Abstract
Ultrasound detection is performed by measuring laser reflection off a surface plasmon resonance cavity which is integrated at a single-mode fiber end facet. It shows a total noise (or laser RIN) equivalent pressure of 9.7KPa (or 5.2KPa) over 0-20MHz, a 6-dB angular detection range as large as 70° near 10MHz, a detection bandwidth larger than 125MHz, and a stable performance for over 20min without feedback in ambient conditions. Its small form factor, fiber-optic integration, almost omnidirectional responsivity and large bandwidth are favorable for in vivo applications and high resolution imaging.
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