Karakterizacija in kritično vrednotenje fluorimetrične sonde iz sedemjedrnega optičnega vlakna. (Slovenian)

Characterization and evaluation of a seven-core fiber-optic fluorometer probe. (English)

The purpose of this paper is to highlight the recent progress and trends in the development of leading-edge, fiber-optic probes that address the current challenges in the spectroscopybased biophotonics techniques, including fluorescence. In the fluorometer, a light source emits the excitation light and a detector senses the emitted light that is relevant to the biochemical media to be measured. After the invention of the optical fiber, the light guided into the media plays a crucial role in the fluorescence spectroscopy. In this paper we are looking at uses of multi-core fibers as a fluorometer fiber probe that pushes the current capabilities of sensing in biochemical environments. We describe the technology that is directly used for the fabrication of the multi-core fiber and motivated by the need for photonic signal processing, such as the filtration of optical signals. The stackand- draw process is used for the fabrication of a seven-core fiber. With seven cores we collect the emitted fluorescence, which is then guided into the central core and filtered by the frequency-dependent, multi-core fiber transfer function. The multi-core fiber, which acts as a filter, blocks other wavelengths, but transmits the wavelengths relevant to the biochemical media. A proper selection of the filter transmission function is crucial and requires familiarity with the emission and excitation spectrum. In our research we use several single-mode fiber - multicore fiber - single-mode fiber (SMS) structures, which differ in terms of their lengths. The seven-core fiber probe is characterized by using the computed and experimental transmission spectra. The results from numerical simulations of a 3D full-vectorial model are compared with 30, 40, 60 and 80 cm SMS samples in the third spectral window. The period and modulation depth of the simulations and measurements coincide exactly. The frequency shift observed in the transfer characteristics is a consequence of the inaccurate cutting of the seven-core fiber length that is part of the spliced SMS structure. [ABSTRACT FROM AUTHOR]

V delu je predlagana nova integrirana visokoučinkovita steklena sedem-jedrna vlakenska fluorometrična sonda. Zasnovana sonda inovativno združevanje funkciji zajema svetlobe in optičnega filtriranja s pomočjo presluhov v večjedrnem optičnem vlaknu. Za namene njene karakterizacije in kritičnega vrednotenja je bil razvit numerični model razširjanja svetlobe v večjedrni strukturi svetlovodov, ki omogoča optimizacijo valovno-snovnih lastnosti večjedrne vlakenske sonde za to biokemijsko aplikacijo. Rezultati, pridobljeni s simulacijami, so primerjani z meritvami prenosne karakteristike v tretjem spektralnem oknu in kažejo precejšnje ujemanje glede periode in modulacijske globine prenosne funkcije. Frekvenčni premik se pripisuje odstopanju v dolžini sedemjedrnega optičnega vlakna, ki je nastalo zaradi nenatančnega rezanja vzorca. [ABSTRACT FROM AUTHOR]

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