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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...
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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:
Sound Waves: Interference00:53

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Coherent interference induced transparency in self-coupled optical waveguide-based resonators.

Linjie Zhou1, Tong Ye, Jianping Chen

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. ljzhou@sjtu.edu.cn

Optics Letters
|January 7, 2011
PubMed
Summary
This summary is machine-generated.

We demonstrate a novel self-coupled optical waveguide resonator that mimics electromagnetically induced transparency (EIT). This EIT-like effect arises from internal interference, with phase shifts significantly altering spectral properties and dispersion in resonator arrays.

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Area of Science:

  • Photonics and Optical Engineering
  • Quantum Optics
  • Materials Science

Background:

  • Electromagnetically induced transparency (EIT) is a quantum interference phenomenon.
  • Optical resonators are crucial for manipulating light-matter interactions.
  • Self-coupled optical waveguides (SCOWs) offer unique light confinement and interference properties.

Purpose of the Study:

  • To propose and investigate a self-coupled optical waveguide (SCOW)-based resonator for generating an EIT-like optical resonance.
  • To analyze the spectral behavior of cascaded SCOW resonators influenced by phase shifts.
  • To explore the dispersion characteristics of infinite SCOW resonator arrays.

Main Methods:

  • Theoretical modeling of a SCOW resonator to achieve EIT-like phenomena.
  • Analysis of coherent interference between two resonance paths within the SCOW.
  • Simulation of cascaded SCOW resonators to observe spectral splitting and flattening.
  • Investigation of dispersion relations and group indices in infinite SCOW arrays with varying phase shifts.

Main Results:

  • An EIT-like optical resonance is successfully generated in the SCOW resonator.
  • Cascaded SCOW resonators exhibit spectral modifications (flattening or splitting) dependent on inter-resonator phase shifts.
  • Significant tunability of dispersion relation and group index in the EIT subband is achieved through small phase shifts in infinite arrays.

Conclusions:

  • SCOW resonators provide a viable platform for realizing EIT-like effects.
  • Phase control in cascaded SCOW systems is critical for spectral shaping.
  • SCOW resonator arrays offer a promising route for tunable optical dispersion engineering.