Microfiber Knot With Taper Interferometer for Temperature and Refractive Index Discrimination

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Gomes, AD (Author) Other; Frazao, O (Author) FCUP

Journal

Title: IEEE Photonics Technology Letters

Vol. 29

Pages: 1517-1520

ISSN: 1041-1135

Publisher: IEEE

Indexing

ISI Web of Knowledge - 13 Citations

Scopus - 17 Citations

Other information

Authenticus ID: P-00M-YSN

DOI: 10.1109/lpt.2017.2735185

Abstract (EN): A compact sensing structure using two distinct optical devices, a microfiber knot resonator and an abrupt taper-based Mach-Zehnder interferometer (MZI), is presented. The device was fabricated using only CO2 laser processing. The transmission spectrum presents two different components with different sensitivities to different physical and chemical parameters. The sensor was characterized in temperature and refractive index. For temperature sensing in water, the MZI component presents a sensitivity of -196 +/- 2 pm/degrees C while the microfiber knot resonator (MKR) component shows a sensitivity of 25.1 +/- 0.9 pm/degrees C, for water temperature variations of 12 degrees C. Sensitivities of 1354 +/- 14 nm/RIU and -43 +/- 4 nm/RIU were achieved for refractive index sensing for the MZI and the MKR components, respectively, in a refractive index range from 1.32823 to 1.33001. The matrix method was used for the simultaneous measurement of temperature and refractive index.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4