Ultraviolet writing of buried waveguide devices in epoxy-coated benzocyclobutene

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

5 Scopus Citations
View graph of relations


Related Research Unit(s)


Original languageEnglish
Article number44601
Journal / PublicationOptical Engineering
Issue number4
Publication statusPublished - 2009


We propose a simple ultraviolet (UV) writing technique for the fabrication of buried waveguide devices, which employs a UV lamp as the light source and commercial benzocyclobutene (BCB) and epoxy OPTOCAST 3505 as the core and cladding materials, respectively. We show that the light emitted from the UV lamp can induce a large refractive-index change (up to 0.012) in BCB, while a negligible index change in the epoxy, which makes possible the writing of buried waveguide devices in BCB by exposing an epoxy-clad BCB film to the UV light through a mask. We demonstrate this technique experimentally with straight channel waveguides, Y-junction waveguide branches, and long-period waveguide gratings. The propagation loss of a typical fabricated waveguide is 1.6dB/cm at 1550nm and the polarization-dependent loss is 0.4dB/cm. © 2009 Society of Photo-Optical Instrumentation Engineers.

Research Area(s)

  • benzocyclobutene, integrated optics, long-period waveguide grating, optical waveguide fabrication, optical waveguide junction, OPTOCAST 3505, polymer waveguide, ultraviolet writing