Abstract

We demonstrate here an extremely simple, compact, and robust refractive index (RI) probe sensor based on a femtosecond-laser induced refractive index-modified dot (RIMD) fabricated near the end face of a single-mode fiber. The RIMD and the fiber end face form a Fabry–Perot interferometer, which is highly sensitive to surrounding RI. The fabrication process of the RIMD involves only one step and takes 0.1  s, which is extremely short, compared with other techniques. The proposed sensor exhibits an ultra-high sensitivity of 2523.2  dB/RIU at an RI of 1.435, which is one to two orders of magnitude higher than that of the existing intensity-modulated RI sensors. Moreover, the proposed sensor has the distinct advantages of compact size (50  μm), easy fabrication, and no temperature cross-sensitivity. The advantages of the device make it a promising candidate for applications in designing highly sensitive sensors in a biochemical and environmental measurement field.

© 2017 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles

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

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 (3)

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