Ultrasound detector and detecting device for optoacoustic or thermoacoustic imaging
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United States of America Patent
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Apr 24, 2018
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app pub date -
Feb 4, 2011
filing date -
Feb 4, 2011
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Abstract
An ultrasound detector adapted for ultrasound detection with medical applications includes an optical waveguide, and at least one Bragg grating, created with a predetermined refractive index modulation amplitude in the optical waveguide, wherein the at least one Bragg grating includes a localized defect in periodicity so that a localized-light resonance portion is formed around the defect, and the localized-light resonance portion has spectral properties capable of being modulated in response to an ultrasound oscillation, wherein the optical waveguide is a non-amplifying optical medium, and the refractive index modulation amplitude is selected such that the localized-light resonance portion is concentrated at the defect in periodicity and the ultrasound oscillation can be sensed by the at least one Bragg grating with an acoustic sensitivity most of which being obtained over the localized-light resonance portion.
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