysterious particle thought to have existed briefly just after the Big Bang has now been detected for the first time in the ‘primordial soup’. Specifically, in a medium called the quark-gluon plasma, generated in the Large Hadron Collider by colliding lead ions. There, amid the trillions of particles produced by these collisions, physicists managed… Continue reading Physicists Detect Mysterious X Particles in ‘Primordial Soup’ For The First Time

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Coalescence of two growing bubbles in a Hele–Shaw cell

The bubble distortion is controlled by the hydrodynamic interactions between two growing bubbles. This problem requires the physical consideration of the competition between viscous forces acting on bubbles and their interfacial tensions, as in the case of bubble deformation in a shear flow29. One of the key points is the driving force of the drainage… Continue reading Coalescence of two growing bubbles in a Hele–Shaw cell

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Quantum optical immunoassay: upconversion nanoparticle-based neutralizing assay for COVID-19

The upconversion nanoparticle-based Neutralizing Immunoassay Kit (UNIK) The basic principle of the upconversion nanoparticle-based neutralizing immunoassay kit (UNIK) is shown in Fig. 1. The assay relies on the natural affinity between RBD and ACE-2 protein. To fully take advantage of this property, we employed streptavidin conjugated upconversion nanoparticles and biotinylated RBD to produce the upconversion nanoparticle… Continue reading Quantum optical immunoassay: upconversion nanoparticle-based neutralizing assay for COVID-19

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Nonvolatile electrical switching of optical and valleytronic properties of interlayer excitons

In this work, the HS device is formed by a monolayer WS2 (top) and a monolayer WSe2 (bottom), both of which are contacted with an electrode (Fig. 1a). By applying voltage between the electrode and the heavily-doped Si substrate, we can control the doping level of the device when performing optical measurements. Figure 1b shows… Continue reading Nonvolatile electrical switching of optical and valleytronic properties of interlayer excitons

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Chiral control of quantum states in non-Hermitian spin–orbit-coupled fermions

1. Hasan, M. & Kane, C. Colloquium: topological insulators. Rev. Mod. Phys. 82, 3045 (2010). ADS  Google Scholar  2. Ashida, Y., Gong, Z. & Ueda, M. Non-Hermitian physics. Adv. Phy. 69, 249–435 (2020). ADS  Google Scholar  3. Miri, M.-A. & Alu, A. Exceptional points in optics and photonics. Science 363, eaar7709 (2019). MathSciNet  MATH  Google… Continue reading Chiral control of quantum states in non-Hermitian spin–orbit-coupled fermions

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MXene supported surface plasmons on telecommunications optical fibers

Surface plasmon excitation with MXenes: analytical approach To begin with, let us study the excitation of SPPs in the scenario schematically shown in Fig. 1a. In this case, we can consider a thin layer of MXene (Ti3C2Tx) with thickness “a” sandwiched in between two semi-infinite dielectrics with refractive index n1 and n2 (bottom and top… Continue reading MXene supported surface plasmons on telecommunications optical fibers

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Extracting microplastic decay rates from field data

Extraction of parameters from single time point field data In most current studies, size distributions of microplastic particles are provided by using a discrete scheme for a single time and location. For example, in a study by Klein et al.11, observed particle sizes were represented using three bins for size ranges 0.63-5 mm (bin 1),… Continue reading Extracting microplastic decay rates from field data

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