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An Electron flies above a metal grating without touching it. As the electron passes, each groove scatters its electromagnetic near field at a slightly different time. The emissions interfere and produce what's called Smith-Purcell radiation. This effect is being explored for tunable Terahertz radiation, biomedical spectroscopy, and high-speed communications.

Mathelirium

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21,005 次观看 • 1 个月前 •via X (Twitter)

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$A relativistic electron beam can radiate without striking the metal at all. As the microbunches skim the periodic grating, their evanescent EM field is diffracted into radiation, producing angled wavefronts$

A relativistic electron beam can radiate without striking the metal at all. As the microbunches skim the periodic grating, their evanescent EM field is diffracted into radiation, producing angled wavefronts

Mathelirium

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A single electron can make a pair of metallic nanostructures glow. As it passes through a metallic bowtie gap, its near field excites surface plasmons, concentrating energy into a tiny hotspot before releasing it as light. This is known as Cathodoluminiscence. It is a process of revealing hidden optical modes at the nanoscale.

A single electron can make a pair of metallic nanostructures glow. As it passes through a metallic bowtie gap, its near field excites surface plasmons, concentrating energy into a tiny hotspot before releasing it as light. This is known as Cathodoluminiscence. It is a process of revealing hidden optical modes at the nanoscale.

Mathelirium

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We saw that with Cherenkov Radiation, a charged particle radiates when it outruns light in a medium. A charged particle also radiates when a magnetic field bends its path. This is called Synchrotron Radiation. The faster the particle moves, the more strongly emitted radiation is concentrated in the forward tangential direction.

We saw that with Cherenkov Radiation, a charged particle radiates when it outruns light in a medium. A charged particle also radiates when a magnetic field bends its path. This is called Synchrotron Radiation. The faster the particle moves, the more strongly emitted radiation is concentrated in the forward tangential direction.

Mathelirium

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This is a visualization of a Rydberg wavepacket. In simple terms it is a way of showing an electron in a very highly excited quantum state. The Math comes from the Schrödinger equation for hydrogen where the electron is described by a wavefunction rather than as a tiny ball moving on a fixed path. The yellow sphere at the centre is the proton, not the electron. The colored 3D surface around it shows places where the electron is more likely to be, i.e. a probability cloud.

Mathelirium

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An intense pulse of laser light enters a plasma and what follows is almost unbelievable. The laser pushes plasma electron aside, carving out a charged cavity. As the plasma rushes back, it creates an electric wake that can trap and accelerate another bunch of electrons. This is known as Laser Wakefield Acceleration (LWFA) and is being explored for future accelerator Physics. For this animation, we used a reduced particle-in-cell (PIC) method, coupling particle motion to the self-consistent plasma field on a computational mesh.

An intense pulse of laser light enters a plasma and what follows is almost unbelievable. The laser pushes plasma electron aside, carving out a charged cavity. As the plasma rushes back, it creates an electric wake that can trap and accelerate another bunch of electrons. This is known as Laser Wakefield Acceleration (LWFA) and is being explored for future accelerator Physics. For this animation, we used a reduced particle-in-cell (PIC) method, coupling particle motion to the self-consistent plasma field on a computational mesh.

Mathelirium

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This is a Rubidium Rydberg wavepacket reshaped by an external electric field. The electron is not shown as a particle. The surface represents regions of high probability density, |Ψ|², while the colours show the quantum phase, arg(Ψ).

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Mathelirium

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An electron beam enters a solenoid and immediately begins to twist and focus under the magnetic field. The glowing lines show the field inside the coil, while the surface below reveals how the beam's shape changes as it travels through.

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Mathelirium

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Did you know that a charged particle can actually outrun light? Not light in a vacuum of course. That limit still stands. But inside a dielectric, light travels more slowly. If an electron moves through that material faster than the local phase velocity, something incredible happens... the EM field can no longer rearrange itself smoothly around the particle. A coherent shock front forms. This is known as Cherenkov radiation, named after Russian physicist Pavel Cherenkov who experimentally observed the effect in the 1930s.

Did you know that a charged particle can actually outrun light? Not light in a vacuum of course. That limit still stands. But inside a dielectric, light travels more slowly. If an electron moves through that material faster than the local phase velocity, something incredible happens... the EM field can no longer rearrange itself smoothly around the particle. A coherent shock front forms. This is known as Cherenkov radiation, named after Russian physicist Pavel Cherenkov who experimentally observed the effect in the 1930s.

Mathelirium

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You know an electron, but do you know it's heavier cousin, the muon? In this first episode, both particles are shown as quantum clouds around the same proton. The blue cloud is the electron and the orange cloud is the muon. Since the muon is much heavier, its cloud stays much closer to the proton.

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Korobochka (コロボ) 🇦🇺✝️🇷🇺

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Mathelirium

58,312 次观看 • 4 天前

This is a simulation of a Hydrogen electron described by a superposition of several highly excited Rydberg states. The superposition forms a localized quantum wavepacket that moves around the atom, spreads, splits, and later reforms as the different energy components return to phase.

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Mathelirium

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A Bonus render of Electron Holography for our Quantum Mechanics Lecture Series. We’re staging a TEM-style electron holography shot as a single 3D scene. A coherent electron wave ψ(x,y,t) enters from the left as a localized packet, gets split by a thin biprism phase wedge, then bends around a central nanoring that stands in for an enclosed magnetic flux. The wave evolves by Schrödinger dynamics, so its intensity ρ=|ψ|² is literally the electron detection probability density, while the probability current j=(1/m)Im(ψ*∇ψ) acts like a conserved flow of that density across the plane. The main surface is a living whose height tracks |ψ| and whose skin color cycles with arg(ψ). On top of it, luminous current ribbons trace streamlines of v=j/(ρ+ε), so you can see how phase gradients steer the flow around the ring and back into interference. High above, a tilted detector/hologram screen shows the off-axis fringe image you’d measure (intensity after mixing with a reference wave), while a porcelain bead marks the centroid ⟨x⟩(t) and flux threads through the ring pulse in sync with the Aharonov-Bohm phase knob φ_AB(t). See our lecture series for details. #QuantumMechanics #ElectronHolography #MathematicalPhysics #Physics

Mathelirium

14,252 次观看 • 9 个月前

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There is almost no magnetic field where the electron travels. Yet, the wavefunction still knows the flux is there. This is the Aharonov-Bohm effect. We numerically solved the time-dependent Schrödinger equation with the Aharonov-Bohm vector potential. From the evolving wavefunction, we calculated the probability density and the guage-corrected quantum probability current. Just for aesthetic beauty, we mark probability current as luminous flowing filaments/threads. Probability density is marked by the bright underlying coloured field/cloud.

Mathelirium

24,877 次观看 • 4 天前

$This scene asks a stranger question : What happens if the material has negative refractive index? As the electron moves through the metamaterial slab, the emitted radiation no longer follows the familiar Cherenkov geometry (see below). The energy flow forms a backward-directed cone, extending opposite to the electron's motion. Method used: Finite Element Method with Poynting style energy-flow tracers.$

This scene asks a stranger question : What happens if the material has negative refractive index? As the electron moves through the metamaterial slab, the emitted radiation no longer follows the familiar Cherenkov geometry (see below). The energy flow forms a backward-directed cone, extending opposite to the electron's motion. Method used: Finite Element Method with Poynting style energy-flow tracers.

Mathelirium

13,486 次观看 • 1 个月前

A magnetic field reshapes a Potassium atom's Rydberg electron cloud into a rotating quantum flower.

A magnetic field reshapes a Potassium atom's Rydberg electron cloud into a rotating quantum flower.

Mathelirium

10,348 次观看 • 22 天前

The article is about posted by Zerogeoengineering NEXRAD (Next Generation Weather Radar) systems used for weather forecasting. It claims these radars constantly send out RF/microwave radiation, which acts as a form of pollution in the air. Measurements taken near some NEXRAD sites show very high levels of this radiation — way above what some safety groups consider safe. The article says this pulsed radiation could harm health and the environment, and there’s little monitoring or protection for the public. It argues that people should not be exposed to this without consent and that more attention is needed on this issue. Link in comments 👇🏼

The article is about posted by Zerogeoengineering NEXRAD (Next Generation Weather Radar) systems used for weather forecasting. It claims these radars constantly send out RF/microwave radiation, which acts as a form of pollution in the air. Measurements taken near some NEXRAD sites show very high levels of this radiation — way above what some safety groups consider safe. The article says this pulsed radiation could harm health and the environment, and there’s little monitoring or protection for the public. It argues that people should not be exposed to this without consent and that more attention is needed on this issue. Link in comments 👇🏼

LaShonLuv❤️

16,667 次观看 • 5 个月前

Forgive me guys, Im jus obsessed with these plasma visualizations😍 A relativistic electron beam can rip plasma electrons out of its path and leave behind a positively charged iron cavity. As the driver passes, the light electrons are expelled outward into a dense sheath, while the much heavier ions remain almost stationary.

Forgive me guys, Im jus obsessed with these plasma visualizations😍 A relativistic electron beam can rip plasma electrons out of its path and leave behind a positively charged iron cavity. As the driver passes, the light electrons are expelled outward into a dense sheath, while the much heavier ions remain almost stationary.

Mathelirium

11,879 次观看 • 1 个月前

Mercury is different and beautiful in its own way. It has a global magnetic field, but its very weak. It is offset from the planet's equator and barely holds the solar wind this close to the Sun.

Mercury is different and beautiful in its own way. It has a global magnetic field, but its very weak. It is offset from the planet's equator and barely holds the solar wind this close to the Sun.

Mathelirium

19,828 次观看 • 2 个月前