In this work, is presented the fabrication and characterization of optical fiber refractometer based on lossy mode resonances (LMR). Indium-Tin-Oxide (ITO) thin films deposited on optical fibers are used as the LMR supporting coatings. These resonances shift to the red as a function of the external refractive index. The refractometer has been used to characterize temperature variations related to the viscosity of synthetic industrial gear lubricant.
Three different optical fiber refractometers based on lossy mode resonances (LMRs) have been fabricated by means of the deposition of indium oxide thin-films. The sensitivity of the devices as well as the full-width at half maximum (FWHM) has been characterized as a function of the surrounding medium refractive index (from 1.332 to 1.471. Obtained results revealed that thinner coating possess higher sensitivities. However, the FWHM is better for thicker coatings. As a general rule, the thicker the In2O3 coating the lower the sensitivity, but the better the FWHM. Thus, a compromise is required depending on the necessities of the application.
In this work, the fabrication and characterization of novel humidity sensors based on Lossy Mode Resonances (LMR) is presented. Tin oxide (SnO2) coatings fabricated onto optical fibers are used as LMR supporting coatings. The SnO2 based refractometers showed an average sensitivity of 6715 nm/refractive index unit (RIU) in the range 1.333–1.420 RIU. The behavior of this optical fiber device as relative humidity (RH) sensor was also tested, monitoring its response to different surrounding humidity levels. The results show a sensitivity of 0.1 nm/RH% in the range from 20% to 80% RH.
In this work, the fabrication and characterization of refractometers based on lossy mode resonances (LMR) is presented.
Tin dioxide (SnO2) films deposited on optical fibers are used as the LMR supporting coatings. These resonances shift to
the red as a function of the external refractive index, enabling the fabrication of robust and highly reproducible
wavelength-based optical fiber refractometers. The obtained SnO2-based refractometer shows an average sensitivity of
7198 nm/refractive index unit (RIU) in the range 1.333-1.420 RIU.
In this work, it is described the fabrication and characterization of optical fiber refractometers based on lossy-mode
resonances (LMR) originated by deposition of different thin-film coatings around the optical fiber core. Two devices
with different coating materials are compared: one coated with conducting tin doped indium oxide (ITO) coatings and
the other one coated with semiconducting indium oxide. The response of these devices is characterized and compared as
a function of the external refractive index. The sensitivity obtained for indium oxide based refractometers resulted 39%
higher than that of ITO based ones when the resonance is located in the same spectral region. This behaviour is attributed
to the spectral characteristics of indium oxide, which allow an earlier generation of the resonance thanks to its higher
refractive index as well as permitting the accomplishment of LMR conditions in a wider spectral range. Moreover, these
devices are an adequate platform for the development of a wide variety of sensors by the addition of the suitable layer
onto the transparent oxide coating.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.