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Related Concept Videos

Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

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:
RLC Circuit as a Damped Oscillator01:30

RLC Circuit as a Damped Oscillator

An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

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
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Resonance in an AC Circuit01:26

Resonance in an AC Circuit

The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...

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Fabrication and Characterization of Superconducting Resonators
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Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

A self-coupling multi-port microcoil resonator.

Rand Ismaeel1, Timothy Lee, Feras Al-Saab

  • 1Optoelectronics Research Centre, University of Southampton, Highfield, Southampton, SO17 1BJ, UK. rmni1g10@orc.soton.ac.uk

Optics Express
|April 20, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel self-coupling multi-port microcoil resonator. This device uses a microfiber coupler to achieve optical resonance, enhancing extinction ratio and spectral control for optical sensing applications.

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Area of Science:

  • Optoelectronics
  • Nanophotonics
  • Optical Resonators

Background:

  • Microfiber couplers are essential components in integrated optics.
  • Optical resonators are key for sensing and filtering applications.
  • Developing robust and tunable micro-optical devices is an ongoing challenge.

Purpose of the Study:

  • To introduce a novel self-coupling multi-port microcoil resonator.
  • To investigate the optical resonance mechanism in the proposed structure.
  • To analyze the impact of structural parameters on the resonator's performance.

Main Methods:

  • Fabrication of microresonators by coiling a four-port microfiber coupler around a low-index support rod.
  • Inducing optical resonance through coupling between adjacent turns of the coiled microfiber.
  • Embedding the microcoil resonator in a low refractive index polymer for enhanced robustness.
  • Analysis of polarization dependence and spectral characteristics.

Main Results:

  • Successful fabrication of a self-coupling multi-port microcoil resonator.
  • Demonstration of optical resonance via inter-turn coupling.
  • Achieved an increased extinction ratio due to sustained supermode beating.
  • Observed strong dependence of the output spectrum on the microfiber coupler diameter.
  • Improved robustness and analyzed polarization effects.

Conclusions:

  • The presented self-coupling multi-port microcoil resonator offers a novel approach for optical resonance.
  • The device exhibits tunable spectral properties and enhanced extinction ratios.
  • The integration with a low-index polymer improves device robustness, paving the way for practical applications in optical sensing and filtering.