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Propagation of Waves01:07

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Linear momentum is a fundamental concept in physics that describes the motion of an object. It is a vector quantity, having a magnitude equal to the product of its mass and its velocity, and direction along the object's velocity. On the other hand, linear impulse, also known as momentum impulse, is a concept in physics related to the change in the linear momentum of an object. Impulse is a vector quantity defined as the product of force and the time over which the force is applied.
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Propagation Speed of Electromagnetic Waves01:30

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In the context of a system of particles moving relative to an inertial frame of reference, the equation of motion is a crucial tool for understanding the dynamics of the system. This equation, which accounts for external forces acting on each particle, plays a fundamental role in describing the system's behavior.
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Potential Due to a Polarized Object01:29

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Updated: Aug 26, 2025

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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First-principles method for nonlinear light propagation at oblique incidence.

Mitsuharu Uemoto, Kazuhiro Yabana

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    We developed a new computational method to simulate intense, ultrashort laser pulse interactions with surfaces. This multiscale approach accurately models nonlinear light propagation and electron behavior for enhanced material analysis.

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    Area of Science:

    • Computational physics
    • Materials science
    • Quantum mechanics

    Background:

    • Understanding light-matter interactions is crucial for materials science.
    • Simulating nonlinear optics requires advanced computational techniques.
    • Modeling electron dynamics alongside light propagation presents a challenge.

    Purpose of the Study:

    • To develop a novel computational method for describing nonlinear light propagation.
    • To simulate intense and ultrashort laser pulses at oblique incidence.
    • To couple macroscopic light propagation with microscopic electron dynamics.

    Main Methods:

    • Utilized a multiscale modeling approach.
    • Simultaneously solved coupled macroscopic and microscopic equations.
    • Employed first-principles time-dependent density functional theory for electron dynamics.
    • Transformed Maxwell equations into one-dimensional wave equations.

    Main Results:

    • Successfully developed a method to describe nonlinear light propagation.
    • Demonstrated the method's capability through an example of silicon thin film.
    • Enabled simultaneous simulation of light propagation and electron dynamics.

    Conclusions:

    • The developed multiscale computational method is effective for simulating complex light-matter interactions.
    • This approach provides a powerful tool for studying nonlinear optical phenomena.
    • The method offers insights into the behavior of intense ultrashort pulses on material surfaces.