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Characterization of a liquid crystal microlens array using multiwalled carbon nanotube electrodes
Xiaozhi Wang1, Timothy D Wilkinson, Mark Mann
1Electrical Engineering Division, University of Cambridge, 9 JJ Thompson Avenue, CB3 0FA, UK. xw224@mit.edu
Applied Optics
|June 12, 2010
Summary
Researchers developed reconfigurable liquid crystal microlenses using multiwalled carbon nanotubes (MWNTs). These novel microlenses can focus light with tunable focal lengths, offering potential for advanced optical systems.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Liquid crystal microlenses offer tunable optical properties.
- Carbon nanotubes provide unique electrical and structural characteristics for device fabrication.
Purpose of the Study:
- To design and fabricate reconfigurable liquid crystal microlenses utilizing multiwalled carbon nanotubes (MWNTs).
- To investigate the alignment behavior of liquid crystals with MWNTs under electric fields.
- To characterize the focusing capabilities and focal length tunability of the fabricated microlenses.
Main Methods:
- Fabrication of microlens cells using plasma-enhanced chemical vapor deposition for MWNT growth on silicon.
- Integration of indium tin oxide coated glass as a top electrode.
- Filling the cell gap with nematic liquid crystal (BLO48).
- Utilizing simulations to analyze liquid crystal alignment with MWNTs under electric fields.
- Conducting polarized light experiments to measure focal lengths.
Main Results:
- Successfully designed and fabricated reconfigurable liquid crystal microlenses with MWNT arrays.
- Simulations showed liquid crystal alignment with MWNTs, significantly enhanced by external electric fields.
- Polarized light experiments demonstrated light focusing with adjustable focal lengths from 7 to 12 microm.
Conclusions:
- The developed MWNT-based liquid crystal microlenses exhibit reconfigurable focusing properties.
- The integration of MWNTs enhances the electro-optic response of liquid crystal microlenses.
- These microlenses hold promise for applications in adaptive optics and micro-optical systems.
