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Channel Rhodopsins01:11

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Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Steric-repulsion-based magnetically responsive photonic crystals.

Wei Luo1, Huiru Ma, Fangzhi Mou

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China.

Advanced Materials (Deerfield Beach, Fla.)
|November 28, 2013
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Summary

Researchers developed novel magnetically responsive photonic crystals (MRPCs) using superparamagnetic iron oxide nanocrystals. These tunable photonic crystals offer broad color range and stability, enabling practical applications.

Keywords:
magnetic photonic crystalsmagnetitepolyvinylpyrrolidonesteric repulsionsurface polymers

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Photonic crystals offer unique light manipulation properties.
  • Developing magnetically responsive photonic crystals (MRPCs) is crucial for tunable optical devices.
  • Existing MRPCs often face limitations in color tunability and environmental stability.

Purpose of the Study:

  • To construct the first steric-repulsion-based magnetically responsive photonic crystals (MRPCs).
  • To achieve a broad, tunable color spectrum for MRPCs.
  • To assess the stability of MRPCs under varying environmental conditions.

Main Methods:

  • Synthesized uniform superparamagnetic polyvinylpyrrolidone-coated Fe3 O4 colloidal nanocrystal clusters.
  • Fabricated MRPCs utilizing steric repulsion forces.
  • Investigated color tunability across solvents with diverse polarities.
  • Evaluated MRPC performance concerning ionic strength and pH.

Main Results:

  • Successfully constructed novel steric-repulsion-based MRPCs.
  • Achieved a color tunable range covering almost the entire visible spectrum.
  • Demonstrated that the color tunability is insusceptible to ionic strength and pH variations.
  • Confirmed the potential for practical applications due to robust performance.

Conclusions:

  • The developed MRPCs represent a significant advancement in tunable photonic materials.
  • The steric-repulsion-based design offers broad spectral tunability and environmental robustness.
  • These findings pave the way for advanced optical sensors, displays, and smart materials.