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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Boundary Conditions: Lossless Lines01:21

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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
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Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

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The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
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Updated: Oct 11, 2025

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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Temporal loss boundary engineered photonic cavity.

Longqing Cong1, Jiaguang Han2,3, Weili Zhang4

  • 1Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China. conglq@sustech.edu.cn.

Nature Communications
|November 27, 2021
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This summary is machine-generated.

Researchers developed a

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Area of Science:

  • Optics and Photonics
  • Quantum Optics

Background:

  • Optical processes are often limited by unavoidable energy losses.
  • Controlling photon dissipation is crucial for optical device performance, similar to controlling vehicle braking.

Purpose of the Study:

  • To introduce and investigate a transient loss boundary as a 'photon brake' in optical cavities.
  • To explore photon dynamics by manipulating the timing and strength of this loss boundary.

Main Methods:

  • Introducing a transient loss boundary into a photon-populated cavity.
  • Modeling the dynamic process using a temporal two-dipole oscillator.
  • Analyzing the real and imaginary parts of permittivity to interpret the transient boundary.

Main Results:

  • Demonstrated the ability to transition coupled cavity photons to an uncoupled state by controlling the loss boundary.
  • Unraveled the mechanism behind spectral oscillations and tunable photon generation during the braking process.
  • Interpreted the transient boundary as a perturbation affecting photon dynamics.

Conclusions:

  • The 'photon brake' concept enables precise control over photon dissipation in optical cavities.
  • This technique facilitates the transition between coupled and uncoupled photonic states.
  • Potential applications include quantum squeezed states, nonreciprocal waveguides, and beam scanning devices.