Temperature dependence of refractive index and thickness for planar thin film phototsensitive acrylate as optical waveguide

R. Mohamed, S. Shaari, Abdul Amir H. Kadhum

Research output: Contribution to journalArticle

Abstract

Polymers are promising candidates for optical waveguides due to several advantages over inorganic materials. Photosensitive polymer films deposited as planar waveguides on glass substrate are investigated for their optical and thermooptic properties. These planar waveguides which are constructed as channel waveguides with patterned mask either as couplers, modulators or other optical devices are useful in signal processing applications for the telecommunication industry. Photosensitive cyclomer acrylate having high transparency from visible to near infra red wavelength were used in this study. Its properties such as refractive index, thickness and modes present are characterized from a spin coated planar thin film. Refractive index at transverse electric mode (TE) and magnetic mode (TM) were determined whilst its thermooptic property with respect to change of temperature were also evaluated. The photosensitive cyclomer which are from different types of photoinitiators and acrylates were tested for its thermal property such as glass transition temperatures and heat capacity. PG1 and PGII cyclomer were found to have refractive index in the range between 1.52 and 1.56 at 1550nm and lower index values at 633nm with He-Ne laser. Refractive index were found to increase with temperature from 30°C but are reduced to lower index above 40°C. Thermoptic coefficient (dn/dT) is not affected for PGI at different transverse modes with lowest dn/dT found for PGII at TM mode. PGI have lower birefringence than PGII at room temperature but is reversed at higher temperature above 50°C and expansion at TE and TM for both cyclomers lies within 1500-2500 ppm/°C.

Original languageEnglish
Pages (from-to)504-509
Number of pages6
JournalMaterials Forum
Volume29
Publication statusPublished - 2005

Fingerprint

Optical waveguides
acrylates
optical waveguides
Refractive index
refractivity
Thin films
temperature dependence
Planar waveguides
thin films
Acrylates
waveguides
Telecommunication industry
Temperature
Optical devices
Birefringence
Polymer films
Transparency
Modulators
Specific heat
Masks

ASJC Scopus subject areas

  • Building and Construction
  • Chemical Engineering (miscellaneous)
  • Polymers and Plastics

Cite this

Temperature dependence of refractive index and thickness for planar thin film phototsensitive acrylate as optical waveguide. / Mohamed, R.; Shaari, S.; Kadhum, Abdul Amir H.

In: Materials Forum, Vol. 29, 2005, p. 504-509.

Research output: Contribution to journalArticle

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