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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:
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Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Published on: November 30, 2012

Single-mode waveguide optical isolator based on direction-dependent cutoff frequency.

Lingling Tang1, Samuel M Drezdzon, Tomoyuki Yoshie

  • 1Department of Electrical and Computer Engineering, Fitzpatrick Institute for Photonics, Duke University, Durham, NC 27708-0291, USA. lingling.tang@duke.edu

Optics Express
|October 1, 2008
PubMed
Summary

A novel single-mode-waveguide optical isolator utilizes propagation direction dependent cut-off frequency for isolation. Its bandwidth correlates with material distribution, optimized via perturbation theory for enhanced performance.

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Area of Science:

  • Photonics and Waveguide Technology
  • Optical Devices and Components

Background:

  • Optical isolators are crucial for preventing back reflections in photonic integrated circuits.
  • Existing isolators often face limitations in bandwidth and integration compatibility.
  • Single-mode operation is essential for many advanced photonic applications.

Purpose of the Study:

  • To propose a novel single-mode-waveguide optical isolator design.
  • To investigate the relationship between material distribution and isolation bandwidth.
  • To leverage propagation direction dependent cut-off frequency for device operation.

Main Methods:

  • Utilizing perturbation theory to analyze the optical modes and their properties.
  • Investigating the correlation between the spatial distribution of non-reciprocal materials and device performance.
  • Simulating and analyzing the cut-off frequencies for forward and backward propagating modes.

Main Results:

  • Demonstrated a single-mode-waveguide optical isolator concept.
  • Established a clear correlation between material distribution and isolation bandwidth.
  • Identified that the mode profile dictates the optimal placement of non-reciprocal materials.

Conclusions:

  • The proposed optical isolator design offers a new approach to achieving high isolation in single-mode waveguides.
  • Perturbation theory provides an effective tool for optimizing the material distribution for desired bandwidth.
  • Further research into material selection and fabrication can lead to practical implementations.