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Related Concept Videos

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:
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:
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...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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...

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Related Experiment Video

Updated: May 19, 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

Perpendicular coupler for whispering-gallery resonators.

Fang-Jie Shu1, Chang-Ling Zou, Fang-Wen Sun

  • 1Department of Physics, Shangqiu Normal University, Shangqiu 476000, China. shufangjie@gmail.com

Optics Letters
|August 4, 2012
PubMed
Summary
This summary is machine-generated.

We developed a novel perpendicular coupler (PC) for whispering-gallery resonators, achieving high coupling efficiency without phase matching. This compact waveguide design enhances light collection for resonator applications.

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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

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Last Updated: May 19, 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

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Area of Science:

  • Optics and Photonics
  • Nanophotonics
  • Resonator Science

Background:

  • Whispering-gallery resonators are crucial for various photonic applications.
  • Efficient coupling is essential for maximizing resonator performance.
  • Existing coupling methods often require strict phase-matching conditions and occupy significant space.

Purpose of the Study:

  • To introduce and characterize a novel perpendicular coupler (PC) for whispering-gallery resonators.
  • To demonstrate high coupling efficiency and space-saving integration.
  • To investigate the spectral characteristics and parameter sensitivity of the PC.

Main Methods:

  • Design and simulation of a near-field waveguide perpendicular coupler.
  • Analysis of coupling efficiency using theoretical and numerical methods.
  • Investigation of spectral response (Fano-shape) and collection efficiency enhancement.

Main Results:

  • The PC achieves highly efficient tunneling coupling without phase matching.
  • The reflection spectrum exhibits an asymmetric Fano-shape near resonance.
  • Collection efficiency enhancement using near-field scatterers reached a maximum of approximately 75%.
  • Simulations indicate low sensitivity to critical parameters like waveguide refractive index.

Conclusions:

  • The perpendicular coupler offers a compact and efficient solution for coupling light to whispering-gallery resonators.
  • The demonstrated Fano-shape and enhanced collection efficiency are advantageous for device performance.
  • The PC's robustness to parameter variations makes it ideal for practical applications in integrated photonics.