A new method for accurately measuring temperature dependence of refractive index

Masahiro Tomiki, Naohiro Kurihara, Okihiro Sugihara, Naomichi Okamoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A new high-accuracy method for measuring temperature dependence of refractive index is proposed and applied to some polymer waveguides. The method uses 3 m-lines from a grating coupler on the waveguide surface, and has an accuracy of better than 1 × 10-5 (1/°C). The grating period dependent on the temperature does not affect the accuracy. The measurement thermo-optic (TO) coefficients of polycarbonate (PC) and polymethyl methacrylate (PMMA) are strongly dependent on the waveguide structure in contrast with the previously reported value. It is found that the TM-mode refractive index of UV-curing polymer (J-91) increases with the increase in temperature, contrary to common expectations for polymers. A highly efficient TO switch is expected using the J-91 polymer waveguide.

Original languageEnglish
Pages (from-to)97-100
Number of pages4
JournalOptical Review
Volume12
Issue number2
DOIs
Publication statusPublished - 2005 Mar 1

Keywords

  • Embossing
  • Grating coupler
  • Polymeric waveguide
  • Thermo-optic coefficient
  • m-line

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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