All-in-fibre Rayleigh-rejection filter for raman spectroscopy

Anna Chiara Brunetti, L. Scolari, T. Lund-Hansen, J. Weirich, Karsten Rottwitt

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An in-line Rayleigh-rejection filter for Raman spectroscopy is demonstrated. The device is based on a solid-core photonic crystal fibre infiltrated with a high-index liquid. At room temperature, the filter exhibits a full width at half maximum bandwidth of 143 nm and an insertion loss of 0.3 dB. A shift of 32 nm of the central wavelength is demonstrated by increasing the temperature from 22 to 70°C. FEM simulations of the spectra at different temperatures showed good agreement with experimental results. The device was successfully employed to perform Raman spectroscopy of a sample of cyclohexane and allowed for a fourfold attenuation of the Rayleigh scattered light.
Original languageEnglish
JournalElectronics Letters
Issue number5
Pages (from-to)275-276
Publication statusPublished - 2012


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