Tin-diffused glass slab waveguides locally covered with tapered thin TiO2 films for application as a polarimetric interference sensor with an improved performance

Zhi Mei Qi, Itaru Honma, Haoshen Zhou

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Common soda lime slide glass substrates made by floating molten glass on the surface of molten tin contain a tin-diffused layer that is demonstrated to be a low-loss polarization-insensitive slab optical waveguide. In this study, such a tin-diffused waveguide was locally covered with a tapered thin TiO 2 film to form a composite structure in which the zeroth-order transverse electric (TE0) and magnetic (TM0) modes are spatially separated from each other. This feature enables the composite structure to serve as a highly sensitive polarimetric interferometer. Moreover, a negligible modal birefringence of tin-diffused waveguides offers the polarimetric interferometer an improved performance relative to those fabricated earlier using single-mode potassium ion-exchanged glass waveguides. In situ detection of both the protein adsorption and a small change in refractive index of liquid was accomplished using the tin-diffused waveguide-based polarimetric interferometer. With horse heart myoglobin, adsorption from aqueous solution less than 0.125 monolayer coverage can cause the interferometer to yield a phase-difference change Δφ = 2π.

Original languageEnglish
Pages (from-to)1163-1166
Number of pages4
JournalAnalytical Chemistry
Volume77
Issue number4
DOIs
Publication statusPublished - 2005 Feb 15
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry

Fingerprint Dive into the research topics of 'Tin-diffused glass slab waveguides locally covered with tapered thin TiO<sub>2</sub> films for application as a polarimetric interference sensor with an improved performance'. Together they form a unique fingerprint.

Cite this