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We propose a novel method for fabricating fused fiber couplers whose transmission spectrum and sensitivity can be controlled in the wet-etching process. A wide tuning of the transmission spectrum during wet etching was observed experimentally. It was demonstrated that etched fused fiber couplers with reduced waist size had high sensitivity to the refractive index of an external medium. The sensitivity...
The design and testing of optical sensors for a cello compatible with magnetic resonance imaging (MRI) are presented. The interface is used in neuroimaging experiments, allowing for the first time, the acquisition of cello performance gestures captured inside the MRI scanner. Left-hand fingering and right-hand bowing gestures were captured with optical sensors embedded in the fingerboard, bridge,...
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