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Surface relief gratings induced by a nanosecond pulse in a liquid-crystalline azo-polymethacrylate

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7 Author(s)
Rodriguez, F.J. ; Departamento de Física de la Materia Condensada, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain ; Sanchez, C. ; Villacampa, B. ; Alcala, R.
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Surface relief gratings have been generated in an azobenzene side chain liquid-crystal polymer using an intensity interference pattern from two coherent laser pulses (532 nm and 4 ns). We elucidate whether peaks or trenches correspond to the high intensity regions of the interference pattern. For low-energy pulses, peaks are generated in the irradiated areas while trenches appear for energies above a threshold (around 100 mJ/cm2 per beam). This phenomenology, together with the lack of relief when polarization patterns are used, indicates that in this polymer surface relief has a thermal origin.

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Applied Physics Letters  (Volume:87 ,  Issue: 20 )