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- W2159404843 abstract "We report on the fabrication of two different Fabry-Perot optical resonators on the endface of a SMF28 fibre, by employing Direct Laser Writing by multi-photon polymerization [1, 2]. We explore these endface fibre sensing probes for tracing common organic solvents [3]. The devices developed have been optimised for operation at the spectral region lying between 1415nm to1655nm, while being interrogated in reflection mode using a simple 50/50 fibre coupler. The laser used was a Ti:sapphire unit emitting at 800nm, 200fs pulses at a repetition rate of 50–80 MHz. The beam projection system was based on an inverse microscope; beam steering was performed using a x–y galvanometric mirror scanning the beam through a high magnification objective. Lateral resolution was of the order of 250nm [1]. The material that used for the fabrication of the endface microstructures is a zirconium-silicon, organic-inorganic hybrid photosensitive material [4]. The first microstructure consists of a thin, flat membrane suspended on four pillars attached onto the silica fibre endface (Fig. 1a). This architecture allows the formation of a small air cavity between the end face of the fibre and the suspended thin membrane, which acts as a multilayer Fabry-Perot resonator, providing interrogation capabilities of the media inside the air cavity section; or attached on the membrane endface [5]. Liquid or gaseous media can be trapped between the empty gap of the microdrum resonator, detecting refractive index or absorption changes in reflection mode. The specific cavity demonstrated herein consists of a 14.4um air gap formed between the fibre endface and the photopolymerised structure, while the membrane thickness is 10.4um , resulting in the periodic modulation of the reflected optical spectrum by notches of ~29dB in amplitude strength with a free spectral range of ~87nm." @default.
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- W2159404843 date "2013-01-01" @default.
- W2159404843 modified "2023-09-27" @default.
- W2159404843 title "Fabry-Perot Vapor Microsensors Fabricated onto Fibre Endface by Multiphoton Polymerization Technique" @default.
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- W2159404843 doi "https://doi.org/10.1051/matecconf/20130805006" @default.
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