Abstract

In this paper, we numerically demonstrate a refraction index sensor based on phase resonance excitation in a subwavelength-slit structure with a double period. The sensor consists of a metal layer with subwavelength slots arranged in a bi-periodic form, separated from a high refraction index medium. Between the metallic structure and the incident medium, a dielectric waveguide is formed whose refraction index is going to be determined. Variations in the refraction index of the waveguide are detected as shifts in the peaks of transmitted intensity originated by resonant modes supported by the compound metallic structure. At normal incidence, the spectral position of these resonant peaks exhibits a linear or a quadratic dependence with the refraction index, which permits us to obtain the unknown refraction index value with a high precision for a wide range of wavelengths. Since the operating principle of the sensor is due to the morphological resonances of the slits’ structure, this device can be scaled to operate in different wavelength ranges while keeping similar characteristics.

© 2016 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Refractive index sensor based on multiple Fano resonances in a plasmonic MIM structure

Zhengfeng Li, Kunhua Wen, Li Chen, Liang Lei, Jinyun Zhou, Dongyue Zhou, Yihong Fang, and Bingye Wu
Appl. Opt. 58(18) 4878-4883 (2019)

Plasmonic filter and sensor based on a subwavelength end-coupled hexagonal resonator

Wenhui Lai, Kunhua Wen, Jiyan Lin, Zicong Guo, Qinyang Hu, and Yihong Fang
Appl. Opt. 57(22) 6369-6374 (2018)

Slow-light enhanced subwavelength plasmonic waveguide refractive index sensors

Yin Huang, Changjun Min, Pouya Dastmalchi, and Georgios Veronis
Opt. Express 23(11) 14922-14936 (2015)

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 (5)

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 (31)

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