Abstract

A novel, to the best of our knowledge, liquid crystal (LC) biosensor, based on an optical fiber Mach–Zehnder interferometer (MZI), is proposed. The proposed optical fiber MZI consists of two single-mode fibers and a tapered photonic crystal fiber (PCF). The PCF is coated with 4-pentyl-biphenyl-4-carboxylic acid (PBA)-doped 4-cyano-4-pentylbiphenyl (5CB). Being a pH-sensitive material, PBA can manipulate LC molecules to different orientations according to their pH values. When the orientation of LC molecules changes with varying pH, the effective refractive index of the cladding modes also is accordingly affected. Enzymatic reactions of penicillinase can release H+, which causes the decrease of the pH. Therefore, the enzymatic reactions of penicillinase can be sensed by monitoring the peak shift in the interference spectrum. The effects of the tapered diameter on the sensitivity of the sensor were experimentally investigated as well.

© 2019 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Real-time monitoring of the enzymatic reaction of urease by using whispering gallery mode lasing

Rui Duan, Yanzeng Li, Hanyang Li, and Jun Yang
Opt. Express 27(24) 35427-35436 (2019)

High-performance fiber sensor via Mach-Zehnder interferometer based on immersing exposed-core microstructure fiber in oriented liquid crystals

Yong Li, Lina Wang, Yuzhi Chen, Duo Yi, Fei Teng, Xueming Hong, Xuejin Li, Youfu Geng, Yue Shi, and Dan Luo
Opt. Express 28(3) 3576-3586 (2020)

Detection of heavy metal ions using whispering gallery mode lasing in functionalized liquid crystal microdroplets

Rui Duan, Yanzeng Li, Hanyang Li, and Jun Yang
Biomed. Opt. Express 10(12) 6073-6083 (2019)

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 (7)

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

Tables (1)

You do not have subscription access to this journal. Article tables 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

Equations (5)

You do not have subscription access to this journal. Equations 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