Dye induced reorientation in methyl red-E7 guest-host system

Authors

Rasmia M. Lalanto National Institute of Physics, University of the Philippines Diliman
Anthony G. Montecillo National Institute of Physics, University of the Philippines Diliman
Marlon Rosendo H. Daza National Institute of Physics, University of the Philippines Diliman
Manuela Fe H. Tarroja-Keller National Institute of Physics, University of the Philippines Diliman
Leonorina G. Cada Institute of Chemistry, University of the Philippines Diliman
Zenaida B. Domingo National Institute of Physics, University of the Philippines Diliman

Abstract

The effect of dye concentration in methyl red-E7 guest-host system was investigated for two cases: without illumination and with illumination. A theoretical model based on Jones matrix calculus was also formulated and it revealed sine-squared birefringence patterns similar to experimental transmission profiles. Phase retardation and phase shift calculations from transmission measurements were also observed to very with dye concentration. Polarized UV-Vis spectra of cells revealed an increasing order parameter with increasing dye concentration until c = 1.25%, above which, the order parameter was observed to decrease considerably as may be effected by a phase separation. Results suggest that dye concertation significantly affects level of ordering in dye-doped liquid crystals (DDLCs) even prior to illumination. Cell illumination with Ar⁺ beam revealed a higher level of ordering after relaxation due to a laser-induced reorientation driven by the trans-cis photoisomerization of methyl red in the green wavelength range.

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Issue

1997: Proceedings of the 15th National Physics Congress of the Samahang Pisika ng Pilipinas

Article ID

SPP-1997-OP-12

Section

Optics and Photonics

Published

1997-10-27

How to Cite

[1]

RM Lalanto, AG Montecillo, MRH Daza, MFH Tarroja-Keller, LG Cada, and ZB Domingo, Dye induced reorientation in methyl red-E7 guest-host system, Proceedings of the Samahang Pisika ng Pilipinas 15, SPP-1997-OP-12 (1997). URL: https://proceedings.spp-online.org/article/view/SPP-1997-OP-12.