Journal
CHINESE OPTICS LETTERS
Volume 18, Issue 10, Pages -Publisher
OSA-OPTICAL SOC
DOI: 10.3788/COL202018.100601
Keywords
surface plasmon resonance; tilted fiber grating; biosensing
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Funding
- National Key R&D Program of China [2018YFB2100902]
- Science Fund for Creative Research Groups of the Natural Science Foundation of Hubei [2019AAA053, 2018CFA004]
- National Secretariat for Science, Technology and Innovation (SENACYT) of the Republic of Panama
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We proposed a hybrid tilted fiber gratings (polarizing grating and tilted fiber Bragg grating)-based surface plasmon resonance (SPR) sensor. The hybrid tilted fiber grating, consisting of a polarizing grating and tilted fiber Bragg grating (TFBG), is fabricated in a single-mode fiber in series by using a UV-inscription technique, in which the TFBG could generate a dense cladding mode resonance to excite SPR and the polarizing grating could filter out the S-polarization cladding mode of the TFBG. Such proposed hybrid tilted fiber gratings could greatly simplify the interrogation system of the TFBG-based SPR sensor. The experiment results showed that the hybrid tilted fiber gratings-based SPR sensor has the refractive index sensitivity of 522.8 nm/RIU. Finally, by using the proposed sensor, we have achieved the hemoglobin concentration detection within a sensing range from 0.1 mg/mL to 1.0 mg/mL and the sensitivity of 8.144 nm/(mg/mL).
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