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Related Concept Videos

Cascaded Op Amps01:16

Cascaded Op Amps

Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...

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Enhanced bandwidth and reduced dispersion through stacking multiple optical metamaterials.

Matthew D Escarra1, Sukosin Thongrattanasiri, William O Charles

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

Optics Express
|September 22, 2011
PubMed
Summary

Researchers enhanced all-semiconductor metamaterials for mid-infrared applications. Stacking multiple metamaterials improved bandwidth by 27% and reduced frequency dispersion, overcoming key limitations for practical use.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • All-semiconductor metamaterials offer a path to negative refraction in the mid-infrared spectrum.
  • Their practical application is hindered by significant frequency dispersion and narrow spectral bandwidth.

Purpose of the Study:

  • To overcome limitations of single-stack metamaterials.
  • To enhance spectral bandwidth and reduce frequency dispersion in mid-infrared metamaterials.

Main Methods:

  • Fabrication of compound metamaterials by stacking multiple layers.
  • Varying the thickness and doping concentration of individual metamaterial layers.
  • Characterization of optical properties and performance metrics.

Main Results:

  • Achieved a 27% increase in spectral bandwidth compared to single-stack designs.
  • Demonstrated a significant reduction in frequency dispersion.
  • Validated the effectiveness of the compound metamaterial approach.

Conclusions:

  • Compound metamaterials offer a viable solution for broadening bandwidth and reducing dispersion.
  • This advancement expands the potential applications of all-semiconductor metamaterials in the mid-infrared.
  • The developed approach paves the way for more robust and versatile optical devices.