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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...

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Updated: Jul 8, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Dual microwave and optical oscillator.

X S Yao, L Maleki

    Optics Letters
    |January 12, 2008
    PubMed
    Summary

    This study introduces a new device that couples microwave and optical oscillations. It can generate subpicosecond optical pulses and spectrally pure microwave signals over 70 GHz.

    Area of Science:

    • Physics
    • Optics
    • Microwave Engineering

    Background:

    • Coupling microwave and optical oscillations is crucial for advanced signal generation.
    • Existing methods face limitations in achieving high-frequency microwave signals and ultrashort optical pulses simultaneously.

    Purpose of the Study:

    • To demonstrate a novel device for directly coupled microwave and optical oscillations.
    • To achieve simultaneous generation of subpicosecond optical pulses and spectrally pure microwave signals.

    Main Methods:

    • Development of a novel device architecture enabling direct coupling.
    • Experimental demonstration of the device's oscillation generation and coupling capabilities.

    Main Results:

    • Successful generation of coupled microwave and optical oscillations.

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  • Demonstrated capability for producing stable optical pulses at the subpicosecond level.
  • Achieved spectrally pure microwave signals at frequencies exceeding 70 GHz.

    • Conclusions:

    • The novel device successfully integrates microwave and optical oscillation generation.
    • This technology offers a promising pathway for simultaneous generation of high-performance optical and microwave signals.