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Vibration sensor consisting of a waveguide written across three pieces of glass. The suspended beam supporting the central piece of glass is made of borosilicate glass; the rest of the sensor is made of soda-lime glass. The sample is translated at with respect to the microscope objective.
Transmission optical microscope image of the embedded waveguide near the wide gap (dashed lines) between two pieces of glass. The gap is not visible because it is filled with index-matching oil. Although the waveguide is interrupted over a distance of , it is optically continuous.
Waveguide loss dependence on lateral offset. Circles: experimental data; dashed line: fit to theory.
Power spectrum of sensor response to a 100-Hz acoustic signal. The power spectrum is obtained by taking the Fourier transform of the time domain response (inset).
Frequency response of the sensor at 293 K (solid line) and 343 K (dotted line).
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