Abstract
The interaction of the adiabatically tapered photonic crystal fiber fundamental mode with a thin-film absorbing coating, deposited on a surface of a taper waist, on transmission of a tapered fiber is studied. Examples of using this interaction in refractive index sensors and for detection of an adsorption layer with ammonia molecules upon contact of the absorbing coating with a liquid medium are presented. It is obtained that a pronounced sensory effect occurs in the case of a resonant coupling between the fundamental fiber mode and cladding modes localized between photonic crystal fiber air channels and the absorbing coating.
Highlights
It is known that the fundamental mode of an index guiding photonic-crystal fiber (PCF) can be resonance coupled with leaky modes of a thin film PCF coating [1]
It is hoped that the use of adiabatic PCF tapers with a length of a sensitive region of a centimeter order will overcome these difficulties
Corresponding estimates are presented for transmission spectra T(λ) of PCF tapers at sensing the refractive index of a liquid, and for detection of an adsorption molecular layer
Summary
It is known that the fundamental mode of an index guiding photonic-crystal fiber (PCF) can be resonance coupled with leaky modes of a thin film PCF coating (cover) [1]. Where λ is the light wavelength, nc and ns are refractive indexes of the coating and a fiber cladding, respectively [1].
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