STUDY OF PLASMON RESONANCE IN COPPER FILMDEPOSITED ON OPTICAL FIBER WITH TILTED FIBER BRAGG GRATING

 

I. A. Nechepurenko ^1,2, A. V. Dorofeenko ^1,2,3, K. A. Tomyshev ⁴, O. V. Butov⁴

¹All-Russia Research Institute of Automatics, Moscow, Russia

² Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russia

³ Institute for Theoretical and Applied Electromagnetics RAS, Moscow, Russia

⁴ Institute of Radioengineering and Electronics RAS, Moscow, Russia

 

The paper is received on April 1, 2015

 

Abstract. A method of surface plasmon resonance excitation in a copper film deposited onto a lateral surface of fiber, which contains a tilted fiber Bragg grating in its core, is realized experimentally. A reason for disappearance of distinct plasmon resonance is determined. It is shown that within some hours after the film deposition plasmon resonance is subject to redshift, accompanied by broadening, which leads to the resonance evanescence. These effects are in good agreement with calculation, which takes the copper degradation into account. A characteristic lifetime of the copper film is found.

Keywords: plasmonic optical fiber sensor of refractive index, tilted fiber Bragg grating, fiber cladding modes.