Abstract

We propose and demonstrate a novel temperature-insensitive bio-sensor for accurate and quantitative detection of Escherichia coli (E. coli) bacteria in water. Surface sensitivity is maximized by operating the long-period fiber grating (LPFG) closest to its turnaround wavelength, and the temperature insensitivity is achieved by selectively exciting a pair of cladding modes with opposite dispersion characteristics. Our sensor shows a nominal temperature sensitivity of 1.25  pm/°C, which can be further reduced by properly adjusting the LPFG lengths, while maintaining a high refractive index sensitivity of 1929 nm/RIU. The overall length of the sensor is 3.6  cm, making it ideally suitable for bio-sensing applications. As an example, we also show the sensor’s capability for reliable, quantitative detection of E. coli bacteria in water over a temperature fluctuation of room temperature to 40°C.

© 2016 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Label-free Gram-negative bacteria detection using bacteriophage-adhesin-coated long-period gratings

Ewa Brzozowska, Marcin Koba, Mateusz Śmietana, Sabina Górska, Monika Janik, Andrzej Gamian, and Wojtek J. Bock
Biomed. Opt. Express 7(3) 829-840 (2016)

Temperature-insensitivity gas pressure sensor based on inflated long period fiber grating inscribed in photonic crystal fiber

Xiaoyong Zhong, Yiping Wang, Changrui Liao, Shen Liu, Jian Tang, and Qiao Wang
Opt. Lett. 40(8) 1791-1794 (2015)

Detection of bacteria using bacteriophages as recognition elements immobilized on long-period fiber gratings

Mateusz Smietana, Wojtek J. Bock, Predrag Mikulic, Andy Ng, Raja Chinnappan, and Mohammed Zourob
Opt. Express 19(9) 7971-7978 (2011)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription