Article

Demonstration of a compact temperature sensor based on first-order Bragg grating in a tapered fiber probe.

College of Engineering and Applied Sciences and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, China.
Optics Express (impact factor: 3.59). 09/2011; 19(19):18452-7. pp.18452-7
Source: PubMed

ABSTRACT We experimentally demonstrate an all-silica first-order fiber Bragg grating (FBG) for high temperature sensing by focused ion beam (FIB) machining in a fiber probe tapered to a point. This 61-period FBG is compact (~36.6 μm long and ~6.5 μm in diameter) with 200-nm-deep shallow grooves. We have tested the sensor from room temperature to around 500 °C and it shows a temperature sensitivity of nearly 20 pm/°C near the resonant wavelength of 1550 nm. This kind of sensor takes up little space because of its unique geometry and small size and may be integrated in devices that work in harsh environment or for detecting small objects.

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Keywords

200-nm-deep shallow grooves
 
61-period FBG
 
all-silica first-order fiber Bragg grating
 
detecting small objects
 
fiber probe tapered
 
harsh environment
 
ion beam
 
resonant wavelength
 
sensor
 
small size
 
unique geometry