Using an optimized high index ITO overlay on a single resonant band LPG to enhance the tunable range while maintaining the resonant peak depth

J. Lee, Q. Chen, Qiming Zhang, Karl Martin Reichard, D. Ditto, J. Mazurowski, M. Hackert, Shizhuo Yin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, we report laboratory test results of an LPG that can maintain a constant resonant peak depth over an enhanced tuning range when it is coated with an ITO electrode that has optimized thickness and refractive index. Without the ITO layer, LPG tuning ranges as large as 50 nm have been achieved when the ambient index is increased from 1.00 (air) to ∼1.444 (index of the silica cladding), but the peak depth cannot be maintained. When a properly designed, high-index ITO overlay is coated onto the silica cladding, mode transition effects coincide with the LPG' s intrinsic sensitivity to changes in the ambient index, resulting in a stable peak depth over an enhanced tuning range. The authors have experimentally demonstrated an LPG coated with ITO that can be tuned in excess of 150 nm with an ambient refractive index change of less than 0.01. To the best of the authors' knowledge, this is the highest sensitivity reported for an LPG to date. In addition to the tuning performance, the resonant peak remains within 1 dB of its maximum depth for at least 100 nm of the tuning range, which allows the tunable LPG to be used in real applications.

Original languageEnglish (US)
Title of host publicationPhotonic Fiber and Crystal Devices
Subtitle of host publicationAdvances in Materials and Innovations in Device Applications
DOIs
StatePublished - Dec 1 2007
EventPhotonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications - San Diego, CA, United States
Duration: Aug 26 2007Aug 27 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6698
ISSN (Print)0277-786X

Other

OtherPhotonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications
CountryUnited States
CitySan Diego, CA
Period8/26/078/27/07

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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