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

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Presentation transcript:

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

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;

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

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

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

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

Capability of SLM

Background Intensity vs. gray level:

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

Setup Sample SLM Camera Microscope Objective

Results P pump =15mW

Results P pump =15mW t transition = 10s

Results P pump =43.73mW t transition = 10s

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

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