Lossy Mode Resonance Generation With Indium-Tin-Oxide-Coated Optical Fibers for Sensing Applications

Abstract

Surface plasmon resonances and lossy mode resonances can be generated with Indium Tin Oxide (ITO) coated optical fibers. Both phenomena are analyzed and compared. Lossy mode resonances present important advantages: they do not require a specific polarization of light, it is possible to generate multiple attenuation bands in the transmission spectrum, and the sensitivity of the device to external parameters can be tuned. The key parameter is the thickness of the ITO coating. The work is supported with both theoretical and experimental results. The main purposes are sensing and generation of multiple-wavelength filters.

Resonance-based refractometric response of cladding-removed optical fibers with sputtered indium tin oxide coatings

“…Taking advantage of LMRs it is even possible the generation of multiple resonance peaks as a function of the coating thickness and without modifying the optical fiber geometry [13]. Thus, an adequate selection of the thin-film to be deposited onto the optical fiber core will enable the fabrication of resonance-based optical fiber refractometers.…”

Optical fiber refractometers with response in the visible spectral region by means ITO coatings

“…Previously to the manufacture of ITO coating it is necessary to prepare the fiber using the procedure described in [7]. This process basically involves the removal of the cladding of plastic fiber along a length of 10 cm followed by a cleaning process using ultrasound.…”

“…These refractometers are based on a type of resonances that can be related with lossy modes and commonly are known as lossy mode resonances (LMRs), which have been described in several works [4,5]. LMRs, unlike the more familiar surface plasmon resonance (SPR) [6], have the advantage of being generated by both, TE and TM, light polarizations as well as allow the generation of more than one resonance without modifying the morphology of the fiber [7].…”

“…to produce homogeneous and repetitive coatings [1-3, [7][8]. In order to solve the problems mentioned above here it is presented an alternative approach.…”

Optical Fiber Humidity Sensor Based on Lossy Mode Resonances

“…A maximum in the absorption appears in the infra red region which is associated to the lossy mode resonance phenomenon [9]. This resonance peak shifts to higher wavelengths when the refractive index of the external medium rises.…”