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Related Concept Videos

Sound Waves: Resonance01:14

Sound Waves: Resonance

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...
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:
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:
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not immune...
Series Resonance01:17

Series Resonance

The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...

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Fabrication and Characterization of Superconducting Resonators
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Coupled Fano resonators.

Xiaoguang Tu1, Landobasa Y Mario, Ting Mei

  • 1Nanophotonics Lab, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.

Optics Express
|October 14, 2010
PubMed
Summary
This summary is machine-generated.

We developed coupled Fano structures combining Fabry-Perot cavities and SCISSORs. These structures exhibit enhanced sensitivity for index sensing and potential for tunable optical filters and slow light applications.

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Area of Science:

  • Optics and Photonics
  • Resonator Physics

Background:

  • Fano resonances offer sharp spectral features useful in optical devices.
  • Coupled resonator systems like Fabry-Perot cavities (DCFPC) and SCISSORs have been explored for optical applications.

Purpose of the Study:

  • To theoretically investigate coupled Fano structures integrating DCFPC and SCISSOR characteristics.
  • To analyze asymmetric and symmetric Fano resonances in single and doubly-coupled units.
  • To explore potential applications in sensing, filtering, and slow light.

Main Methods:

  • Analytical derivation of Fano resonances using the Fabry-Perot approach.
  • Theoretical modeling of single and doubly-coupled Fano unit structures.
  • Comparison of performance metrics with existing DCFPC and SCISSOR systems.

Main Results:

  • Doubly-coupled Fano units exhibit an asymmetric Electromagnetically Induced Transparency (EIT)-like lineshape.
  • The proposed structure demonstrates an index-changing sensitivity of 10^-6, two orders higher than single Fano resonators.
  • A novel frequency detuning method for EIT-like lineshapes was identified in doubly-coupled units.
  • Multiple coupled Fano units show significantly higher group delay compared to SCISSORs and DCFPCs for slow light applications.

Conclusions:

  • Coupled Fano structures offer enhanced performance for optical sensing applications.
  • The unique EIT-like lineshape and frequency detuning in doubly-coupled units are significant findings.
  • These structures hold promise for developing advanced tunable optical filters and efficient slow light devices.