Abstract

The film thickness sensing based on metamaterial is investigated in the terahertz (THz) region. We fabricated the metamaterial sensor, and demonstrated its resonance by using the THz time-domain spectroscopy system. The results show that the resonant dip redshifts as the film thickness increases, which achieves reliable film sensing in the THz band. Its sensitivity is larger than 9.4 GHz/μm with a film thinner than λ/90. Meanwhile, the sensing mechanism is revealed by the simulation of near-field resonance distribution, which shows that the resonant intensity is stronger when the field is closer to the interface between the metamaterial surface and polyvinyl alcohol film. Therefore, the nonlinear type of the sensing sensitivity in our experiment can be well explained, and a higher sensitive sensing can be obtained when the film thickness is smaller. This simple and flexible method can realize the ultrathin film sensing in the THz region, and has application potential in the real-time monitoring of sample quality.

© 2016 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Sub-diffraction thin-film sensing with planar terahertz metamaterials

Withawat Withayachumnankul, Hungyen Lin, Kazunori Serita, Charan M. Shah, Sharath Sriram, Madhu Bhaskaran, Masayoshi Tonouchi, Christophe Fumeaux, and Derek Abbott
Opt. Express 20(3) 3345-3352 (2012)

Hybrid terahertz plasmonic waveguide for sensing applications

Borwen You, Ja-Yu Lu, Tze-An Liu, and Jin-Long Peng
Opt. Express 21(18) 21087-21096 (2013)

Detection of deep-subwavelength dielectric layers at terahertz frequencies using semiconductor plasmonic resonators

Audrey Berrier, Pablo Albella, M. Ameen Poyli, Ronald Ulbricht, Mischa Bonn, Javier Aizpurua, and Jaime Gómez Rivas
Opt. Express 20(5) 5052-5060 (2012)

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

Equations (2)

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