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Thick plasma gratings using a local photorefractive effect in CdZnTe:In
Optics Letters
|October 27, 2009
Summary
Persistent diffraction gratings were encoded in cadmium zinc telluride using near-band-gap excitation. These gratings, linked to persistent photoconductivity, remain stable at low temperatures.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- Diffraction gratings are crucial optical components.
- CdZnTe:In is a semiconductor material with potential for optical applications.
- Understanding photoinduced effects is key for device fabrication.
Purpose of the Study:
- To encode persistent diffraction gratings in bulk CdZnTe:In.
- To investigate the mechanism behind the photoinduced index change.
- To assess the stability and persistence of the encoded gratings.
Main Methods:
- Near-band-gap photoexcitation of CdZnTe:In samples.
- Analysis of photoinduced refractive index changes.
- Characterization of grating properties using Bragg diffraction.
- Temperature-dependent stability tests.
Main Results:
- Successfully encoded diffraction gratings in 1.7 mm thick CdZnTe:In.
- Photoinduced index change correlated with persistent photoconductivity from DX center ionization.
- Grating persistence demonstrated at low temperatures.
- No erasure observed with subsequent grating writing.
Conclusions:
- Bulk CdZnTe:In can be used to create persistent diffraction gratings.
- DX center ionization plays a critical role in grating formation and stability.
- The encoded gratings exhibit robust thermal stability and overwrite resistance.
