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Liquid Crystal Elastomer Response to Light

This study examines the response of Liquid Crystal Elastomers (LCEs) to light exposure, highlighting the use of Spatial Light Modulators (SLMs) as dynamic elements in experimental setups. Key objectives include understanding LCE behavior when subjected to varying light intensities and developing techniques to control the elastomer movement spatially and temporally. Results demonstrate how SLMs can manipulate light intensity over samples, leading to precise movements in LCEs. The research emphasizes the potential applications of these materials in responsive technologies.

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Liquid Crystal Elastomer Response to Light

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  1. Liquid Crystal Elastomer Response to Light Rafael Soares Zola CPIP-LCI Advisor: Peter Palffy-Muhoray

  2. Objectives • Observe the response of the Liquid Crystal Elastomer (LCE) to a source of light; • Understand the key features of the Spatial Light Modulator (SLM); • Use the SLM as a dynamic element; • Apply light with intensity varying with position and time on the sample;

  3. 4.0mm 7.5mm Background • Liquid Crystal Elastomer*: Rubber and Liquid Crystal! Doped Cross-Linker (12%) Mesogen Backbone azo dye Disperse Orange III *M. Camacho-Lopez, et al Nature Materials 3, 307 (2004).

  4. Background • Change in the degree of order: • cis-trans transition (Azo Dye) • temperature • The free energy of the elastomer coupling term liquid crystal rubber

  5. Background • SLM: Twisted Nematic cell used as dynamic element in experimental setups

  6. Background Transmissive SLM Number of pixels:832 x 624 Pixel pitch: 32m Image frame rate: max. 60Hz Active area: 26.6mm x 20.0mm Laser through Computer Image

  7. Capability of SLM

  8. Background • Intensity vs. gray level:

  9. Analyzer Lens Polarizer Mirror Argon Laser - CW - =514nm Camera Sample Filter 514nm Computer Setup

  10. Setup Microscope Objective SLM Camera Sample

  11. Results Ppump=15mW

  12. Results Ppump=15mW ttransition= 10s

  13. Results Ppump=43.73mW ttransition= 10s

  14. Conclusions • The SLM can be used to control the intensity over the sample spatially and temporally • This control allows one to move the LCE in some specific manner • Coordinated movements depends on accurate control of the beam over the sample

  15. Acknowledgements Especial Thanks for: Dr. Michele Moreira (muito obrigado mesmo!!) Jake Fontana Jeremy Neal

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