Sensing characteristics of structural microfiber long-period gratings.
Opt Express
; 31(22): 36202-36208, 2023 Oct 23.
Article
in En
| MEDLINE
| ID: mdl-38017774
ABSTRACT
We present a detailed investigation into the sensing characteristics of a structural microfiber long-period grating (mLPG) sensor. By spirally winding a thinner microfiber to another thicker microfiber, periodic refractive index modulation is formed while the optical signal transmitted in the thicker microfiber is resonantly coupled out to the thinner microfiber, and then a 5-period four-port mLPG can be obtained with a device length of only â¼570â
µm demonstrated a strong resonant dip of 25â
dB. We studied the sensitivity characteristics of the four-port mLPG with surrounding strain, force, temperature and refractive index, and the obtained sensitivities were -6.4 pm/µÉ, -8418.6â
nm/N, 7.62 pm/°C and 2122â
nm/RIU, respectively. With the advantages of high refractive index sensitivity and wide wavelength tunable range, the four-port mLPG has great potential in applications such as tunable filters and biochemical sensor.
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MEDLINE
Language:
En
Year:
2023
Type:
Article