Abstract
We present results of what are believed to be the first underwater acoustic sensor using an optical micro-knot resonator. The mechanism involves straining the micro-fibre loop of the knot via an appropriate encapsulation material. The micro-knot sensor exhibited a spectral fullwidth half-depth of 37.7pm with a Q-factor of 41100 after deconvolution with the source. The shift in wavelength at 1550nm was observed to be around 67pm RMS when exposed to underwater acoustic excitation at 40Hz demonstrating a normalized sensitivity of -288 dB re μPa-1, or 5.83 fm/Pa.
Original language | English |
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Pages (from-to) | 5850-5860 |
Number of pages | 11 |
Journal | Optics Express |
Volume | 23 |
Issue number | 5 |
DOIs | |
Publication status | Published - 9 Mar 2015 |