Ms. Surbhi Gupta Profile

Surbhi Gupta

Ph.D. Research Scholar

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Proceedings Article | 31 August 2017 Paper

Surface plasmon resonance based electro-optic measurement of SBN thin films

Surbhi Gupta, Ayushi Paliwal, Vinay Gupta, Monika Tomar

Proceedings Volume 10354, 103540S (2017) https://doi.org/10.1117/12.2273155

KEYWORDS: Surface plasmons, Electro optics, Thin films, Refractive index, Pulsed laser deposition, Reflectivity, Optical properties, Modulators

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Strontium Barium Niobate (SBN) has been known for its highest electro optic coefficient amongst the known photorefractive materials. SBN thin films were prepared using Pulsed Laser Deposition (PLD) technique on the conducting LSCO coated Si Substrate and its tetragonal tungsten bronze structure was confirmed using X-ray diffraction technique. Surface Plasmon Resonance (SPR) technique has been effectively used by exploiting the SBN thin film in Otto configuration using prism coupling technique. The SPR reflectance curves for prism/air-gap/gold/SBN/LSCO/Si system were obtained by varying the applied electric field from 0 to 150kV/cm. A continuous increase in minimum reflectance of SPR curves with increase in the electric field across the SBN thin film has been obtained indicating variation in optical properties of SBN thin film on application of electric field. This increase in reflectance was attributed to the change in propagation constant of wave vector due to the change of optical properties of the film under consideration. The resonance condition changes hence the SPR minimum reflectance angle and position changes.

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