Abstract

In this paper, we present a dual-channel narrowband polarization absorber based on a metal-dielectric-metal structure, which consists of a top metallic nanorod array, a metal substrate, and an ultrathin middle dielectric spacer. The proposed structure can achieve high absorptance above 96% in a wide angular range of incidence around ±20° at two remarkable absorption peaks for transverse magnetic polarization under normal incidence. Most significantly, the extremely highly confined enhancement of electromagnetic fields between Au film and nanorods has been observed by employing numerical simulation based on a finite element method, which is up to 110 times compared with the incident electric field. The underlying physics mechanism of a strong gap plasmon resonance is analyzed, and it is primarily attributed to simultaneous excitation of multiple localized electric dipole and magnetic dipole resonance modes in this film-coupled nanorods system. Additionally, we also investigate the dependence of dual resonance peaks on structural parameters as well as their sensitivities to the refractive index of media surrounding nanorods. The wavelength modulation and intensity modulation are also shown simultaneously. This structure is near-perfect absorbing, plasmonic refractive index sensing, and surface-enhanced Raman spectroscopy, all rolled into one. It will have great significance and potential in developing new miniaturized multifunctional photonics devices and their high integrations.

© 2018 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Multispectral near-perfect metamaterial absorbers using spatially multiplexed plasmon resonance metal square structures

Boyang Zhang, Joshua Hendrickson, and Junpeng Guo
J. Opt. Soc. Am. B 30(3) 656-662 (2013)

Wide-angle, polarization-independent and dual-band infrared perfect absorber based on L-shaped metamaterial

Yang Bai, Li Zhao, Dongquan Ju, Yongyuan Jiang, and Linhua Liu
Opt. Express 23(7) 8670-8680 (2015)

Polarization-independent dual-band infrared perfect absorber based on a metal-dielectric-metal elliptical nanodisk array

Bingxin Zhang, Yanhui Zhao, Qingzhen Hao, Brian Kiraly, Iam-Choon Khoo, Shufen Chen, and Tony Jun Huang
Opt. Express 19(16) 15221-15228 (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 (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 (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