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Related Concept Videos

Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

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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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An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Slow-light element for tunable time delay based on optical microcoil resonator.

Chengju Ma1, Liyong Ren, Yiping Xu

  • 1State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, China.

Applied Optics
|September 13, 2012
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Researchers developed a compact optical microcoil resonator (OMR) for tunable slow-light propagation. This device offers a significant time delay, paving the way for advanced optical signal processing applications.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Quantum Optics

Background:

  • Slow light phenomena enable enhanced light-matter interactions.
  • Optical resonators are crucial components in photonic integrated circuits.
  • Controlling light propagation speed is essential for optical buffering and signal processing.

Purpose of the Study:

  • To propose and analyze a novel, compact slow-light element.
  • To investigate tunable slow-light propagation using an optical microcoil resonator (OMR).
  • To provide a general solution for OMRs based on coupled-wave equations.

Main Methods:

  • Utilized an optical microcoil resonator (OMR) composed of two microfiber coils.
  • Employed the matrix exponential method to solve coupled-wave equations for the OMR.
  • Simulated tunable slow-light propagation by adjusting the coupling coefficient via applied voltage to a ferroelectric crystal.

Main Results:

  • Achieved a tunable slow-light propagation.
  • Demonstrated a slow-light time delay of up to 62 picoseconds.
  • Observed a bandwidth of 0.4 nm around a wavelength of 1.5 μm.

Conclusions:

  • The proposed OMR is a simple and compact element for achieving slow light.
  • Tunable control of slow-light propagation is feasible by electro-optic modulation of the coupling coefficient.
  • The OMR shows potential for applications in optical buffering and signal processing.