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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

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Published on: November 30, 2012

Sub-diffraction negative and positive index modes in mid-infrared waveguides.

Anthony J Hoffman1, Viktor A Podolskiy, Deborah L Sivco

  • 1Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA. ajhoffma@princeton.edu

Optics Express
|October 15, 2008
PubMed
Summary

This study details a novel anisotropic waveguide. It exhibits unique left-handed and right-handed light guiding properties, confirmed by simulations.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Photonics

Background:

  • Anisotropic waveguides are crucial for advanced optical devices.
  • Understanding light propagation in layered heterostructures is key for photonic integration.

Purpose of the Study:

  • To characterize a strongly anisotropic waveguide composed of alternating InGaAs and AlInAs layers.
  • To investigate the transition from left-handed to right-handed light guiding phenomena.
  • To compare experimental findings with theoretical simulations.

Main Methods:

  • Fabrication of a multilayered waveguide structure on an InP substrate.
  • Optical characterization using transverse magnetic (TM) reflection spectroscopy.
  • Comparison with finite element and transfer-matrix frequency domain simulations.

Main Results:

  • Observed a strong increase in TM reflection at 8.4 micrometers, indicating a low-order mode cutoff for left-handed guiding.
  • Documented a decrease in TM reflection at 11.5 micrometers, signifying the onset of right-handed no-cutoff light guiding.
  • Achieved good qualitative agreement between experimental data and simulation results.

Conclusions:

  • The characterized waveguide demonstrates distinct left-handed and right-handed light guiding behaviors.
  • The study validates the design principles for anisotropic waveguides with tunable optical properties.
  • This work contributes to the development of novel photonic devices utilizing metamaterial concepts.