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Related Concept Videos

Sound Waves: Resonance01:14

Sound Waves: Resonance

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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Design Example: Underdamped Parallel RLC Circuit01:17

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Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
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Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Creating a zero-order resonator using an optical surface transformation.

Fei Sun1,2, Xiaochen Ge1, Sailing He1,2

  • 1State Key Laboratory of Modern Optical Instrumentations, Centre for Optical and Electromagnetic Research, JORCEP, East Building #5,Zijingang Campus, Zhejiang University, Hangzhou 310058, China.

Scientific Reports
|February 19, 2016
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Summary
This summary is machine-generated.

A new open optical resonator design enables subwavelength mode volumes and resonant effects in a continuous spectrum using a single medium. This novel design has potential applications in optical storage and energy manipulation.

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Area of Science:

  • Photonics and optical engineering.
  • Electromagnetics and wave phenomena.

Background:

  • Optical resonators are crucial for various photonic applications, including optical storage.
  • Existing resonators often require complex structures or specific boundary conditions.

Purpose of the Study:

  • To introduce a novel zero-order resonator design using optical surface transformation (OST).
  • To explore the unique features and potential applications of this open resonator.

Main Methods:

  • Design of a zero-order resonator via the optical surface transformation (OST) method.
  • Analysis of resonator properties, including mode volume and spectral characteristics.

Main Results:

  • The proposed resonator exhibits very small mode volumes, potentially in the subwavelength scale.
  • Resonant effects are observed in a continuous spectrum, with no need for reflecting walls.
  • The resonator can be realized using a single homogeneous medium and can adopt arbitrary ring shapes.

Conclusions:

  • The novel open optical resonator offers significant advantages in miniaturization and spectral flexibility.
  • Potential applications include optical storage, power combination, and electromagnetic energy squeezing.