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2015 ; 5
(ä): 17791
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Laser-tuned whispering gallery modes in a solid-core microstructured optical
fibre integrated with magnetic fluids
#MMPMID26632445
Lin W
; Zhang H
; Liu B
; Song B
; Li Y
; Yang C
; Liu Y
Sci Rep
2015[Dec]; 5
(ä): 17791
PMID26632445
show ga
A laser-assisted tuning method of whispering gallery modes (WGMs) in a
cylindrical microresonator based on magnetic-fluids-infiltrated microstructured
optical fibres (MFIMOFs, where MF and MOF respectively refer to magnetic fluid
and microstructured optical fibre) is proposed, experimentally demonstrated and
theoretically analysed in detail. The MFIMOF is prepared by infiltrating the
air-hole array of the MOF using capillary action effect. A fibre-coupling system
is set up for the proposed MFIMOF-based microresonator to acquire an extinction
ratio up to 25 dB and a Q-factor as large as 4.0 × 10(4). For the MF-infiltrated
MOF, the light propagating in the fibre core region would rapidly spread out and
would be absorbed by the MF-rod array cladding to induce significant thermal
effect. This has been exploited to achieve a WGM resonance wavelength sensitivity
of 0.034 nm/mW, which is ~20 times higher than it counterpart without MF
infiltration. The wavelength response of the resonance dips exhibit linear power
dependence, and owing to such desirable merits as ease of fabrication, high
sensitivity and laser-assisted tunability, the proposed optical tuning approach
of WGMs in the MFIMOF would find promising applications in the areas of optical
filtering, sensing, and signal processing, as well as future all-optical
networking systems.