Thermal-structural modeling of polymer Bragg grating waveguides illuminated by a light emitting diode

Kyoung Joon Kim; Avram Bar-Cohen; Bongtae Han

doi:10.1364/AO.51.000726

Thermal-structural modeling of polymer Bragg grating waveguides illuminated by a light emitting diode

Appl Opt. 2012 Feb 20;51(6):726-34. doi: 10.1364/AO.51.000726.

Authors

Kyoung Joon Kim¹, Avram Bar-Cohen, Bongtae Han

Affiliation

¹ Department of Mechanical and Automotive Engineering, Pukyong National University, Busan, 608-739, South Korea. kjkim@pknu.ac.kr

PMID: 22358162
DOI: 10.1364/AO.51.000726

Abstract

This study reports both analytical and numerical thermal-structural models of polymer Bragg grating (PBG) waveguides illuminated by a light emitting diode (LED). A polymethyl methacrylate (PMMA) Bragg grating (BG) waveguide is chosen as an analysis vehicle to explore parametric effects of incident optical powers and substrate materials on the thermal-structural behavior of the BG. Analytical models are verified by comparing analytically predicted average excess temperatures, and thermally induced axial strains and stresses with numerical predictions. A parametric study demonstrates that the PMMA substrate induces more adverse effects, such as higher excess temperatures, complex axial temperature profiles, and greater and more complicated thermally induced strains in the BG compared with the Si substrate.