Particle size in polarizing filters

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  • Thread starter Thread starter RogerInHawaii
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SUMMARY

The discussion centers on the particle size required for effective polarization of light through polarizing filters, specifically focusing on herapathite molecules used in polarizer film. It is established that infrared polarizers typically utilize wires spaced approximately 1/4 the wavelength of light to achieve polarization. The references provided include specifications for infrared polarizers from Specac and International Crystal Laboratories, highlighting the importance of particle orientation and size in the polarization process.

PREREQUISITES
  • Understanding of light polarization principles
  • Familiarity with herapathite and its applications in polarizing filters
  • Knowledge of infrared polarizers and their construction
  • Basic concepts of wavelength and its relevance to particle size
NEXT STEPS
  • Research the molecular structure and properties of herapathite
  • Explore the design and functionality of wire-grid infrared polarizers
  • Investigate the relationship between particle size and light wavelength in polarization
  • Learn about advancements in polarizing filter technology and materials
USEFUL FOR

Optical engineers, physicists, and anyone involved in the design and application of polarizing filters in various technologies.

RogerInHawaii
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I know that light can be polarized by passing through a medium that has linear particles all oriented in the same direction. But what size particles are necessary to do that?
 
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I couldn't find information about the size of of herapathite molecules (used in polarizer film), but infrared polarizers often consist of wires spaced apart around 1/4 the wavelength:

http://www.specac.com/products/infrared-polarizer/wire-grid-infrared-polarizer/654
http://www.internationalcrystal.net/icl59a.htm
 
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