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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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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Low-loss suspended quantum well waveguides.

T H Stievater1, W S Rabinovich, D Park

  • 1Naval Research Laboratory, Washington, DC 20375, USA. stievater@nrl.navy.mil

Optics Express
|June 11, 2008
PubMed
Summary
This summary is machine-generated.

We fabricated suspended indium gallium arsenide/indium gallium arsenide phosphide (InGaAs/InGaAsP) quantum well waveguides using surface micromachining. These waveguides exhibit low propagation loss, making them suitable for optical applications.

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Area of Science:

  • Optoelectronics and Photonics
  • Materials Science
  • Semiconductor Devices

Background:

  • Integrated optical circuits require low-loss waveguides.
  • Indium Gallium Arsenide Phosphide (InGaAs/InGaAsP) quantum wells offer tunable optical properties.
  • Surface micromachining enables the fabrication of complex micro- and nanostructures.

Purpose of the Study:

  • To fabricate suspended InGaAs/InGaAsP quantum well waveguides using surface micromachining.
  • To characterize the optical propagation loss of these novel waveguide structures.
  • To assess the feasibility of these waveguides for optical communication applications.

Main Methods:

  • Surface micromachining technique for waveguide fabrication.
  • Fabrication of suspended waveguides supported by lateral tethers.
  • Optical loss measurements in the L-band (1565-1625 nm).

Main Results:

  • Successfully fabricated suspended InGaAs/InGaAsP quantum well waveguides.
  • Measured average transverse electric (TE) propagation loss of 4.1 dB/cm.
  • Measured average TE loss per tether pair of 0.21 dB at wavelengths near the quantum well band gap.

Conclusions:

  • Suspended InGaAs/InGaAsP quantum well waveguides can be fabricated using surface micromachining.
  • The demonstrated propagation losses are promising for integrated photonic applications.
  • Further optimization could lead to even lower loss values for advanced optical devices.