Theoretical and experimental investigations of metal sulfide dielectric coatings for hollow waveguides

M. Ben-David, M. Catalogna, I. Gannot, V. Gopal, J. Harrington

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Continues efforts to develop low loss flexible waveguides, to transmit mid IR laser energy for minimal invasive surgical and diagnostic procedures, have been carried out by us and other groups in this area. We have introduced sulfide dielectric films coated over an Ag reflecting layer as another potential solution. The metal sulfides used, have high transparency in the infra red spectrum and their thickness can be tailored to minimize the attenuation over a selected wavelength range. The high refractive index contrast of the two metal sulfide materials enable to produce multi layer hollow waveguides. These waveguide will have low attenuation in both straight and bent conditions, low sensitivity to coupling and to surface roughness and a broad wavelength range. The straight lowest loss measured at 1.55μm for a 1,000-μm bore Ag/CdS/PbS/CdS HGW was 0.06 dB/m. This loss is three times less than that measured for a single layer Ag/CdS coated HGW at 1.55μm. A theoretical simulation applying the same conditions showed the same pattern with a good potential for improvement.

Original languageEnglish
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
DOIs
StatePublished - 2006
EventOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications VI - San Jose, CA, United States
Duration: 21 Jan 200622 Jan 2006

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume6083
ISSN (Print)1605-7422

Conference

ConferenceOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications VI
Country/TerritoryUnited States
CitySan Jose, CA
Period21/01/0622/01/06

Keywords

  • Hollow waveguides
  • Photonic crystals

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